TriCo Bancshares (TCBK) 10-Q 8 Nov 13 2013 Q3 Quarterly report Financial data

Document_and_Entity_Informatio

Document and Entity Information	9 Months Ended
	Sep. 30, 2013	Nov. 01, 2013
Document And Entity Information [Abstract]	'	'
Document Type	'10-Q	'
Amendment Flag	'false	'
Document Period End Date	30-Sep-13	'
Document Fiscal Year Focus	'2013	'
Document Fiscal Period Focus	'Q3	'
Trading Symbol	'TCBK	'
Entity Registrant Name	'TRICO BANCSHARES /	'
Entity Central Index Key	'0000356171	'
Current Fiscal Year End Date	'--12-31	'
Entity Filer Category	'Accelerated Filer	'
Entity Common Stock, Shares Outstanding	'	16,076,662

Condensed_Consolidated_Balance

Condensed Consolidated Balance Sheets (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Assets:	'	'
Cash and due from banks	$69,173	$81,086
Cash at Federal Reserve and other banks	471,977	667,813
Cash and cash equivalents	541,150	748,899
Investment securities:	'	'
Available for sale	115,215	163,027
Held to maturity	193,262	0
Restricted equity securities	9,163	9,647
Loans held for sale	3,247	12,053
Loans	1,657,051	1,564,823
Allowance for loan losses	-39,340	-42,648
Total loans, net	1,617,711	1,522,175
Foreclosed assets, net	4,140	7,498
Premises and equipment, net	31,246	26,985
Cash value of life insurance	51,919	50,582
Accrued interest receivable	6,450	6,636
Goodwill	15,519	15,519
Other intangible assets, net	935	1,092
Mortgage servicing rights	6,049	4,552
Indemnification asset	861	1,997
Other assets	35,239	38,607
Total assets	2,632,106	2,609,269
Deposits:	'	'
Noninterest-bearing demand	656,266	684,833
Interest-bearing	1,637,045	1,604,869
Total deposits	2,293,311	2,289,702
Accrued interest payable	937	1,036
Reserve for unfunded commitments	2,875	3,615
Other liabilities	33,667	35,122
Other borrowings	14,626	9,197
Junior subordinated debt	41,238	41,238
Total liabilities	2,386,654	2,379,910
Commitments and contingencies (Note 18)	'	'
Shareholders' equity:	'	'
Common stock, no par value: 50,000,000 shares authorized; issued and outstanding: 16,076,662 at September 30, 2013 16,000,838 at December 31, 2012	89,054	85,561
Retained earnings	156,266	141,639
Accumulated other comprehensive income, net of tax	132	2,159
Total shareholders' equity	245,452	229,359
Total liabilities and shareholders' equity	$2,632,106	$2,609,269

Condensed_Consolidated_Balance1

Condensed Consolidated Balance Sheets (Parenthetical) (USD $)	Sep. 30, 2013	Dec. 31, 2012	Aug. 21, 2007
Statement Of Financial Position [Abstract]	'	'	'
Common stock, no par value	'	'	'
Common stock, shares authorized	50,000,000	50,000,000	'
Common stock, shares issued	16,076,662	16,000,838	'
Common stock, shares outstanding	16,076,662	16,000,838	15,814,662

Condensed_Consolidated_Stateme

Condensed Consolidated Statements of Income (USD $)	3 Months Ended		9 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Interest and dividend income:	'	'	'	'
Loans, including fees	$25,123	$25,530	$73,078	$76,251
Debt securities:	'	'	'	'
Taxable	1,742	1,443	4,022	4,790
Tax exempt	172	108	423	323
Dividends	121	12	257	39
Interest bearing cash at Federal Reserve and other banks	378	372	1,318	1,170
Total interest and dividend income	27,536	27,465	79,098	82,573
Interest expense:	'	'	'	'
Deposits	854	1,106	2,634	3,367
Other borrowings	1	395	3	1,602
Junior subordinated debt	314	333	936	1,003
Total interest expense	1,169	1,834	3,573	5,972
Net interest income	26,367	25,631	75,525	76,601
(Benefit from) provision for loan losses	-393	532	-887	7,899
Net interest income after provision for loan losses	26,760	25,099	76,412	68,702
Noninterest income:	'	'	'	'
Service charges and fees	6,662	5,783	19,284	17,890
Gain on sale of loans	1,083	1,430	4,967	4,317
Commissions on sale of non-deposit investment products	692	803	2,294	2,464
Increase in cash value of life insurance	531	450	1,337	1,350
Other	159	661	1,594	1,948
Total noninterest income	9,127	9,127	29,476	27,969
Noninterest expense:	'	'	'	'
Salaries and related benefits	12,861	12,362	38,712	37,614
Other	10,755	13,228	30,014	35,258
Total noninterest expense	23,616	25,590	68,726	72,872
Income before income taxes	12,271	8,636	37,162	23,799
Provision for income taxes	4,910	3,616	14,999	9,527
Net income	$7,361	$5,020	$22,163	$14,272
Earnings per share:	'	'	'	'
Basic	$0.46	$0.31	$1.38	$0.89
Diluted	$0.45	$0.31	$1.37	$0.89

Condensed_Consolidated_Stateme1

Condensed Consolidated Statements of Comprehensive Income (USD $)	3 Months Ended								9 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Sep. 30, 2013	Sep. 30, 2012
Statement Of Income And Comprehensive Income [Abstract]	'	'	'	'	'	'	'	'	'	'
Net income	'	$7,361	$6,325	$8,477	$4,722	$5,020	$5,321	$3,931	$22,163	$14,272
Other comprehensive income (loss), net of tax:	'	'	'	'	'	'	'	'	'	'
Unrealized holding gains (losses) on securities arising during the period	'	83	'	'	'	98	'	'	-2,027	-176
Other comprehensive income (loss)	'	83	'	'	'	98	'	'	-2,027	-176
Comprehensive income	'	$7,444	'	'	'	$5,118	'	'	$20,136	$14,096

Condensed_Consolidated_Stateme2

Condensed Consolidated Statements of Changes in Shareholders' Equity (USD $)	Total	Common Stock [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income [Member]
In Thousands, except Share data
Beginning balance at Dec. 31, 2011	$216,441	$84,079	$128,551	$3,811
Beginning balance, shares at Dec. 31, 2011	'	15,978,958	'	'
Net income	14,272	'	14,272	'
Other comprehensive loss	-176	'	'	-176
Stock option expense	800	800	'	'
Stock options exercised	204	204	'	'
Stock options exercised, shares	'	17,000	'	'
Tax benefit of stock options exercised	21	21	'	'
Repurchase of common stock, value	-48	-16	-32	'
Repurchase of common stock, shares	'	-3,065	'	'
Dividends paid ($0.31 and $0.27 per share for nine months ended September 30 2013 & 2012 respectively)	-4,317	'	-4,317	'
Ending balance at Sep. 30, 2012	227,197	85,088	138,474	3,635
Ending balance, shares at Sep. 30, 2012	'	15,992,893	'	'
Beginning balance at Dec. 31, 2012	229,359	85,561	141,639	2,159
Beginning balance, shares at Dec. 31, 2012	16,000,838	16,000,838	'	'
Net income	22,163	'	22,163	'
Other comprehensive loss	-2,027	'	'	-2,027
Stock option vesting	849	849	'	'
Stock option forfeiture	-22	-22	'	'
Stock options exercised	3,240	3,240	'	'
Stock options exercised, shares	'	248,765	'	'
Tax benefit of stock options exercised	356	356	'	'
Repurchase of common stock, value	-3,490	-930	-2,560	'
Repurchase of common stock, shares	'	-172,941	'	'
Dividends paid ($0.31 and $0.27 per share for nine months ended September 30 2013 & 2012 respectively)	-4,976	'	-4,976	'
Ending balance at Sep. 30, 2013	$245,452	$89,054	$156,266	$132
Ending balance, shares at Sep. 30, 2013	16,076,662	16,076,662	'	'

Condensed_Consolidated_Stateme3

Condensed Consolidated Statements of Changes in Shareholders' Equity (Parenthetical) (USD $)	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Dividends paid, per share	$0.31	$0.27
Retained Earnings [Member]	'	'
Dividends paid, per share	$0.31	$0.27

Condensed_Consolidated_Stateme4

Condensed Consolidated Statements of Cash Flows (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012
Operating activities:	'	'
Net income	$22,163	$14,272
Adjustments to reconcile net income to net cash provided by operating activities:	'	'
Depreciation of premises and equipment, and amortization	3,229	3,221
Amortization of intangible assets	157	157
(Benefit from) provision for loan losses	-887	7,899
Amortization of investment securities premium, net	597	907
Originations of loans for resale	-123,834	-162,082
Proceeds from sale of loans originated for resale	136,421	160,286
Gain on sale of loans	-4,967	-4,317
Change in market value of mortgage servicing rights	-311	1,513
Provision for losses on foreclosed assets	620	1,520
Gain on sale of foreclosed assets	-1,479	-364
Loss on disposal of fixed assets	12	404
Increase in cash value of life insurance	-1,337	-1,350
Gain on life insurance death benefit	'	-600
Stock option vesting expense	849	800
Stock option excess tax benefits	-356	-21
Change in:	'	'
Interest receivable	186	-326
Interest payable	-99	-535
Reserve for unfunded commitments	-740	-185
Other assets and liabilities, net	3,408	9,563
Net cash from operating activities	33,632	30,762
Investing activities:	'	'
Proceeds from maturities of investment securities available for sale	43,768	58,395
Purchases of investment securities available for sale	'	-13,815
Proceeds from maturities of investment securities held to maturity	1,629	'
Purchases of investment securities held to maturity	-194,942	'
Redemption of restricted equity securities, net	484	963
Loan principal (increases) decreases, net	-39,986	-40,098
Loans purchased	-62,698	'
Proceeds from sale of foreclosed assets	12,252	11,281
Improvements of foreclosed assets	'	-474
Proceeds from sale of premises and equipment	9	33
Purchases of premises and equipment	-6,771	-7,077
Life insurance proceeds	706	1,611
Net cash (used in) provided from investing activities	-245,549	10,819
Financing activities:	'	'
Net increase in deposits	3,609	11,103
Net change in other borrowings	5,429	-63,277
Stock option excess tax benefits	356	21
Repurchase of common stock	-501	-48
Dividends paid	-4,976	-4,317
Exercise of stock options	251	156
Net cash provided (used) in financing activities	4,168	-56,362
Net change in cash and cash equivalents	-207,749	-14,781
Cash and cash equivalents at beginning of period	748,899	637,275
Cash and cash equivalents at end of period	541,150	622,494
Supplemental disclosure of noncash activities:	'	'
Loans transferred to other real estate owned	8,035	5,816
Change in unrealized net gain on securities available for sale	-3,498	-304
Market value of shares tendered by employees in-lieu of cash to pay for exercise options and/or related taxes	3,490	48
Supplemental disclosure of cash flow activity:	'	'
Cash paid for interest expense	3,672	6,507
Cash paid for income taxes	$15,110	$7,320

Summary_of_Significant_Account

Summary of Significant Accounting Policies	9 Months Ended
	Sep. 30, 2013
Accounting Policies [Abstract]	'
Summary of Significant Accounting Policies	'
	Note 1 – Summary of Significant Accounting Policies
	Description of Business
	TriCo Bancshares is a California corporation organized to act as a bank holding company for Tri Counties Bank (the “Bank”). The Bank is a state-chartered financial institution that is engaged in the general commercial banking business in the California counties of Butte, Contra Costa, Del Norte, Fresno, Glenn, Kern, Lake, Lassen, Madera, Mendocino, Merced, Napa, Nevada, Placer, Sacramento, Shasta, Siskiyou, Stanislaus, Sutter, Tehama, Tulare, Yolo and Yuba. Tri Counties Bank currently operates from 41 traditional branches and 24 in-store branches. The Company also formed two subsidiary business trusts, TriCo Capital Trust I and TriCo Capital Trust II (collectively, the Trusts), to issue trust preferred securities.
	Basis of Presentation
	The following unaudited condensed financial statements of the Company have been prepared pursuant to the rules and regulations of the Securities and Exchange Commission. Certain information and note disclosures normally included in annual financial statements prepared in accordance with generally accepted accounting principles have been condensed or omitted pursuant to those rules and regulations, although the Company believes that the disclosures made are adequate to make the information not misleading. In the opinion of Management, all adjustments, consisting solely of normal recurring adjustments, considered necessary for a fair presentation of results for the interim periods presented have been included. These interim condensed consolidated financial statements should be read in conjunction with the financial statements and related notes contained in the Company’s 2012 Annual Report on Form 10-K filed with the Securities and Exchange Commission on March 18, 2013.
	The condensed consolidated financial statements include the accounts of the Company and its wholly-owned financial subsidiary, Tri Counties Bank. All significant intercompany balances and transactions have been eliminated. TriCo Capital Trust I and TriCo Capital Trust II, which were formed solely for the purpose of issuing trust preferred securities, are unconsolidated subsidiaries as the Company is not the primary beneficiary of the trusts and they are not considered variable interest entities. Operating results for the three and nine months ended September 30, 2013 are not necessarily indicative of the results that may be expected for the year ending December 31, 2013. Certain amounts in the consolidated financial statements for the year ended December 31, 2012 and for the three and nine months ended September 30, 2012 may have been reclassified to conform to the presentation of the condensed consolidated financial statements in 2013.
	Use of Estimates in the Preparation of Financial Statements
	The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America requires Management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. On an on-going basis, the Company evaluates its estimates, including those related to the adequacy of the allowance for loan losses, investments, intangible assets, income taxes and contingencies. The Company bases its estimates on historical experience and on various other assumptions that are believed to be reasonable under the circumstances, the results of which form the basis for making judgments about the carrying values of assets and liabilities that are not readily apparent from other sources. Actual results may differ from these estimates under different assumptions or conditions. The allowance for loan losses, indemnification asset, foreclosed assets, goodwill and other intangible assets, income taxes, fair value of assets acquired and liabilities assumed in business combinations, the valuation of securities available-for-sale, and the valuation of mortgage servicing rights are the only accounting estimates that materially affect the Company’s consolidated financial statements.
	As described in Note 2, the Bank assumed the banking operations of two failed financial institutions from the FDIC under whole bank purchase agreements. The acquired assets and assumed liabilities were measured at estimated fair value values under the acquisition method of accounting. The Company made significant estimates and exercised significant judgment in accounting for the acquisitions. The Company determined loan fair values based on loan file reviews, loan risk ratings, appraised collateral values, expected cash flows and historical loss factors. Foreclosed assets were primarily valued based on appraised values of the repossessed loan collateral. An identifiable intangible was also recorded representing the fair value of the core deposit customer base based on an evaluation of the cost of such deposits relative to alternative funding sources. The fair value of time deposits and borrowings were determined based on the present value of estimated future cash flows using current rates as of the acquisition date.
	Significant Group Concentration of Credit Risk
	The Company grants agribusiness, commercial, consumer, and residential loans to customers located throughout the northern San Joaquin Valley, the Sacramento Valley and northern mountain regions of California. The Company has a diversified loan portfolio within the business segments located in this geographical area. The Company currently classifies all its operation into one business segment that it denotes as community banking.
	Cash and Cash Equivalents
	For purposes of the consolidated statements of cash flows, cash and cash equivalents include cash on hand, amounts due from banks, and federal funds sold. Net cash flows are reported for loan and deposit transactions and other borrowings.
	Investment Securities
	The Company classifies its debt and marketable equity securities into one of three categories: trading, available for sale or held to maturity. Trading securities are bought and held principally for the purpose of selling in the near term. Held to maturity securities are those securities which the Company has the ability and intent to hold until maturity. These securities are carried at cost adjusted for amortization of premium and accretion of discount, computed by the effective interest method over their contractual lives. All other securities not included in trading or held to maturity are classified as available for sale. Available for sale securities are recorded at fair value. Unrealized gains and losses, net of the related tax effect, on available for sale securities are reported as a separate component of other accumulated comprehensive income in shareholders’ equity until realized. Premiums and discounts are amortized or accreted over the life of the related investment security as an adjustment to yield using the effective interest method. Dividend and interest income are recognized when earned. Realized gains and losses are derived from the amortized cost of the security sold. During the nine months ended September 30, 2013, and the year ended December 31, 2012, the Company did not have any securities classified as trading. During the three months ended March 31, 2013, and the year ended December 31, 2012, the Company did not have any securities classified as held to maturity.
	The Company assesses other-than-temporary impairment (“OTTI”) based on whether it intends to sell a security or if it is likely that the Company would be required to sell the security before recovery of the amortized cost basis of the investment, which may be maturity. For debt securities, if we intend to sell the security or it is likely that we will be required to sell the security before recovering its cost basis, the entire impairment loss would be recognized in earnings as an OTTI. If we do not intend to sell the security and it is not likely that we will be required to sell the security but we do not expect to recover the entire amortized cost basis of the security, only the portion of the impairment loss representing credit losses would be recognized in earnings. The credit loss on a security is measured as the difference between the amortized cost basis and the present value of the cash flows expected to be collected. Projected cash flows are discounted by the original or current effective interest rate depending on the nature of the security being measured for potential OTTI. The remaining impairment related to all other factors, the difference between the present value of the cash flows expected to be collected and fair value, is recognized as a charge to other comprehensive income (“OCI”). Impairment losses related to all other factors are presented as separate categories within OCI. The accretion of the amount recorded in OCI increases the carrying value of the investment and does not affect earnings. If there is an indication of additional credit losses the security is re-evaluated according to the procedures described above. No OTTI losses were recognized during the nine months ended September 30, 2013, and the year ended December 31, 2012.
	Restricted Equity Securities
	Restricted equity securities represent the Company’s investment in the stock of the Federal Home Loan Bank of San Francisco (“FHLB”) and are carried at par value, which reasonably approximates its fair value. While technically these are considered equity securities, there is no market for the FHLB stock. Therefore, the shares are considered as restricted investment securities. Management periodically evaluates FHLB stock for other-than-temporary impairment. Management’s determination of whether these investments are impaired is based on its assessment of the ultimate recoverability of cost rather than by recognizing temporary declines in value. The determination of whether a decline affects the ultimate recoverability of cost is influenced by criteria such as (1) the significance of any decline in net assets of the FHLB as compared to the capital stock amount for the FHLB and the length of time this situation has persisted, (2) commitments by the FHLB to make payments required by law or regulation and the level of such payments in relation to the operating performance of the FHLB, (3) the impact of legislative and regulatory changes on institutions and, accordingly, the customer base of the FHLB, and (4) the liquidity position of the FHLB.
	As a member of the FHLB system, the Company is required to maintain a minimum level of investment in FHLB stock based on specific percentages of its outstanding mortgages, total assets, or FHLB advances. The Company may request redemption at par value of any stock in excess of the minimum required investment. Stock redemptions are at the discretion of the FHLB.
	Loans Held for Sale
	Loans originated and intended for sale in the secondary market are carried at the lower of aggregate cost or fair value, as determined by aggregate outstanding commitments from investors of current investor yield requirements. Net unrealized losses are recognized through a valuation allowance by charges to noninterest income.
	Mortgage loans held for sale are generally sold with the mortgage servicing rights retained by the Company. Gains or losses on the sale of loans that are held for sale are recognized at the time of the sale and determined by the difference between net sale proceeds and the net book value of the loans less the estimated fair value of any retained mortgage servicing rights.
	Loans and Allowance for Loan Losses
	Loans originated by the Company, i.e., not purchased or acquired in a business combination, are referred to as originated loans. Originated loans that management has the intent and ability to hold for the foreseeable future or until maturity or payoff are reported at the principal amount outstanding, net of deferred loan fees and costs. Loan origination and commitment fees and certain direct loan origination costs are deferred, and the net amount is amortized as an adjustment of the related loan’s yield over the actual life of the loan. Originated loans on which the accrual of interest has been discontinued are designated as nonaccrual loans.
	Originated loans are placed in nonaccrual status when reasonable doubt exists as to the full, timely collection of interest or principal, or a loan becomes contractually past due by 90 days or more with respect to interest or principal and is not well secured and in the process of collection. When an originated loan is placed on nonaccrual status, all interest previously accrued but not collected is reversed. Income on such loans is then recognized only to the extent that cash is received and where the future collection of principal is probable. Interest accruals are resumed on such loans only when they are brought fully current with respect to interest and principal and when, in the judgment of Management, the loan is estimated to be fully collectible as to both principal and interest.
	An allowance for loan losses for originated loans is established through a provision for loan losses charged to expense. The allowance is maintained at a level which, in Management’s judgment, is adequate to absorb probable incurred credit losses inherent in the loan portfolio as of the balance sheet date. Originated loans and deposit related overdrafts are charged against the allowance for loan losses when Management believes that the collectability of the principal is unlikely or, with respect to consumer installment loans, according to an established delinquency schedule. The allowance is an amount that Management believes will be adequate to absorb probable losses inherent in existing loans and leases, based on evaluations of the collectability, impairment and prior loss experience of loans and leases. The evaluations take into consideration such factors as changes in the nature and size of the portfolio, overall portfolio quality, loan concentrations, specific problem loans, and current economic conditions that may affect the borrower’s ability to pay. The Company defines an originated loan as impaired when it is probable the Company will be unable to collect all amounts due according to the contractual terms of the loan agreement. Impaired originated loans are measured based on the present value of expected future cash flows discounted at the loan’s original effective interest rate. As a practical expedient, impairment may be measured based on the loan’s observable market price or the fair value of the collateral if the loan is collateral dependent. When the measure of the impaired loan is less than the recorded investment in the loan, the impairment is recorded through a valuation allowance.
	In situations related to originated loans where, for economic or legal reasons related to a borrower’s financial difficulties, the Company grants a concession for other than an insignificant period of time to the borrower that the Company would not otherwise consider, the related loan is classified as a troubled debt restructuring (TDR). The Company strives to identify borrowers in financial difficulty early and work with them to modify to more affordable terms before their loan reaches nonaccrual status. These modified terms may include rate reductions, principal forgiveness, payment forbearance and other actions intended to minimize the economic loss and to avoid foreclosure or repossession of the collateral. In cases where the Company grants the borrower new terms that result in the loan being classified as a TDR, the Company measures any impairment on the restructuring as noted above for impaired loans. TDR loans are classified as impaired until they are fully paid off or charged off. Loans that are in nonaccrual status at the time they become TDR loans, remain in nonaccrual status until the borrower demonstrates a sustained period of performance which the Company generally believes to be six consecutive months of payments, or equivalent. Otherwise, TDR loans are subject to the same nonaccrual and charge-off policies as noted above with respect to their restructured principal balance.
	Credit risk is inherent in the business of lending. As a result, the Company maintains an allowance for loan losses to absorb losses inherent in the Company’s originated loan portfolio. This is maintained through periodic charges to earnings. These charges are included in the Consolidated Statements of Income as provision for loan losses. All specifically identifiable and quantifiable losses are immediately charged off against the allowance. However, for a variety of reasons, not all losses are immediately known to the Company and, of those that are known, the full extent of the loss may not be quantifiable at that point in time. The balance of the Company’s allowance for originated loan losses is meant to be an estimate of these unknown but probable losses inherent in the portfolio.
	The Company formally assesses the adequacy of the allowance for originated loan losses on a quarterly basis. Determination of the adequacy is based on ongoing assessments of the probable risk in the outstanding originated loan portfolio, and to a lesser extent the Company’s originated loan commitments. These assessments include the periodic re-grading of credits based on changes in their individual credit characteristics including delinquency, seasoning, recent financial performance of the borrower, economic factors, changes in the interest rate environment, growth of the portfolio as a whole or by segment, and other factors as warranted. Loans are initially graded when originated. They are re-graded as they are renewed, when there is a new loan to the same borrower, when identified facts demonstrate heightened risk of nonpayment, or if they become delinquent. Re-grading of larger problem loans occurs at least quarterly. Confirmation of the quality of the grading process is obtained by independent credit reviews conducted by consultants specifically hired for this purpose and by various bank regulatory agencies.
	The Company’s method for assessing the appropriateness of the allowance for originated loan losses includes specific allowances for impaired originated loans and leases, formula allowance factors for pools of credits, and allowances for changing environmental factors (e.g., interest rates, growth, economic conditions, etc.). Allowance factors for loan pools were based on historical loss experience by product type and prior risk rating.
	During the three months ended March 31, 2012, management changed some of the assumptions utilized in the Allowance for Loan Losses estimate calculation. These changes were intended to more accurately reflect the current risk in the loan portfolio and to better estimate the losses inherent but not yet quantifiable. These changes included the conversion to a historical loss migration analysis intended to better determine the appropriate formula reserve ratio by loan category and risk rating, the addition of an environmental factor related to the delinquency rate of loans not classified as impaired by loan category, the elimination of an unspecified reserve allocation previously intended to account for imprecision inherent in the overall calculation, and the reclassification of risk rating of certain consumer loans based on current credit score in an attempt to better identify the risk in the portfolio. The financial effect of these changes resulted in a net reduction in the calculated Allowance for Loan Losses of $1,388,000 during the three months ended March 31, 2012. Allowances for impaired loans are based on analysis of individual credits. Allowances for changing environmental factors are Management’s best estimate of the probable impact these changes have had on the originated loan portfolio as a whole. The allowance for originated loans is included in the allowance for loan losses.
	During the three months ended March 31, 2013, the Company changed the method it uses to estimate net sale proceeds from real estate collateral sales when calculating the allowance for loan losses associated with impaired real estate collateral dependent loans. Previously, the Company used the greater of fifteen percent or actual estimated selling costs. Currently, the Company uses the actual estimated selling costs, and an adjustment to appraised value based on the age of the appraisal. These changes are intended to more accurately reflect the estimated net sale proceeds from the sale of impaired collateral dependent real estate loans. This change in methodology resulted in the allowance for loan losses as of March 31, 2013 being $494,000 more than it would have been without this change in methodology.
	During the three months ended June 30, 2013, the Company modified its loss migration analysis methodology used to determine the formula allowance factors. When the Company originally established its loss migration analysis methodology during the quarter ended March 31, 2012, it reviewed the loss experience of each quarter over the previous three years in order to calculate an annualized loss rate by loan category and risk rating. The use of three years of loss experience data was originally used because that was the extent of the detailed loss data, by loan category and risk rating that was available at the time. This three year historical look-back period was used until the quarter ended June 30, 2013. Starting with the quarter ended June 30, 2013, the Company will review all available detailed loss experience data, and not limit it to the most recent three years of historical loss data. This change is intended to more accurately reflect the risk inherent in the loan portfolio by considering historical loss data for all years as the data for new periods becomes available. This change in methodology resulted in the allowance for loan losses as of June 30, 2013 being $1,314,000 more than it would have been without this change in methodology.
	During the three months ended September 30, 2013, the Company modified its methodology used to determine the allowance for changing environmental factors. Previously, the Company compared the current value of each environmental factor to a fixed baseline value. The deviation of the current value from the baseline value was then multiplied by a conversion factor to determine the required allowance related to each environmental factor. As of September 30, 2013, the Company replaced the fixed baseline values with average baseline values derived from historical averages, and adjusted the conversion factors. This change is intended to more accurately reflect the risk inherent in the portfolio by recognizing that baseline, or normal, levels for environmental factors may change over time. This change in methodology resulted in the allowance for loan losses as of September 30, 2013 being $1,665,000 more than it would have been without this change in methodology.
	Loans purchased or acquired in a business combination are referred to as acquired loans. Acquired loans are valued as of the acquisition date in accordance with Financial Accounting Standards Board Accounting Standards Codification (“FASB ASC”) Topic 805, Business Combinations. Loans acquired with evidence of credit deterioration since origination for which it is probable that all contractually required payments will not be collected are referred to as purchased credit impaired (PCI) loans. PCI loans are accounted for under FASB ASC Topic 310-30, Loans and Debt Securities Acquired with Deteriorated Credit Quality. Under FASB ASC Topic 805 and FASB ASC Topic 310-30, PCI loans are recorded at fair value at acquisition date, factoring in credit losses expected to be incurred over the life of the loan. Accordingly, an allowance for loan losses is not carried over or recorded as of the acquisition date. Fair value is defined as the present value of the future estimated principal and interest payments of the loan, with the discount rate used in the present value calculation representing the estimated effective yield of the loan. Default rates, loss severity, and prepayment speed assumptions are periodically reassessed and our estimate of future payments is adjusted accordingly. The difference between contractual future payments and estimated future payments is referred to as the nonaccretable difference. The difference between estimated future payments and the present value of the estimated future payments is referred to as the accretable yield. The accretable yield represents the amount that is expected to be recorded as interest income over the remaining life of the loan. If after acquisition, the Company determines that the estimated future cash flows of a PCI loan are expected to be more than originally estimated, an increase in the discount rate (effective yield) would be made such that the newly increased accretable yield would be recognized, on a level yield basis, over the remaining estimated life of the loan. If, after acquisition, the Company determines that the estimated future cash flows of a PCI loan are expected to be less than previously estimated, the discount rate would first be reduced until the present value of the reduced cash flow estimate equals the previous present value however, the discount rate may not be lowered below its original level at acquisition. If the discount rate has been lowered to its original level and the present value has not been sufficiently lowered, an allowance for loan loss would be established through a provision for loan losses charged to expense to decrease the present value to the required level. If the estimated cash flows improve after an allowance has been established for a loan, the allowance may be partially or fully reversed depending on the improvement in the estimated cash flows. Only after the allowance has been fully reversed may the discount rate be increased. PCI loans are put on nonaccrual status when cash flows cannot be reasonably estimated. PCI loans on nonaccrual status are accounted for using the cost recovery method or cash basis method of income recognition. PCI loans are charged off when evidence suggests cash flows are not recoverable. Foreclosed assets from PCI loans are recorded in foreclosed assets at fair value with the fair value at time of foreclosure representing cash flow from the loan. ASC 310-30 allows PCI loans with similar risk characteristics and acquisition time frame to be “pooled” and have their cash flows aggregated as if they were one loan. The Company elected to use the “pooled” method of ASC 310-30 for PCI – other loans in the acquisition of certain assets and liabilities of Granite Community Bank (“Granite”) and Citizens Bank of Northern California (“Citizens”).
	Acquired loans that are not PCI loans are referred to as purchased not credit impaired (PNCI) loans. PNCI loans are accounted for under FASB ASC Topic 310-20, Receivables – Nonrefundable Fees and Other Costs, in which interest income is accrued on a level-yield basis for performing loans. For income recognition purposes, this method assumes that all contractual cash flows will be collected, and no allowance for loan losses is established at the time of acquistion. Post-acquisition date, an allowance for loan losses may need to be established for acquired loans through a provision charged to earnings for credit losses incurred subsequent to acquisition. Under ASC 310-20, the loss would be measured based on the probable shortfall in relation to the contractual note requirements, consistent with our allowance for loan loss policy for similar loans.
	When referring to PNCI and PCI loans we will use the terms “nonaccretable difference”, “accretable yield”, or “purchase discount”. Nonaccretable difference is the difference between undiscounted contractual cash flows due and undiscounted cash flows we expect to collect, or put another way, it is the undiscounted contractual cash flows we do not expect to collect. Accretable yield is the difference between undiscounted cash flows we expect to collect and the value at which we have recorded the loan on our financial statements. On the date of acquisition, all purchased loans are recorded on our consolidated financial statements at estimated fair value. Purchase discount is the difference between the estimated fair value of loans on the date of acquisition and the principal amount owed by the borrower, net of charge offs, on the date of acquisition. We may also refer to “discounts to principal balance of loans owed, net of charge-offs”. Discounts to principal balance of loans owed, net of charge-offs is the difference between principal balance of loans owed, net of charge-offs, and loans as recorded on our financial statements. Discounts to principal balance of loans owed, net of charge-offs arise from purchase discounts, and equal the purchase discount on the acquisition date.
	Loans are also categorized as “covered” or “noncovered”. Covered loans refer to loans covered by a Federal Deposit Insurance Corporation (“FDIC”) loss sharing agreement. Noncovered loans refer to loans not covered by a FDIC loss sharing agreement.
	Foreclosed Assets
	Foreclosed assets include assets acquired through, or in lieu of, loan foreclosure. Foreclosed assets are held for sale and are initially recorded at fair value less estimated costs to sell at the date of foreclosure, establishing a new cost basis. Subsequent to foreclosure, management periodically performs valuations and the assets are carried at the lower of carrying amount or fair value less cost to sell. Revenue and expenses from operations and changes in the valuation allowance are included in other noninterest expense. Gain or loss on sale of foreclosed assets is included in noninterest income. Foreclosed assets that are not subject to a FDIC loss-share agreement are referred to as noncovered foreclosed assets.
	Foreclosed assets acquired through FDIC-assisted acquisitions that are subject to a FDIC loss-share agreement, and all assets acquired via foreclosure of covered loans are referred to as covered foreclosed assets. Covered foreclosed assets are reported exclusive of expected reimbursement cash flows from the FDIC. Foreclosed covered loan collateral is transferred into covered foreclosed assets at the loan’s carrying value, inclusive of the acquisition date fair value discount.
	Covered foreclosed assets are initially recorded at estimated fair value less estimated costs to sell on the acquisition date based on similar market comparable valuations less estimated selling costs. Any subsequent valuation adjustments due to declines in fair value will be charged to noninterest expense, and will be mostly offset by noninterest income representing the corresponding increase to the FDIC indemnification asset for the offsetting loss reimbursement amount. Any recoveries of previous valuation adjustments will be credited to noninterest expense with a corresponding charge to noninterest income for the portion of the recovery that is due to the FDIC.
	Premises and Equipment
	Land is carried at cost. Land improvements, buildings and equipment, including those acquired under capital lease, are stated at cost less accumulated depreciation and amortization. Depreciation and amortization expenses are computed using the straight-line method over the estimated useful lives of the related assets or lease terms. Asset lives range from 3-10 years for furniture and equipment and 15-40 years for land improvements and buildings.
	Goodwill and Other Intangible Assets
	Goodwill represents the excess of costs over fair value of net assets of businesses acquired. Goodwill and other intangible assets acquired in a purchase business combination and determined to have an indefinite useful life are not amortized, but instead tested for impairment at least annually. Intangible assets with estimable useful lives are amortized over their respective estimated useful lives to their estimated residual values, and reviewed for impairment.
	The Company has an identifiable intangible asset consisting of core deposit intangibles (CDI). CDI are amortized over their respective estimated useful lives, and reviewed for impairment.
	Impairment of Long-Lived Assets and Goodwill
	Long-lived assets, such as premises and equipment, and purchased intangibles subject to amortization, are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable. Recoverability of assets to be held and used is measured by a comparison of the carrying amount of an asset to estimated undiscounted future cash flows expected to be generated by the asset. If the carrying amount of an asset exceeds its estimated future cash flows, an impairment charge is recognized by the amount by which the carrying amount of the asset exceeds the fair value of the asset. Assets to be disposed of would be separately presented in the balance sheet and reported at the lower of the carrying amount or fair value less costs to sell, and are no longer depreciated. The assets and liabilities of a disposed group classified as held for sale would be presented separately in the appropriate asset and liability sections of the consolidated balance sheet.
	As of December 31 of each year, goodwill is tested for impairment, and is tested for impairment more frequently if events and circumstances indicate that the asset might be impaired. An impairment loss is recognized to the extent that the carrying amount exceeds the asset’s fair value. This determination is made at the reporting unit level. The Company may choose to first assess qualitative factors to determine whether the existence of events or circumstances leads to a determination that it is more likely than not that the fair value of a reporting unit is less than its carrying amount. If, after assessing the totality of events or circumstances, the Company determines it is not more likely than not that the fair value of a reporting unit is less than its carrying amount, then goodwill is deemed not to be impaired. However, if the Company concludes otherwise, or if the Company elected not to first assess qualitative factors, then the Company performs the first step of a two-step impairment test by calculating the fair value of the reporting unit and comparing the fair value with the carrying amount of the reporting unit. Second, if the carrying amount of the reporting unit exceeds its fair value, an impairment loss is recognized for any excess of the carrying amount of the reporting unit’s goodwill over the implied fair value of that goodwill. The implied fair value of goodwill is determined by allocating the fair value of the reporting unit in a manner similar to a purchase price allocation. The residual fair value after this allocation is the implied fair value of the reporting unit goodwill. Currently, and historically, the Company is comprised of only one reporting unit that operates within the business segment it has identified as “community banking”. Goodwill was not impaired as of December 31, 2012 because the fair value of the reporting unit exceeded its carrying value.
	Mortgage Servicing Rights
	Mortgage servicing rights (MSR) represent the Company’s right to a future stream of cash flows based upon the contractual servicing fee associated with servicing mortgage loans. Our MSR arise from residential mortgage loans that we originate and sell, but retain the right to service the loans. The net gain from the retention of the servicing right is included in gain on sale of loans in noninterest income when the loan is sold. Fair value is based on market prices for comparable mortgage servicing contracts, when available, or alternatively, is based on a valuation model that calculates the present value of estimated future net servicing income. The valuation model incorporates assumptions that market participants would use in estimating future net servicing income, such as the cost to service, the discount rate, the custodial earnings rate, an inflation rate, ancillary income, prepayment speeds and default rates and losses. Servicing fees are recorded in noninterest income when earned.
	We account for MSR at fair value. The determination of fair value of our MSR requires management judgment because they are not actively traded. The determination of fair value for MSR requires valuation processes which combine the use of discounted cash flow models and extensive analysis of current market data to arrive at an estimate of fair value. The cash flow and prepayment assumptions used in our discounted cash flow model are based on empirical data drawn from the historical performance of our MSR, which we believe are consistent with assumptions used by market participants valuing similar MSR, and from data obtained on the performance of similar MSR. The key assumptions used in the valuation of MSR include mortgage prepayment speeds and the discount rate. These variables can, and generally will, change from quarter to quarter as market conditions and projected interest rates change. The key risks inherent with MSR are prepayment speed and changes in interest rates. The Company uses an independent third party to determine fair value of MSR.
	Indemnification Asset
	The Company accounts for amounts receivable under loss-share agreements with the FDIC as indemnification assets in accordance with FASB ASC Topic 805, Business Combinations. FDIC indemnification assets are initially recorded at fair value, based on the discounted value of expected future cash flows under the loss-share agreements. The difference between the fair value and the undiscounted cash flows the Company expects to collect from the FDIC will be accreted into noninterest income over the life of the FDIC indemnification asset. FDIC indemnification assets are reviewed quarterly and adjusted for any changes in expected cash flows based on recent performance and expectations for future performance of the covered portfolios. These adjustments are measured on the same basis as the related covered loans and covered other real estate owned. Any increases in cash flow of the covered assets over those expected will reduce the FDIC indemnification asset and any decreases in cash flow of the covered assets under those expected will increase the FDIC indemnification asset. Increases and decreases to the FDIC indemnification asset are recorded as adjustments to noninterest income.
	Reserve for Unfunded Commitments
	The reserve for unfunded commitments is established through a provision for losses – unfunded commitments charged to noninterest expense. The reserve for unfunded commitments is an amount that Management believes will be adequate to absorb probable losses inherent in existing commitments, including unused portions of revolving lines of credits and other loans, standby letters of credits, and unused deposit account overdraft privilege. The reserve for unfunded commitments is based on evaluations of the collectability, and prior loss experience of unfunded commitments. The evaluations take into consideration such factors as changes in the nature and size of the loan portfolio, overall loan portfolio quality, loan concentrations, specific problem loans and related unfunded commitments, and current economic conditions that may affect the borrower’s or depositor’s ability to pay.
	During the three months ended June 30, 2013, the Company modified the methodology employed to estimate potential losses on unfunded commitments. Similar to the Allowance for Loan and Lease Losses, the Company performs a migration analysis of historical loss experience. Prior to this quarter, the loss experience of each quarter over the previous three years was reviewed in order to calculate an annualized loss rate by loan category. Going forward, the Company has chosen to review all loss experience available since the conversion to a loss migration analysis. This change is intended to more accurately reflect the risk inherent in the unfunded commitments and appropriately consider all losses incurred in prior years. This change in methodology resulted in the reserve for unfunded commitments as of June 30, 2013 being $335,000 more than it would have been without this change in methodology.
	Income Taxes
	The Company’s accounting for income taxes is based on an asset and liability approach. The Company recognizes the amount of taxes payable or refundable for the current year, and deferred tax assets and liabilities for the future tax consequences that have been recognized in its financial statements or tax returns. The measurement of tax assets and liabilities is based on the provisions of enacted tax laws. A valuation allowance, if needed, reduces deferred tax assets to the expected amount most likely to be realized. Realization of deferred tax assets is dependent upon the generation of a sufficient level of future taxable income and recoverable taxes paid in prior years. Although realization is not assured, management believes it is more likely than not that all of the deferred tax assets will be realized. Interest and/or penalties related to income taxes are reported as a component of noninterest income.
	Off-Balance Sheet Credit Related Financial Instruments
	In the ordinary course of business, the Company has entered into commitments to extend credit, including commitments under credit card arrangements, commercial letters of credit, and standby letters of credit. Such financial instruments are recorded when they are funded.
	Geographical Descriptions
For the purpose of describing the geographical location of the Company’s loans, the Company has defined northern California as that area of California north of, and including, Stockton; central California as that area of the state south of Stockton, to and including, Bakersfield; and southern California as that area of the state south of Bakersfield.
Reclassifications
Certain amounts reported in previous consolidated financial statements have been reclassified to conform to the presentation in this report. These reclassifications did not affect previously reported net income or total shareholders’ equity.
Recent Accounting Pronouncements
FASB issued Accounting Standards Update (“ASU”) No. 2012-06, Business Combinations (Topic 805): Subsequent Accounting for an Indemnification Asset Recognized at the Acquisition Date as a Result of a Government-Assisted Acquisition of a Financial Institution. ASU 2012-06 requires that when a reporting entity recognizes an indemnification asset (in accordance with Subtopic 805-20) as a result of a government-assisted acquisition of a financial institution and subsequently a change in the cash flows expected to be collected on the indemnification asset occurs (as a result of a change in cash flows expected to be collected on the assets subject to indemnification), the reporting entity should subsequently account for the change in the measurement of the indemnification asset on the same basis as the change in the assets subject to indemnification. Any amortization of changes in value should be limited to the contractual term of the indemnification agreement (that is, the lesser of the term of the indemnification agreement and the remaining life of the indemnified assets). The Company adopted this Standard on January 1, 2013, and the adoption did not have a significant impact on the Company’s consolidated financial statements.
FASB issued ASU No. 2013-02, Comprehensive Income (Topic 220): Reporting of Amounts Reclassified Out of Accumulated Other Comprehensive Income. ASU 2013-02 amends recent guidance related to the reporting of comprehensive income to enhance the reporting of reclassifications out of accumulated other comprehensive income. The Company adopted this Standard on January 1, 2013, and the adoption did not have a significant impact on the Company’s consolidated financial statements.

Business_Combinations

Business Combinations	9 Months Ended
	Sep. 30, 2013
Business Combinations [Abstract]	'
Business Combinations	'
	Note 2 - Business Combinations
	On September 23, 2011, the California Department of Financial Institutions closed Citizens Bank of Northern California (“Citizens”), Nevada City, California and appointed the FDIC as receiver. That same date, the Bank assumed the banking operations of Citizens from the FDIC under a whole bank purchase and assumption agreement without loss sharing.
	On May 28, 2010, the Office of the Comptroller of the Currency closed Granite Community Bank (“Granite”), Granite Bay, California and appointed the FDIC as receiver. That same date, the Bank assumed the banking operations of Granite from the FDIC under a whole bank purchase and assumption agreement with loss sharing. Under the terms of the loss sharing agreement, the FDIC will cover a substantial portion of any future losses on loans, related unfunded loan commitments, other real estate owned (OREO)/foreclosed assets and accrued interest on loans for up to 90 days. The FDIC will absorb 80% of losses and share in 80% of loss recoveries on the covered assets acquired from Granite. The loss sharing arrangements for non-single family residential and single family residential loans are in effect for 5 years and 10 years, respectively, and the loss recovery provisions are in effect for 8 years and 10 years, respectively, from the acquisition date.

Investment_Securities

Investment Securities	9 Months Ended
	Sep. 30, 2013
Investments Debt And Equity Securities [Abstract]	'
Investment Securities	'
	Note 3 - Investment Securities
	The amortized cost and estimated fair values of investments in debt and equity securities are summarized in the following tables:
		September 30, 2013
				Gross			Gross			Estimated
		Amortized		Unrealized			Unrealized			Fair
		Cost		Gains			Losses			Value
		(in thousands)
	Securities Available for Sale
	Obligations of U.S. government corporations and agencies	$	100,629	$	4,970		$	(198	)	$	105,401
	Obligations of states and political subdivisions		7,777		128			—			7,905
	Corporate debt securities		1,873		36			—			1,909
	Total securities available for sale	$	110,279	$	5,134		$	(198	)	$	115,215
	Securities Held to Maturity
	Obligations of U.S. government corporations and agencies	$	180,612	$	1,299		$	(2,905	)	$	179,006
	Obligations of states and political subdivisions		12,650		—			(1,415	)		11,235
	Total securities available for sale	$	193,262	$	1,299		$	(4,320	)	$	190,241
		31-Dec-12
				Gross			Gross			Estimated
		Amortized		Unrealized			Unrealized			Fair
		Cost		Gains			Losses			Value
		(in thousands)
	Securities Available for Sale
	Obligations of U.S. government corporations and agencies	$	143,633	$	8,068			—		$	151,701
	Obligations of states and political subdivisions		9,098		323			—			9,421
	Corporate debt securities		1,862		43			—			1,905
	Total securities available for sale	$	154,593	$	8,434			—		$	163,027
	The Company had no investment securities held to maturity at December 31, 2012.
	No investment securities were sold during the nine months ended September 30, 2013 or the year ended December 31, 2012. Investment securities with an aggregate carrying value of $66,442,000 and $66,911,000 at September 30, 2013 and December 31, 2012, respectively, were pledged as collateral for specific borrowings, lines of credit and local agency deposits.
	The amortized cost and estimated fair value of debt securities at September 30, 2013 by contractual maturity are shown below. Actual maturities may differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties. At September 30, 2013, obligations of U.S. government corporations and agencies with a cost basis totaling $281,241,000 consist almost entirely of mortgage-backed securities whose contractual maturity, or principal repayment, will follow the repayment of the underlying mortgages. For purposes of the following table, the entire outstanding balance of these mortgage-backed securities issued by U.S. government corporations and agencies is categorized based on final maturity date. At September 30, 2013, the Company estimates the average remaining life of these mortgage-backed securities issued by U.S. government corporations and agencies to be approximately 5.6 years. Average remaining life is defined as the time span after which the principal balance has been reduced by half.
	Investment Securities	Available for Sale					Held to Maturity
	(In thousands)	Amortized		Estimated			Amortized			Estimated
		Cost		Fair Value			Cost			Fair Value
	Due in one year	$	2,554	$	2,594			—			—
	Due after one year through five years		4,514		4,699			—			—
	Due after five years through ten years		34,963		36,190			—			—
	Due after ten years		68,248		71,732		$	193,262		$	190,241
	Totals	$	110,279	$	115,215		$	193,262		$	190,241
	Gross unrealized losses on investment securities and the fair value of the related securities, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position, were as follows:
		Less than 12 months					12 months or more					Total
		Fair		Unrealized			Fair			Unrealized		Fair		Unrealized
	September 30, 2013:	Value		Loss			Value			Loss		Value		Loss
		(In thousands)
	Investment Securities Available for Sale:
	Obligations of U.S. government corporations and agencies	$	10,962	$	(198	)		—			—	$	10,962	$	(198	)
	Obligations of states and political subdivisions		—		—			—			—		—		—
	Corporate debt securities		—		—			—			—		—		—
	Total Investment Securities Available for Sale	$	10,962	$	(198	)		—			—	$	10,962	$	(198	)
	Investment Securities Held to Maturity:
	Obligations of U.S. government corporations and agencies	$	69,193	$	(2,905	)		—			—	$	69,193	$	(2,905	)
	Obligations of states and political subdivisions		11,235		(1,415	)		—			—		11,235		(1,415	)
	Total Investment Securities Held to Maturity	$	80,428	$	(4,320	)		—			—	$	80,428	$	(4,320	)
	At December 31, 2012, the Company had no investment securities with gross unrealized losses.
	Obligations of U.S. government corporations and agencies: Unrealized losses on investments in obligations of U.S. government corporations and agencies are caused by interest rate increases. The contractual cash flows of these securities are guaranteed by U.S. Government Sponsored Entities (principally Fannie Mae and Freddie Mac). It is expected that the securities would not be settled at a price less than the amortized cost of the investment. Because the decline in fair value is attributable to changes in interest rates and not credit quality, and because the Company does not intend to sell and more likely than not will not be required to sell these securities, these investments are not considered other-than-temporarily impaired. At September 30, 2013, 10 debt securities representing obligations of U.S. government corporations and agencies had unrealized losses with aggregate depreciation of 3.73% from the Company’s amortized cost basis.
	Obligations of states and political subdivisions: The unrealized losses on investments in obligations of states and political subdivisions were caused by increases in required yields by investors in these types of securities. It is expected that the securities would not be settled at a price less than the amortized cost of the investment. Because the decline in fair value is attributable to changes in interest rates and not credit quality, and because the Company does not intend to sell and more likely than not will not be required to sell these securities, these investments are not considered other-than-temporarily impaired. At September 30, 2013, 14 debt securities representing obligations of states and political subdivisions had unrealized losses with aggregate depreciation of 11.19% from the Company’s amortized cost basis.

Loans

Loans	9 Months Ended
	Sep. 30, 2013
Receivables [Abstract]	'
Loans	'
	Note 4 – Loans
	A summary of loan balances follows (in thousands):
		September 30, 2013
								PCI -			PCI -
		Originated			PNCI			Cash basis			Other			Total
	Mortgage loans on real estate:
	Residential 1-4 family	$	128,974		$	61,808			—		$	6,347		$	197,129
	Commercial		801,570			62,104			—			30,672			894,346
	Total mortgage loan on real estate		930,544			123,912			—			37,019			1,091,475
	Consumer:
	Home equity lines of credit		321,512			14,367		$	6,452			4,017			346,348
	Home equity loans		12,845			281			49			555			13,730
	Auto Indirect		1,351			—			—			—			1,351
	Other		26,106			2,101			—			75			28,282
	Total consumer loans		361,814			16,749			6,501			4,647			389,711
	Commercial		126,034			775			25			6,782			133,616
	Construction:
	Residential		26,369			—			—			1,232			27,601
	Commercial		14,074			—			—			574			14,648
	Total construction		40,443			—			—			1,806			42,249
	Total loans, net of deferred loan fees	$	1,458,835		$	141,436		$	6,526		$	50,254		$	1,657,051
	Total principal balance of loans owed, net of charge-offs	$	1,462,146		$	150,042		$	17,398		$	62,239		$	1,691,825
	Unamortized net deferred loan fees		(3,311	)											(3,311	)
	(Discounts) premiums, net, to principal balance of loans owed, net of charge-offs		—			(8,606	)		(10,872	)		(11,985	)		(31,463	)
	Total loans, net of unamortized deferred loan fees	$	1,458,835		$	141,436		$	6,526		$	50,254		$	1,657,051
	Noncovered loans	$	1,458,835		$	141,436		$	6,526		$	19,685		$	1,626,482
	Covered loans		—			—			—			30,569			30,569
	Total loans, net of unamortized deferred loan fees	$	1,458,835		$	141,436		$	6,526		$	50,254		$	1,657,051
	Allowance for loan losses	$	(32,307	)	$	(2,800	)	$	(899	)	$	(3,334	)	$	(39,340	)
	A summary of loan balances follows (in thousands):
		December 31, 2012
								PCI -			PCI -
		Originated			PNCI			Cash basis			Other			Total
	Mortgage loans on real estate:
	Residential 1-4 family	$	121,255		$	5,413			—		$	5,016		$	131,684
	Commercial		775,124			72,090		$	1,289			29,943			878,446
	Total mortgage loan on real estate		896,379			77,503			1,289			34,959			1,010,130
	Consumer:
	Home equity lines of credit		311,671			16,788			7,612			5,954			342,025
	Home equity loans		13,011			342			49			155			13,557
	Auto Indirect		3,816			—			—			—			3,816
	Other		24,263			2,418			—			32			26,713
	Total consumer loans		352,761			19,548			7,661			6,141			386,111
	Commercial		125,122			869			22			9,515			135,528
	Construction:
	Residential		11,877			—			—			6,582			18,459
	Commercial		11,196			—			—			3,399			14,595
	Total construction		23,073			—			—			9,981			33,054
	Total loans, net of deferred loan fees	$	1,397,335		$	97,920		$	8,972		$	60,596		$	1,564,823
	Total principal balance of loans owed, net of charge-offs	$	1,400,147		$	111,286		$	20,621		$	75,277		$	1,607,331
	Unamortized net deferred loan fees		(2,812	)		—			—			—			(2,812	)
	(Discounts) premiums, net, to principal balance of loans owed, net of charge-offs		—			(13,366	)		(11,649	)		(14,681	)		(39,696	)
	Total loans, net of unamortized deferred loan fees	$	1,397,335		$	97,920		$	8,972		$	60,596		$	1,564,823
	Noncovered loans	$	1,397,335		$	97,920		$	8,972		$	18,708		$	1,522,935
	Covered loans		—			—			—			41,888			41,888
	Total loans, net of unamortized deferred loan fees	$	1,397,335		$	97,920		$	8,972		$	60,596		$	1,564,823
	Allowance for loan losses	$	(35,769	)	$	(1,969	)	$	(1,054	)	$	(3,856	)	$	(42,648	)
	The following is a summary of the change in accretable yield for PCI – other loans during the periods indicated (in thousands):
		Three months ended Sept. 30,						Nine months ended Sept. 30,
		2013			2012			2013			2012
	Change in accretable yield:
	Balance at beginning of period	$	19,727		$	23,732		$	22,337		$	25,145
	Accretion to interest income		(1,656	)		(2,037	)		(4,847	)		(5,921	)
Reclassification from nonaccretable difference		1,850			2,385			2,431			4,857
Balance at end of period	$	19,921		$	24,080		$	19,921		$	24,080
Throughout these consolidated financial statements, and in particular in this Note 4 and Note 5, when we refer to “Loans” or “Allowance for loan losses” we mean all categories of loans, including Originated, PNCI, PCI – cash basis, and PCI - other. When we are not referring to all categories of loans, we will indicate which we are referring to – Originated, PNCI, PCI – cash basis, or PCI - other.

Allowance_for_Loan_Losses

Allowance for Loan Losses	9 Months Ended
	Sep. 30, 2013
Receivables [Abstract]	'
Allowance for Loan Losses	'
	Note 5 – Allowance for Loan Losses
	The following tables summarize the activity in the allowance for loan losses, and ending balance of loans, net of unearned fees for the periods indicated.
			Allowance for Loan Losses – Three months ended September 30, 2013
			RE Mortgage						Home Equity						Auto			Other						Construction
	(In thousands)		Resid.			Comm.			Lines			Loans			Indirect			Consum.			C&I			Resid.			Comm.			Total
	Beginning balance		$	3,231		$	8,764		$	18,710		$	1,109		$	114		$	567		$	4,929		$	1,288		$	887		$	39,599
	Charge-offs			(4	)		(23	)		(331	)		(30	)		(9	)		(239	)		(318	)		—			(31	)		(985	)
	Recoveries			154			295			304			3			34			199			108			2			20			1,119
	(Benefit) provision			(190	)		704			(871	)		(50	)		(58	)		7			(234	)		157			142			(393	)
	Ending balance		$	3,191		$	9,740		$	17,812		$	1,032		$	81		$	534		$	4,485		$	1,447		$	1,018		$	39,340
			Allowance for Loan Losses – As of and nine months ended September 30, 2013
			RE Mortgage						Home Equity						Auto			Other						Construction
	(In thousands)		Resid.			Comm.			Lines			Loans			Indirect			Consum.			C&I			Resid.			Comm.			Total
	Beginning balance		$	3,523		$	8,782		$	21,367		$	1,155		$	243		$	696		$	4,703		$	1,400		$	779		$	42,648
	Charge-offs			(46	)		(1,712	)		(1,843	)		(56	)		(67	)		(724	)		(1,143	)		(20	)		(92	)		(5,703	)
	Recoveries			345			965			809			29			180			601			244			63			46			3,282
	(Benefit) provision			(631	)		1,705			(2,521	)		(96	)		(275	)		(39	)		681			4			285			(887	)
	Ending balance		$	3,191		$	9,740		$	17,812		$	1,032		$	81		$	534		$	4,485		$	1,447		$	1,018		$	39,340
	Ending balance:
	Individ. evaluated for impairment		$	623		$	1,446		$	1,554		$	49		$	2		$	6		$	678		$	91		$	9		$	4,458
	Loans pooled for evaluation		$	2,235		$	7,748		$	15,259		$	983		$	79		$	521		$	2,450		$	723		$	653		$	30,649
	Loans acquired with deteriorated credit quality		$	333		$	546		$	999			—			—		$	7		$	1,358		$	633		$	356		$	4,233
			Loans, net of unearned fees – As of September 30, 2013
			RE Mortgage						Home Equity						Auto			Other						Construction
	(In thousands)		Resid.			Comm.			Lines			Loans			Indirect			Consum.			C&I			Resid.			Comm.			Total
	Ending balance:
	Total loans		$	197,129		$	894,346		$	346,348		$	13,730		$	1,351		$	28,282		$	133,616		$	27,601		$	14,648		$	1,657,051
	Individ. evaluated for impairment		$	7,013		$	69,373		$	7,664		$	551		$	66		$	94		$	3,333		$	2,872		$	252		$	91,218
	Loans pooled for evaluation		$	183,769		$	794,301		$	328,215		$	12,575		$	1,285		$	28,113		$	123,476		$	23,497		$	13,822		$	1,509,053
	Loans acquired with deteriorated credit quality		$	6,347		$	30,672		$	10,469		$	604			—		$	75		$	6,807		$	1,232		$	574		$	56,780
			Allowance for Loan Losses – As of and year ended December 31, 2012
			RE Mortgage						Home Equity						Auto			Other						Construction
	(In thousands)		Resid.			Comm.			Lines			Loans			Indirect			Consum.			C&I			Resid.			Comm.			Total
	Beginning balance		$	2,404		$	13,217		$	18,258		$	1,101		$	215		$	932		$	6,545		$	1,817		$	1,425		$	45,914
	Charge-offs			(1,558	)		(3,457	)		(8,042	)		(385	)		(83	)		(1,202	)		(1,251	)		(406	)		(100	)		(16,484	)
	Recoveries			147			1,020			398			100			215			860			643			412			—			3,795
	Provision (benefit)			2,530			(1,998	)		10,753			339			(104	)		106			(1,234	)		(423	)		(546	)		9,423
	Ending balance		$	3,523		$	8,782		$	21,367		$	1,155		$	243		$	696		$	4,703		$	1,400		$	779		$	42,648
	Ending balance:
	Individ. evaluated for impairment		$	631		$	515		$	2,264		$	81		$	5		$	47		$	840		$	11		$	111		$	4,505
	Loans pooled for evaluation		$	2,526		$	8,026		$	17,862		$	995		$	238		$	649		$	2,342		$	430		$	165		$	33,233
	Loans acquired with deteriorated credit quality		$	366		$	241		$	1,241		$	79			—			—		$	1,521		$	959		$	503		$	4,910
			Loans, net of unearned fees – As of December 31, 2012
			RE Mortgage						Home Equity						Auto			Other						Construction
	(In thousands)		Resid.			Comm.			Lines			Loans			Indirect			Consum.			C&I			Resid.			Comm.			Total
	Ending balance:
	Total loans		$	131,684		$	878,446		$	342,025		$	13,557		$	3,816		$	26,713		$	135,528		$	18,459		$	14,595		$	1,564,823
	Individ. evaluated for impairment		$	6,586		$	71,077		$	10,056		$	528		$	197		$	121		$	8,562		$	3,596		$	607		$	101,330
	Loans pooled for evaluation		$	120,082		$	776,137		$	318,403		$	12,825		$	3,619		$	26,560		$	117,429		$	8,281		$	10,589		$	1,393,925
	Loans acquired with deteriorated credit quality		$	5,016		$	31,232		$	13,566		$	204			—		$	32		$	9,537		$	6,582		$	3,399		$	69,568
			Allowance for Loan Losses – Three months ended September 30, 2012
			RE Mortgage						Home Equity						Auto			Other						Construction
	(In thousands)		Resid.			Comm.			Lines			Loans			Indirect			Consum.			C&I			Resid.			Comm.			Total
	Beginning balance		$	3,458		$	9,566		$	21,602		$	1,159		$	433		$	621		$	5,694		$	1,679		$	1,637		$	45,849
	Charge-offs			(370	)		(340	)		(1,636	)		(12	)		(12	)		(280	)		(625	)		—			(93	)		(3,368	)
	Recoveries			—			181			160			6			72			211			91			412			—			1,133
	Provision (benefit)			492			630			1,176			100			(161	)		132			(389	)		(802	)		(646	)		532
	Ending balance		$	3,580		$	10,037		$	21,302		$	1,253		$	332		$	684		$	4,771		$	1,289		$	898		$	44,146
			Allowance for Loan Losses – As of and nine months ended September 30, 2012
			RE Mortgage						Home Equity						Auto			Other						Construction
	(In thousands)		Resid.			Comm.			Lines			Loans			Indirect			Consum.			C&I			Resid.			Comm.			Total
	Beginning balance		$	2,404		$	13,217		$	18,258		$	1,101		$	215		$	932		$	6,545		$	1,817		$	1,425		$	45,914
	Charge-offs			(918	)		(2,008	)		(6,739	)		(170	)		(83	)		(928	)		(1,202	)		(362	)		(68	)		(12,478	)
Recoveries			27			999			307			15			171			653			227			412			—			2,811
Provision			2,067			(2,171	)		9,476			307			29			27			(799	)		(578	)		(459	)		7,899
Ending balance		$	3,580		$	10,037		$	21,302		$	1,253		$	332		$	684		$	4,771		$	1,289		$	898		$	44,146
Ending balance:
Individ. evaluated for impairment		$	794		$	1,234		$	2,140		$	174		$	9		$	45		$	773		$	40		$	550		$	5,759
Loans pooled for evaluation		$	2,415		$	8,239		$	17,899		$	999		$	324		$	640		$	2,445		$	465		$	81		$	33,507
Loans acquired with deteriorated credit quality		$	371		$	564		$	1,263		$	79			—			—		$	1,553		$	783		$	267		$	4,880
		Loans, net of unearned fees – As of September 30, 2012
		RE Mortgage						Home Equity						Auto			Other						Construction
(In thousands)		Resid.			Comm.			Lines			Loans			Indirect			Consum.			C&I			Resid.			Comm.			Total
Ending balance:
Total loans		$	134,041		$	873,391		$	342,898		$	14,270		$	5,067		$	26,609		$	145,469		$	18,332		$	15,570		$	1,575,647
Individ. evaluated for impairment		$	9,285		$	68,887		$	9,946		$	683		$	260		$	136		$	8,696		$	4,126		$	6,955		$	108,974
Loans pooled for evaluation		$	118,702		$	771,971		$	318,987		$	13,383		$	4,807		$	26,450		$	124,487		$	6,448		$	5,089		$	1,390,324
Loans acquired with deteriorated credit quality		$	6,054		$	32,533		$	13,965		$	204			—		$	23		$	12,286		$	7,758		$	3,526		$	76,349
As part of the on-going monitoring of the credit quality of the Company’s loan portfolio, management tracks certain credit quality indicators including, but not limited to, trends relating to (i) the level of criticized and classified loans, (ii) net charge-offs, (iii) non-performing loans, and (iv) delinquency within the portfolio.
The Company utilizes a risk grading system to assign a risk grade to each of its loans. Loans are graded on a scale ranging from Pass to Loss. A description of the general characteristics of the risk grades is as follows:
	•		Pass – This grade represents loans ranging from acceptable to very little or no credit risk. These loans typically meet most if not all policy standards in regard to: loan amount as a percentage of collateral value, debt service coverage, profitability, leverage, and working capital.
	•		Special Mention – This grade represents “Other Assets Especially Mentioned” in accordance with regulatory guidelines and includes loans that display some potential weaknesses which, if left unaddressed, may result in deterioration of the repayment prospects for the asset or may inadequately protect the Company’s position in the future. These loans warrant more than normal supervision and attention.
	•		Substandard – This grade represents “Substandard” loans in accordance with regulatory guidelines. Loans within this rating typically exhibit weaknesses that are well defined to the point that repayment is jeopardized. Loss potential is, however, not necessarily evident. The underlying collateral supporting the credit appears to have sufficient value to protect the Company from loss of principal and accrued interest, or the loan has been written down to the point where this is true. There is a definite need for a well defined workout/rehabilitation program.
	•		Doubtful – This grade represents “Doubtful” loans in accordance with regulatory guidelines. An asset classified as Doubtful has all the weaknesses inherent in a loan classified Substandard with the added characteristic that the weaknesses make collection or liquidation in full, on the basis of currently existing facts, conditions and values, highly questionable and improbable. Pending factors include proposed merger, acquisition, or liquidation procedures, capital injection, perfecting liens on additional collateral, and financing plans.
	•		Loss – This grade represents “Loss” loans in accordance with regulatory guidelines. A loan classified as Loss is considered uncollectible and of such little value that its continuance as a bankable asset is not warranted. This classification does not mean that the loan has absolutely no recovery or salvage value, but rather that it is not practical or desirable to defer writing off the loan, even though some recovery may be affected in the future. The portion of the loan that is graded loss should be charged off no later than the end of the quarter in which the loss is identified.
The following tables present ending loan balances by loan category and risk grade as of the dates indicated:
		Credit Quality Indicators – As of September 30, 2013
		RE Mortgage						Home Equity						Auto			Other						Construction
(In thousands)		Resid.			Comm.			Lines			Loans			Indirect			Consumer			C&I			Resid.			Comm.			Total
Originated loans:
Pass		$	120,824		$	731,319		$	308,997		$	11,827		$	1,051		$	25,462		$	121,901		$	22,205		$	13,268		$	1,356,854
Special mention			968			20,660			2,731			217			157			529			740			98			520			26,620
Substandard			7,182			49,591			9,784			801			143			115			3,393			4,066			286			75,361
Total Originated loans		$	128,974		$	801,570		$	321,512		$	12,845		$	1,351		$	26,106		$	126,034		$	26,369		$	14,074		$	1,458,835
PNCI loans:
Pass		$	61,123		$	55,446		$	13,466		$	281			—		$	2,039		$	450			—			—		$	132,805
Special mention			—			3,060			177			—			—			24			325			—			—			3,586
Substandard			685			3,598			724			—			—			38			—			—			—			5,045
Total PNCI loans		$	61,808		$	62,104		$	14,367		$	281			—		$	2,101		$	775			—			—		$	141,436
PCI loans		$	6,347		$	30,672		$	10,469		$	604			—		$	75		$	6,807		$	1,232		$	574		$	56,780
Total loans		$	197,129		$	894,346		$	346,348		$	13,730		$	1,351		$	28,282		$	133,616		$	27,601		$	14,648		$	1,657,051
		Credit Quality Indicators – As of December 31, 2012
		RE Mortgage						Home Equity						Auto			Other						Construction
(In thousands)		Resid.			Comm.			Lines			Loans			Indirect			Consumer			C&I			Resid.			Comm.			Total
Originated loans:
Pass		$	108,946		$	686,593		$	291,701		$	11,892		$	2,949		$	23,154		$	113,595		$	7,744		$	10,221		$	1,256,795
Special mention			3,122			21,184			6,955			555			531			958			3,224			285			356			37,170
Substandard			9,187			67,347			13,015			564			336			151			8,303			3,848			619			103,370
Total Originated loans		$	121,255		$	775,124		$	311,671		$	13,011		$	3,816		$	24,263		$	125,122		$	11,877		$	11,196		$	1,397,335
PNCI loans:
Pass		$	4,968		$	64,917		$	15,915		$	342			—		$	2,240		$	848			—			—		$	89,230
Special mention			—			5,249			193			—			—			104			21			—			—			5,567
Substandard			436			1,924			680			—			—			74			—			—			—			3,114
Loss			9			—			—			—			—			—			—			—			—			9
Total PNCI loans		$	5,413		$	72,090		$	16,788		$	342			—		$	2,418		$	869			—			—		$	97,920
PCI loans		$	5,016		$	31,232		$	13,566		$	204			—		$	32		$	9,537		$	6,582		$	3,399		$	69,568
Total loans		$	131,684		$	878,446		$	342,025		$	13,557		$	3,816		$	26,713		$	135,528		$	18,459		$	14,595		$	1,564,823
Consumer loans, whether unsecured or secured by real estate, automobiles, or other personal property, are primarily susceptible to three primary risks; non-payment due to income loss, over-extension of credit and, when the borrower is unable to pay, shortfall in collateral value. Typically non-payment is due to loss of job and will follow general economic trends in the marketplace driven primarily by rises in the unemployment rate. Loss of collateral value can be due to market demand shifts, damage to collateral itself or a combination of the two.
Problem consumer loans are generally identified by payment history of the borrower (delinquency) or significant changes in the borrower’s credit rating. Current credit scores are obtained for all consumer loans on a quarterly basis, and risk ratings are adjusted appropriately. The Bank manages its consumer loan portfolios by monitoring delinquency and contacting borrowers to encourage repayment, suggesting modifications if appropriate, and, when continued scheduled payments become unrealistic, initiating repossession or foreclosure through appropriate channels. Collateral values may be determined by appraisals obtained through Bank approved, licensed appraisers, qualified independent third parties, public value information (blue book values for autos), sales invoices, or other appropriate means. Appropriate valuations are obtained at initiation of the credit and periodically (every 3-12 months depending on collateral type) once repayment is questionable and the loan has been classified.
Commercial real estate loans generally fall into two categories, owner-occupied and non-owner occupied. Loans secured by owner occupied real estate are primarily susceptible to changes in the business conditions of the related business. This may be driven by, among other things, industry changes, geographic business changes, changes in the individual fortunes of the business owner, and general economic conditions and changes in business cycles. These same risks apply to commercial loans whether secured by equipment or other personal property or unsecured. Losses on loans secured by owner occupied real estate, equipment, or other personal property generally are dictated by the value of underlying collateral at the time of default and liquidation of the collateral. When default is driven by issues related specifically to the business owner, collateral values tend to provide better repayment support and may result in little or no loss. Alternatively, when default is driven by more general economic conditions, underlying collateral generally has devalued more and results in larger losses due to default. Loans secured by non-owner occupied real estate are primarily susceptible to risks associated with swings in occupancy or vacancy and related shifts in lease rates, rental rates or room rates. Most often these shifts are a result of changes in general economic or market conditions or overbuilding and resultant over-supply. Losses are dependent on value of underlying collateral at the time of default. Values are generally driven by these same factors and influenced by interest rates and required rates of return as well as changes in occupancy costs.
Construction loans, whether owner occupied or non-owner occupied commercial real estate loans or residential development loans, are not only susceptible to the related risks described above but the added risks of construction itself including cost over-runs, mismanagement of the project, or lack of demand or market changes experienced at time of completion. Again, losses are primarily related to underlying collateral value and changes therein as described above.
Problem commercial loans are generally identified by periodic review of financial information which may include financial statements, tax returns, rent rolls and payment history of the borrower (delinquency). Based on this information the Bank may decide to take any of several courses of action including demand for repayment, additional collateral or guarantors, and, when repayment becomes unlikely through borrower’s income and cash flow, repossession or foreclosure of the underlying collateral.
Collateral values may be determined by appraisals obtained through Bank approved, licensed appraisers, qualified independent third parties, public value information (blue book values for autos), sales invoices, or other appropriate means. Appropriate valuations are obtained at initiation of the credit and periodically (every 3-12 months depending on collateral type) once repayment is questionable and the loan has been classified.
Once a loan becomes delinquent and repayment becomes questionable, a Bank collection officer will address collateral shortfalls with the borrower and attempt to obtain additional collateral. If this is not forthcoming and payment in full is unlikely, the Bank will estimate its probable loss, using a recent valuation as appropriate to the underlying collateral less estimated costs of sale, and charge the loan down to the estimated net realizable amount. Depending on the length of time until ultimate collection, the Bank may revalue the underlying collateral and take additional charge-offs as warranted. Revaluations may occur as often as every 3-12 months depending on the underlying collateral and volatility of values. Final charge-offs or recoveries are taken when collateral is liquidated and actual loss is known. Unpaid balances on loans after or during collection and liquidation may also be pursued through lawsuit and attachment of wages or judgment liens on borrower’s other assets.
The following table shows the ending balance of current, past due, and nonaccrual originated loans by loan category as of the date indicated:
		Analysis of Past Due and Nonaccrual Originated Loans – As of September 30, 2013
(In thousands)		RE Mortgage						Home Equity						Auto			Other						Construction
Originated loan balance:		Resid.			Comm.			Lines			Loans			Indirect			Consumer			C&I			Resid.			Comm.			Total
Past due:
30-59 Days		$	184		$	5,323		$	3,258		$	67		$	38		$	28		$	372		$	107		$	49		$	9,426
60-89 Days			1,023			2,887			987			90			—			2			939			232			198			6,358
> 90 Days			176			7,234			2,007			254			40			10			125			19			68			9,933
Total past due			1,383			15,444			6,252			411			78			40			1,436			358			315			25,717
Current			127,591			786,126			315,260			12,434			1,273			26,066			124,598			26,011			13,759			1,433,118
Total Originated loans		$	128,974		$	801,570		$	321,512		$	12,845		$	1,351		$	26,106		$	126,034		$	26,369		$	14,074		$	1,458,835
> 90 Days and still accruing			—			—			—			—			—			—			—			—			—			—
Nonaccrual loans		$	4,353		$	38,241		$	6,098		$	490		$	59		$	28		$	1,152		$	2,588		$	252		$	53,261
The following table shows the ending balance of current, past due, and nonaccrual PNCI loans by loan category as of the date indicated:
		Analysis of Past Due and Nonaccrual PNCI Loans – As of September 30, 2013
(In thousands)		RE Mortgage						Home Equity						Auto			Other						Construction
PNCI loan balance:		Resid.			Comm.			Lines			Loans			Indirect			Consumer			C&I			Resid.			Comm.			Total
Past due:
30-59 Days			—		$	514			—			—			—			—			—			—			—		$	514
60-89 Days			—			1,883		$	38			—			—			—			—			—			—			1,921
> 90 Days			—			10			—			—			—			—			—			—			—			10
Total past due			—			2,407			38			—			—			—			—			—			—			2,445
Current		$	61,808			59,697			14,329		$	281			—		$	2,101		$	775			—			—			138,991
Total PNCI loans		$	61,808		$	62,104		$	14,367		$	281			—		$	2,101		$	775			—			—		$	141,436
> 90 Days and still accruing			—			—			—			—			—			—			—			—			—			—
Nonaccrual loans		$	265		$	800		$	494			—			—		$	38			—			—			—		$	1,597
The following table shows the ending balance of current, past due, and nonaccrual originated loans by loan category as of the date indicated:
		Analysis of Past Due and Nonaccrual Originated Loans – As of December 31, 2012
(In thousands)		RE Mortgage						Home Equity						Auto			Other						Construction
Originated loan balance:		Resid.			Comm.			Lines			Loans			Indirect			Consumer			C&I			Resid.			Comm.			Total
Past due:
30-59 Days		$	1,702		$	2,695		$	3,371		$	67		$	77		$	67		$	1,848		$	309			—		$	10,136
60-89 Days			278			1,578			819			33			40			40			138			—			—			2,926
> 90 Days			674			13,829			3,395			217			79			14			4,782			42		$	94			23,126
Total past due			2,654			18,102			7,585			317			196			121			6,768			351			94			36,188
Current			118,601			757,022			304,086			12,694			3,620			24,142			118,354			11,526			11,102			1,361,147
Total Originated loans		$	121,255		$	775,124		$	311,671		$	13,011		$	3,816		$	24,263		$	125,122		$	11,877		$	11,196		$	1,397,335
> 90 Days and still accruing			—			—			—			—			—			—			—			—			—			—
Nonaccrual loans		$	4,781		$	37,220		$	8,486		$	465		$	174		$	49		$	6,750		$	3,312		$	532		$	61,769
The following table shows the ending balance of current, past due, and nonaccrual PNCI loans by loan category as of the date indicated:
		Analysis of Past Due and Nonaccrual PNCI Loans – As of December 31, 2012
(In thousands)		RE Mortgage						Home Equity						Auto			Other						Construction
PNCI loan balance:		Resid.			Comm.			Lines			Loans			Indirect			Consumer			C&I			Resid.			Comm.			Total
Past due:
30-59 Days		$	1,024		$	500		$	124			—			—		$	31			—			—			—		$	1,679
60-89 Days			—			—			63			—			—			—			—			—			—			63
> 90 Days			43			148			157			—			—			—			—			—			—			348
Total past due			1,067			648			344			—			—			31			—			—			—			2,090
Current			4,346			71,442			16,444		$	342			—			2,387		$	869			—			—			95,830
Total PNCI loans		$	5,413		$	72,090		$	16,788		$	342			—		$	2,418		$	869			—			—		$	97,920
> 90 Days and still accruing			—			—			—			—			—			—			—			—			—			—
Nonaccrual loans		$	113		$	1,218		$	403			—			—		$	42			—			—			—		$	1,776
Impaired Originated and PNCI loans are those where management has concluded that it is probable that the borrower will be unable to pay all amounts due under the contractual terms.
The following tables show the recorded investment (financial statement balance), unpaid principal balance, average recorded investment, and interest income recognized for impaired Originated and PNCI loans, segregated by those with no related allowance recorded and those with an allowance recorded for the periods indicated.
		Impaired Originated Loans – As of September 30, 2013
		RE Mortgage						Home Equity						Auto			Other						Construction
(In thousands)		Resid.			Comm.			Lines			Loans			Indirect			Consumer			C&I			Resid.			Comm.			Total
With no related allowance recorded:
Recorded investment		$	4,195		$	61,418		$	3,938		$	442		$	61		$	19		$	1,161		$	2,588		$	68		$	73,890
Unpaid principal		$	6,320		$	67,314		$	7,445		$	1,131		$	135		$	32		$	1,182		$	7,345		$	68		$	90,972
Average recorded investment		$	3,911		$	61,375		$	4,543		$	415		$	120		$	19		$	2,802		$	1,837		$	137		$	75,159
Interest income recognized		$	246		$	2,644		$	268		$	21		$	10		$	2		$	61		$	81		$	1		$	3,334
With an allowance recorded:
Recorded investment		$	2,468		$	6,990		$	3,232		$	109		$	5		$	9		$	2,158		$	284		$	184		$	15,439
Unpaid principal		$	2,510		$	7,670		$	3,703		$	161		$	7		$	10		$	3,063		$	284		$	426		$	17,834
Related allowance		$	480		$	1,293		$	1,350		$	49		$	2		$	3		$	678		$	91		$	9		$	3,955
Average recorded investment		$	2,304		$	5,568		$	3,722		$	126		$	19		$	12		$	2,519		$	1,438		$	242		$	15,950
Interest income recognized		$	93		$	388		$	109		$	8			—		$	1		$	155		$	14		$	16		$	784
The following tables show the recorded investment (financial statement balance), unpaid principal balance, average recorded investment, and interest income recognized for impaired Originated and PNCI loans, segregated by those with no related allowance recorded and those with an allowance recorded for the periods indicated.
		Impaired PNCI Loans – As of September 30, 2013
		RE Mortgage						Home Equity						Auto			Other						Construction
(In thousands)		Resid.			Comm.			Lines			Loans			Indirect			Consumer			C&I			Resid.			Comm.			Total
With no related allowance recorded:
Recorded investment			—		$	800		$	290			—			—		$	38		$	14			—			—		$	1,142
Unpaid principal			—		$	2,893		$	342			—			—		$	46		$	14			—			—		$	3,295
Average recorded investment			—		$	1,088		$	367			—			—		$	30		$	4			—			—		$	1,489
Interest income recognized			—		$	154		$	19			—			—		$	4			—			—			—		$	177
With an allowance recorded:
Recorded investment		$	350		$	165		$	204			—			—		$	28			—			—			—		$	747
Unpaid principal		$	366		$	165		$	214			—			—		$	28			—			—			—		$	773
Related allowance		$	193		$	133		$	179			—			—		$	10			—			—			—		$	515
Average recorded investment		$	276		$	292		$	121			—			—		$	40			—			—			—		$	729
Interest income recognized		$	18		$	7		$	9			—			—		$	1			—			—			—		$	35
		Impaired Originated Loans – As of December 31, 2012
		RE Mortgage						Home Equity						Auto			Other						Construction
(In thousands)		Resid.			Comm.			Lines			Loans			Indirect			Consumer			C&I			Resid.			Comm.			Total
With no related allowance recorded:
Recorded investment		$	3,520		$	66,031		$	4,241		$	361		$	163		$	19		$	4,238		$	3,554		$	284		$	82,411
Unpaid principal		$	5,349		$	70,709		$	6,691		$	781		$	311		$	40		$	4,613		$	8,227		$	484		$	97,205
Average recorded investment		$	6,329		$	61,299		$	4,311		$	329		$	263		$	42		$	7,500		$	3,505		$	517		$	84,095
Interest income recognized		$	71		$	2,513		$	58		$	1		$	3			—		$	73		$	20		$	10		$	2,749
With an allowance recorded:
Recorded investment		$	2,867		$	3,258		$	5,412		$	167		$	34		$	30		$	4,324		$	42		$	323		$	16,457
Unpaid principal		$	3,432		$	3,556		$	7,103		$	396		$	51		$	32		$	4,992		$	42		$	523		$	20,127
Related allowance		$	603		$	352		$	2,237		$	81		$	5		$	12		$	840		$	11		$	111		$	4,252
Average recorded investment		$	3,890		$	7,841		$	6,331		$	317		$	102		$	49		$	2,800		$	1,543		$	6,570		$	29,443
Interest income recognized		$	67		$	129		$	103		$	16		$	1		$	1		$	100		$	6		$	5		$	428
The following tables show the recorded investment (financial statement balance), unpaid principal balance, average recorded investment, and interest income recognized for impaired PNCI and Originated loans, segregated by those with no related allowance recorded and those with an allowance recorded for the periods indicated.
		Impaired PNCI Loans – As of December 31, 2012
		RE Mortgage						Home Equity						Auto			Other						Construction
(In thousands)		Resid.			Comm.			Lines			Loans			Indirect			Consumer			C&I			Resid.			Comm.			Total
With no related allowance recorded:
Recorded investment			—		$	1,468		$	365			—			—			—			—			—			—		$	1,833
Unpaid principal			—		$	3,452		$	586			—			—			—			—			—			—		$	4,038
Average recorded investment		$	16		$	2,097		$	308		$	11			—		$	31		$	11			—			—		$	2,474
Interest income recognized			—		$	133		$	5			—			—			—			—			—			—		$	138
With an allowance recorded:
Recorded investment		$	199		$	320		$	38			—			—		$	72			—			—			—		$	629
Unpaid principal		$	225		$	331		$	41			—			—		$	76			—			—			—		$	673
Related allowance		$	28		$	163		$	27			—			—		$	35			—			—			—		$	253
Average recorded investment		$	213		$	121		$	148			—			—		$	43			—			—			—		$	525
Interest income recognized		$	9		$	12		$	1			—			—		$	2			—			—			—		$	24
		Impaired Originated Loans – As of September 30, 2012
		RE Mortgage						Home Equity						Auto			Other						Construction
(In thousands)		Resid.			Comm.			Lines			Loans			Indirect			Consumer			C&I			Resid.			Comm.			Total
With no related allowance recorded:
Recorded investment		$	5,971		$	58,397		$	4,262		$	390		$	207		$	32		$	6,907		$	3,879		$	524		$	80,569
Unpaid principal		$	8,638		$	67,181		$	7,183		$	866		$	375		$	52		$	7,753		$	9,010		$	864		$	101,922
Average recorded Investment		$	6,857		$	60,994		$	4,331		$	314		$	289		$	47		$	8,143		$	3,434		$	554		$	84,963
Interest income Recognized		$	41		$	1,178		$	36		$	4		$	3			—		$	43		$	19		$	8		$	1,332
With an allowance recorded:
Recorded investment		$	2,895		$	7,428		$	4,981		$	293		$	53		$	31		$	1,789		$	247		$	6,431		$	24,148
Unpaid principal		$	3,401		$	8,482		$	6,712		$	555		$	74		$	33		$	1,826		$	295		$	6,544		$	27,922
Related allowance		$	610		$	1,068		$	2,009		$	174		$	9		$	8		$	773		$	40		$	550		$	5,241
Average recorded Investment		$	2,934		$	6,755		$	4,527		$	261		$	90		$	39		$	1,359		$	1,529		$	6,463		$	23,957
Interest income Recognized		$	77		$	145		$	61		$	6		$	1			—		$	72		$	3		$	287		$	652
The following tables show the recorded investment (financial statement balance), unpaid principal balance, average recorded investment, and interest income recognized for impaired PNCI loans, segregated by those with no related allowance recorded and those with an allowance recorded for the periods indicated.
		Impaired PNCI Loans – As of September 30, 2012
		RE Mortgage						Home Equity						Auto			Other						Construction
(In thousands)		Resid.			Comm.			Lines			Loans			Indirect			Consumer			C&I			Resid.			Comm.			Total
With no related allowance recorded:
Recorded investment		$	63		$	2,739		$	287			—			—			—			—			—			—		$	3,089
Unpaid principal		$	63		$	4,769		$	319			—			—			—			—			—			—		$	5,151
Average recorded Investment		$	11		$	2,095		$	302		$	15			—		$	41		$	15			—			—		$	2,479
Interest income Recognized		$	3		$	130		$	8			—			—			—			—			—			—		$	141
With an allowance recorded:
Recorded investment		$	356		$	323		$	416			—			—		$	73			—			—			—		$	1,168
Unpaid principal		$	359		$	334		$	418			—			—		$	77			—			—			—		$	1,188
Related allowance		$	184		$	165		$	132			—			—		$	37			—			—			—		$	518
Average recorded Investment		$	192		$	54		$	122			—			—		$	33			—			—			—		$	401
Interest income Recognized		$	10		$	10		$	17			—			—		$	1			—			—			—		$	38
At September 30, 2013, $54,551,000 of Originated loans were TDR and classified as impaired. The Company had obligations to lend $50,000 of additional funds on these TDR as of September 30, 2013. At September 30, 2013, $928,000 of PNCI loans and $87,000 of PCI loans were TDR and classified as impaired. The Company had no obligations to lend additional funds on these TDR as of September 30, 2013.
At December 31, 2012, $57,223,000 of Originated loans were TDR and classified as impaired. The Company had obligations to lend $137,000 of additional funds on these TDR as of December 31, 2012. At December 31, 2012, $950,000 of PNCI loans were TDR and classified as impaired. The Company had no obligations to lend additional funds on these TDR as of December 31, 2012.
The following table shows certain information regarding Troubled Debt Restructurings (TDRs) that occurred during the period indicated:
		TDR Information for the Three Months Ended September 30, 2013
		RE Mortgage						Home Equity						Auto			Other						Construction
(In thousands)		Resid.			Comm.			Lines			Loans			Indirect			Consum.			C&I			Resid.			Comm.			Total
Number			4			1			3			—			—			—			5			—			—			13
Pre-modification out-standing principal balance		$	607		$	25		$	480			—			—			—		$	113			—			—		$	1,225
Post-modification out-standing principal balance		$	607		$	26		$	482			—			—			—		$	114			—			—		$	1,229
Financial impact due to troubled debt restructure taken as additional provision			—		$	4		$	27			—			—			—		$	30			—			—		$	61
Number that defaulted during the period			—			3			2			—			—			—			—			—			—			5
Recorded investment of TDRs that defaulted during the period			—		$	674		$	100			—			—			—			—			—			—		$	774
Financial impact due to the default of previous troubled debt restructure taken as charge-offs or additional provisions			—			—		$	7			—			—			—			—			—			—		$	7
The following tables show certain information regarding TDRs that occurred during the periods indicated:
		TDR Information for the Nine Months Ended September 30, 2013
		RE Mortgage						Home Equity						Auto			Other						Construction
(In thousands)		Resid.			Comm.			Lines			Loans			Indirect			Consum.			C&I			Resid.			Comm.			Total
Number			6			7			10			—			—			—			7			—			—			30
Pre-modification out-standing principal balance		$	1,039		$	4,580		$	1,062			—			—			—		$	221			—			—		$	6,902
Post-modification out-standing principal balance		$	1,043		$	4,581		$	1,069			—			—			—		$	222			—			—		$	6,915
Financial impact due to troubled debt restructure taken as additional provision		$	151		$	26		$	220			—			—			—		$	88			—			—		$	485
Number that defaulted during the period			2			7			2			—			—			—			3			1			—			15
Recorded investment of TDRs that defaulted during the period		$	181		$	1,065		$	100			—			—			—		$	1,297		$	73			—		$	3,256
Financial impact due to the default of previous troubled debt restructure taken as charge-offs or additional provisions		$	(3	)		—		$	7			—			—			—			—		$	5			—		$	9
		TDR Information for the Three Months Ended September 30, 2012
		RE Mortgage						Home Equity						Auto			Other						Construction
(Dollars in thousands)		Resid.			Comm.			Lines			Loans			Indirect			Consum.			C&I			Resid.			Comm.			Total
Number			1			4			2			—			—			—			2			1			—			10
Pre-modification out-standing principal balance		$	101		$	609		$	146			—			—			—		$	249		$	86			—		$	1,191
Post-modification out-standing principal balance		$	101		$	609		$	150			—			—			—		$	249		$	97			—		$	1,206
Financial Impact due to troubled debt restructure taken as additional provision			—		$	154			—			—			—			—		$	158			—			—		$	312
Number that defaulted during the period			—			1			2			—			—			—			—			—			2			5
Recorded investment of TDRs that defaulted during the period			—		$	625		$	169			—			—			—			—			—		$	217		$	1,011
Financial Impact due to the default of previous troubled debt restructure taken as charge-offs or additional provisions			—			—			—			—			—			—			—			—			—			—
The following table shows certain information regarding TDRs that occurred during the period indicated:
		TDR Information for the Nine Months Ended September 30, 2012
		RE Mortgage						Home Equity						Auto			Other						Construction
(In thousands)		Resid.			Comm.			Lines			Loans			Indirect			Consum.			C&I			Resid.			Comm.			Total
Number			4			14			10			—			—			1			3			3			—			35
Pre-modification out-standing principal balance		$	822		$	3,220		$	1,398			—			—		$	38		$	498		$	317			—		$	6,293
Post-modification out-standing principal balance		$	842		$	3,182		$	1,471			—			—		$	38		$	498		$	328			—		$	6,359
Financial impact due to troubled debt restructure taken as additional provision		$	(11	)	$	212		$	60			—			—			—		$	158			—			—		$	419
Number that defaulted during the period			1			8			3			1			—			—			2			1			3			19
Recorded investment of TDRs that defaulted during the period		$	112		$	4,303		$	443		$	46			—			—		$	1,124		$	97		$	256		$	6,381
Financial impact due to the default of previous troubled debt restructure taken as charge-offs or additional provisions			—			—		$	(13	)	$	(1	)		—			—		$	50			—			—		$	36
Modifications classified as Troubled Debt Restructurings can include one or a combination of the following:
	•		Rate modifications
	•		Term extensions
	•		Interest only modifications, either temporary or long-term
	•		Payment modifications
	•		Collateral substitutions/additions
For all new Troubled Debt Restructurings, an impairment analysis is conducted. If the loan is determined to be collateral dependent, any additional amount of impairment will be calculated based on the difference between estimated collectible value and the current carrying balance of the loan. This difference could result in an increased provision and is typically charged off. If the asset is determined not to be collateral dependent, the impairment is measured on the net present value difference between the estimated cash flows of the restructured loan and the cash flows which would have been received under the original terms. The effect of this could result in a requirement for additional provision to the reserve. The effect of these required provisions for the period are indicated above.
Typically if a TDR defaults during the period, the loan is then considered collateral dependent and, if it was not already considered collateral dependent, an appropriate provision will be reserved or charge will be taken. The additional provisions required resulting from default of previously modified TDR’s are noted above.

Foreclosed_Assets

Foreclosed Assets	9 Months Ended
	Sep. 30, 2013
Text Block [Abstract]	'
Foreclosed Assets	'
	Note 6 – Foreclosed Assets
	A summary of the activity in the balance of foreclosed assets follows (in thousands):
		Nine months ended September 30, 2013									Nine months ended September 30, 2012
		Noncovered			Covered			Total			Noncovered			Covered			Total
	Beginning balance, net	$	5,957		$	1,541		$	7,498		$	13,268		$	3,064		$	16,332
	Additions/transfers from loans		7,542			493			8,035			5,657			633			6,290
	Dispositions/sales		(10,004	)		(769	)		10,773	)		(10,073	)		(844	)		(10,917	)
	Valuation adjustments		(539	)		(81	)		(620	)		(1,059	)		(461	)		(1,520	)
	Ending balance, net	$	2,956		$	1,184		$	4,140		$	7,793		$	2,392		$	10,185
	Ending valuation allowance	$	(587	)	$	(340	)	$	(927	)	$	(1,385	)	$	(846	)	$	(2,231	)
	Ending number of foreclosed assets		26			5			31			42			8			50
	Proceeds from sale of foreclosed assets	$	11,383		$	869		$	12,252		$	10,271		$	1,010		$	11,281
	Gain (loss) on sale of foreclosed assets	$	1,379		$	100		$	1,479		$	198		$	166		$	364

Premises_and_Equipment

Premises and Equipment	9 Months Ended
	Sep. 30, 2013
Property Plant And Equipment [Abstract]	'
Premises and Equipment	'
	Note 7 - Premises and Equipment
	Premises and equipment were comprised of:
		September 30,			December 31,
		2013			2012
		(In thousands)
	Land & land improvements	$	5,922		$	5,929
	Buildings		30,082			23,090
	Furniture and equipment		27,590			25,877
			63,594			54,896
	Less: Accumulated depreciation		(32,393	)		(32,101	)
			31,201			22,795
	Construction in progress		45			4,190
	Total premises and equipment	$	31,246		$	26,985
	Depreciation expense for premises and equipment amounted to $1,014,000 and $820,000 for the three months ended September 30, 2013 and 2012, respectively. Depreciation expense for premises and equipment amounted to $2,489,000 and $2,450,000 for the nine months ended September 30, 2013 and 2012, respectively.

Cash_Value_of_Life_Insurance

Cash Value of Life Insurance	9 Months Ended
	Sep. 30, 2013
Investments All Other Investments [Abstract]	'
Cash Value of Life Insurance	'
	Note 8 – Cash Value of Life Insurance
	A summary of the activity in the balance of cash value of life insurance follows (in thousands):
		Nine months ended September 30,
		2013		2012
	Beginning balance	$	50,582	$	50,403
	Increase in cash value of life insurance		1,337		1,350
	Gain on life insurance death benefit		—		600
	Death benefit		—		(1,611	)
	Ending balance	$	51,919	$	50,742
	End of period death benefit	$	95,206	$	95,132
	Number of policies owned		133		136
	Insurance companies used		6		6
	Current and former employees and directors covered		36		37
	As of September 30, 2013, the Bank was the owner and beneficiary of 133 life insurance policies, issued by six life insurance companies, covering 36 current and former employees and directors. These life insurance policies are recorded on the Company’s financial statements at their reported cash (surrender) values. As a result of current tax law and the nature of these policies, the Bank records any increase in cash value of these policies as nontaxable noninterest income. If the Bank decided to surrender any of the policies prior to the death of the insured, such surrender may result in a tax expense related to the life-to-date cumulative increase in cash value of the policy. If the Bank retains such policies until the death of the insured, the Bank would receive nontaxable proceeds from the insurance company equal to the death benefit of the policies. The Bank has entered into Joint Beneficiary Agreements (JBAs) with certain of the insureds that for certain of the policies provide some level of sharing of the death benefit, less the cash surrender value, among the Bank and the beneficiaries of the insured upon the receipt of death benefits. See Note 15 of these consolidated financial statements for additional information on of JBAs.

Goodwill_and_Other_Intangible_

Goodwill and Other Intangible Assets	9 Months Ended
	Sep. 30, 2013
Goodwill And Intangible Assets Disclosure [Abstract]	'
Goodwill and Other Intangible Assets	'
	Note 9 - Goodwill and Other Intangible Assets
	The following table summarizes the Company’s goodwill intangible as of the dates indicated.
		September 30,								December 31,
	(In thousands)	2013			Additions		Reductions			2012
	Goodwill	$	15,519			—		—		$	15,519
	The following table summarizes the Company’s core deposit intangibles as of the dates indicated.
		September 30,								December 31,
	(In thousands)	2013			Additions		Reductions			2012
	Core deposit intangibles	$	1,460			—		—		$	1,460
	Accumulated amortization		(525	)		—	$	(157	)		(368	)
	Core deposit intangibles, net	$	935			—	$	(157	)	$	1,092
	The Company recorded additions to core deposit intangibles of $898,000 and $562,000 in conjunction with the Citizens and Granite acquisition on September 23, 2011 and May 28, 2010, respectively. The following table summarizes the Company’s estimated core deposit intangible amortization (in thousands):
		Estimated Core Deposit
	Years Ended	Intangible Amortization
	2013	$	209
	2014		209
	2015		209
	2016		209
	2017		209
	2018		47

Mortgage_Servicing_Rights

Mortgage Servicing Rights	9 Months Ended
	Sep. 30, 2013
Text Block [Abstract]	'
Mortgage Servicing Rights	'
	Note 10 - Mortgage Servicing Rights
	The following tables summarize the activity in, and the main assumptions we used to determine the fair value of mortgage servicing rights for the periods indicated (in thousands):
		Three months ended September 30,					Nine months ended September 30,
		2013		2012			2013			2012
	Mortgage servicing rights:
	Balance at beginning of period	$	5,571	$	4,757		$	4,552		$	4,603
	Additions		298		409			1,187			1,395
	Change in fair value		180		(681	)		310			(1,513	)
	Balance at end of period	$	6,049	$	4,485		$	6,049		$	4,485
	Servicing, late and ancillary fees received	$	428	$	389		$	1,261		$	1,140
	Balance of loans serviced at:
	Beginning of period	$	682,176	$	628,674		$	666,512		$	598,185
	End of period	$	683,910	$	642,110		$	683,910		$	642,110
	Weighted-average prepayment speed (CPR)							11	%		20.9	%
	Discount rate							10	%		10	%
	The changes in fair value of MSRs that occurred during the three and nine months ended September 30, 2013 and 2012 were mainly due to principal reductions and changes in estimated life of the MSRs.

Indemnification_Asset

Indemnification Asset	9 Months Ended
	Sep. 30, 2013
Text Block [Abstract]	'
Indemnification Asset	'
	Note 11 - Indemnification Asset
	A summary of the activity in the balance of indemnification asset follows (in thousands):
		Three months ended September 30,						Nine months ended September 30,
		2013			2012			2013			2012
	Beginning balance	$	1,441		$	4,046		$	1,997		$	4,405
	Effect of actual covered losses and change in estimated future covered losses		(505	)		(87	)		(783	)		241
	Reimbursable expenses (revenue), net		51			2			(42	)		12
	Payments received		(126	)		(1,476	)		(311	)		(2,173	)
	Ending balance	$	861		$	2,485		$	861		$	2,485

Other_Assets

Other Assets	9 Months Ended
	Sep. 30, 2013
Deferred Costs Capitalized Prepaid And Other Assets Disclosure [Abstract]	'
Other Assets	'
	Note 12 – Other Assets
	Other assets were comprised of (in thousands):
		September 30,		December 31,
		2013		2012
	Deferred tax asset, net	$	29,046	$	28,935
	Prepaid expense including FDIC assessment and taxes		1,787		3,455
	Software		1347		1,550
	Life insurance proceeds receivable		—		706
	Advanced compensation		1,253		1,440
	TriCo Capital Trust I & II		1,238		1,238
	Miscellaneous other assets		568		1,283
	Total other assets	$	35,239	$	38,607

Deposits

Deposits	9 Months Ended
	Sep. 30, 2013
Banking And Thrift [Abstract]	'
Deposits	'
	Note 13 - Deposits
	A summary of the balances of deposits follows (in thousands):
		September 30,		December 31,
		2013		2012
	Noninterest-bearing demand	$	656,266	$	684,833
	Interest-bearing demand		524,897		503,465
	Savings		811,182		762,924
	Time certificates, $100,000 and over		163,033		180,195
	Other time certificates		137,933		158,285
	Total deposits	$	2,293,311	$	2,289,702
	Certificate of deposit balances of $5,000,000 and $5,000,000 from the State of California were included in time certificates, $100,000 and over, at September 30, 2013 and December 31, 2012, respectively. The Bank participates in a deposit program offered by the State of California whereby the State may make deposits at the Bank’s request subject to collateral and credit worthiness constraints. The negotiated rates on these State deposits are generally more favorable than other wholesale funding sources available to the Bank. Overdrawn deposit balances of $1,255,000 and $1,408,000 were classified as consumer loans at September 30, 2013 and December 31, 2012, respectively.

Reserve_for_Unfunded_Commitmen

Reserve for Unfunded Commitments	9 Months Ended
	Sep. 30, 2013
Text Block [Abstract]	'
Reserve for Unfunded Commitments	'
	Note 14 – Reserve for Unfunded Commitments
	The following tables summarize the activity in reserve for unfunded commitments for the periods indicated (in thousands):
		Three months ended September 30,						Nine months ended September 30,
		2013			2012			2013			2012
	Balance at beginning of period	$	3,210		$	2,590		$	3,615		$	2,740
	Provision for losses – unfunded commitments		(335	)		(35	)		(740	)		(185	)
	Balance at end of period	$	2,875		$	2,555		$	2,875		$	2,555

Other_Liabilities

Other Liabilities	9 Months Ended
	Sep. 30, 2013
Other Liabilities Disclosure [Abstract]	'
Other Liabilities	'
	Note 15 – Other Liabilities
	Other liabilities were comprised of (in thousands):
		September 30,		December 31,
		2013		2012
	Deferred compensation	$	7,158	$	7,738
	Supplemental retirement		17,275		16,345
	Joint beneficiary agreements		2,951		2,736
	Accrued legal settlement		—		2,090
	Miscellaneous other liabilities		6,283		6,213
	Total other liabilities	$	33,667	$	35,122

Other_Borrowings

Other Borrowings	9 Months Ended
	Sep. 30, 2013
Text Block [Abstract]	'
Other Borrowings	'
	Note 16 - Other Borrowings
	A summary of the balances of other borrowings follows:
		September 30,		December 31,
	(In thousands)	2013		2012
	Other collateralized borrowings, fixed rate, as of September 30, 2013 of 0.05% payable on October 1, 2013	$	14,626	$	9,197
	Total other borrowings	$	14,626	$	9,197
	The Company had $14,626,000 and $9,197,000 of other collateralized borrowings at September 30, 2013 and December 31, 2012, respectively. Other collateralized borrowings are generally overnight maturity borrowings from non-financial institutions that are collateralized by securities owned by the Company. As of September 30, 2013, the Company has pledged as collateral and sold under agreements to repurchase investment securities with fair value of $19,105,000 under these other collateralized borrowings.
	The Company maintains a collateralized line of credit with the Federal Home Loan Bank of San Francisco. Based on the FHLB stock requirements at September 30, 2013, this line provided for maximum borrowings of $592,200,000 of which none was outstanding, leaving $592,200,000 available. As of September 30, 2013, the Company has designated loans totaling $1,084,690,000 as potential collateral under this collateralized line of credit with the FHLB.
	The Company maintains a collateralized line of credit with the Federal Reserve Bank of San Francisco. As of September 30, 2013, this line provided for maximum borrowings of $109,408,000 of which none was outstanding, leaving $109,408,000 available. As of September 30, 2013, the Company has designated investment securities with fair value of $50,000 and loans totaling $139,198,000 as potential collateral under this collateralized line of credit with the FRB.
	The Company has available unused correspondent banking lines of credit from commercial banks totaling $10,000,000 for federal funds transactions at September 30, 2013.

Junior_Subordinated_Debt

Junior Subordinated Debt	9 Months Ended
	Sep. 30, 2013
Text Block [Abstract]	'
Junior Subordinated Debt	'
	Note 17 – Junior Subordinated Debt
	On July 31, 2003, the Company formed a subsidiary business trust, TriCo Capital Trust I, to issue trust preferred securities. Concurrently with the issuance of the trust preferred securities, the trust issued 619 shares of common stock to the Company for $1,000 per share or an aggregate of $619,000. In addition, the Company issued a Junior Subordinated Debenture to the Trust in the amount of $20,619,000. The terms of the Junior Subordinated Debenture are materially consistent with the terms of the trust preferred securities issued by TriCo Capital Trust I. Also on July 31, 2003, TriCo Capital Trust I completed an offering of 20,000 shares of cumulative trust preferred securities for cash in an aggregate amount of $20,000,000. The trust preferred securities are mandatorily redeemable upon maturity on October 7, 2033 with an interest rate that resets quarterly at three-month LIBOR plus 3.05%. TriCo Capital Trust I has the right to redeem the trust preferred securities on or after October 7, 2008. The trust preferred securities were issued through an underwriting syndicate to which the Company paid underwriting fees of $7.50 per trust preferred security or an aggregate of $150,000. The net proceeds of $19,850,000 were used to finance the opening of new branches, improve bank services and technology, repurchase shares of the Company’s common stock under its repurchase plan and increase the Company’s capital. The trust preferred securities have not been and will not be registered under the Securities Act of 1933, as amended, or applicable state securities laws and were sold pursuant to an exemption from registration under the Securities Act of 1933. The trust preferred securities may not be offered or sold in the United States absent registration or an applicable exemption from the registration requirements of the Securities Act of 1933, as amended, and applicable state securities laws.
	The $20,619,000 of junior subordinated debentures issued by TriCo Capital Trust I are reflected as junior subordinated debt in the consolidated balance sheets. The common stock issued by TriCo Capital Trust I are recorded in other assets in the consolidated balance sheets.
	On June 22, 2004, the Company formed a second subsidiary business trust, TriCo Capital Trust II, to issue trust preferred securities. Concurrently with the issuance of the trust preferred securities, the trust issued 619 shares of common stock to the Company for $1,000 per share or an aggregate of $619,000. In addition, the Company issued a Junior Subordinated Debenture to the Trust in the amount of $20,619,000. The terms of the Junior Subordinated Debenture are materially consistent with the terms of the trust preferred securities issued by TriCo Capital Trust II. Also on June 22, 2004, TriCo Capital Trust II completed an offering of 20,000 shares of cumulative trust preferred securities for cash in an aggregate amount of $20,000,000. The trust preferred securities are mandatorily redeemable upon maturity on July 23, 2034 with an interest rate that resets quarterly at three-month LIBOR plus 2.55%. TriCo Capital Trust II has the right to redeem the trust preferred securities on or after July 23, 2009. The trust preferred securities were issued through an underwriting syndicate to which the Company paid underwriting fees of $2.50 per trust preferred security or an aggregate of $50,000. The net proceeds of $19,950,000 were used to finance the opening of new branches, improve bank services and technology, repurchase shares of the Company’s common stock under its repurchase plan and increase the Company’s capital. The trust preferred securities have not been and will not be registered under the Securities Act of 1933, as amended, or applicable state securities laws and were sold pursuant to an exemption from registration under the Securities Act of 1933. The trust preferred securities may not be offered or sold in the United States absent registration or an applicable exemption from the registration requirements of the Securities Act of 1933, as amended, and applicable state securities laws.
	The $20,619,000 of junior subordinated debentures issued by TriCo Capital Trust II are reflected as junior subordinated debt in the consolidated balance sheets. The common stock issued by TriCo Capital Trust II is recorded in other assets in the consolidated balance sheets.
	The debentures issued by TriCo Capital Trust I and TriCo Capital Trust II, less the common securities of TriCo Capital Trust I and TriCo Capital Trust II, continue to qualify as Tier 1 or Tier 2 capital under interim guidance issued by the Board of Governors of the Federal Reserve System (Federal Reserve Board). As of September 30, 2013, the interest rates on the junior subordinated debentures issued by TriCo Capital Trust I and II were 3.32% and 2.81%, respectively.

Commitments_and_Contingencies

Commitments and Contingencies	9 Months Ended
	Sep. 30, 2013
Commitments And Contingencies Disclosure [Abstract]	'
Commitments and Contingencies	'
	Note 18 - Commitments and Contingencies
	Restricted Cash Balances— Reserves (in the form of deposits with the Federal Reserve Bank) of $33,755,000 and $31,594,000 were maintained to satisfy Federal regulatory requirements at September 30, 2013 and December 31, 2012, respectively. These reserves are included in cash and due from banks in the accompanying balance sheets.
	Lease Commitments— The Company leases 48 sites under non-cancelable operating leases. The leases contain various provisions for increases in rental rates, based either on changes in the published Consumer Price Index or a predetermined escalation schedule. Substantially all of the leases provide the Company with the option to extend the lease term one or more times following expiration of the initial term.
	At December 31, 2012, future minimum commitments under non-cancelable operating leases with initial or remaining terms of one year or more are as follows:
		Operating
		Leases
		(In thousands)
	2013	$	2,772
	2014		2,417
	2015		1,536
	2016		954
	2017		617
	Thereafter		1,312
	Future minimum lease payments	$	9,608
	Rent expense under operating leases was $1,071,000 and $1,054,000 during the three months ended September 30, 2013 and 2012, respectively. Rent expense under operating leases was $3,257,000 and $3,205,000 during the nine months ended September 30, 2013 and 2012, respectively.
	Financial Instruments with Off-Balance-Sheet Risk— The Company is a party to financial instruments with off-balance sheet risk in the normal course of business to meet the financing needs of its customers. These financial instruments include commitments to extend credit, standby letters of credit, and deposit account overdraft privilege. Those instruments involve, to varying degrees, elements of risk in excess of the amount recognized in the balance sheet. The contract amounts of those instruments reflect the extent of involvement the Company has in particular classes of financial instruments.
	The Company’s exposure to loss in the event of nonperformance by the other party to the financial instrument for commitments to extend credit and standby letters of credit written is represented by the contractual amount of those instruments. The Company uses the same credit policies in making commitments and conditional obligations as it does for on-balance sheet instruments. The Company’s exposure to loss in the event of nonperformance by the other party to the financial instrument for deposit account overdraft privilege is represented by the overdraft privilege amount disclosed to the deposit account holder.
	The following table presents a summary of the Bank’s commitments and contingent liabilities:
	(In thousands)	September 30,		December 31,
		2013		2012
	Financial instruments whose amounts represent risk:
	Commitments to extend credit:
	Commercial loans	$	119,638	$	123,517
	Consumer loans		356,850		369,467
	Real estate mortgage loans		31,926		27,959
	Real estate construction loans		22,003		36,311
	Standby letters of credit		2,013		2,905
	Deposit account overdraft privilege		70,424		69,675
	Commitments to extend credit are agreements to lend to a customer as long as there is no violation of any condition established in the contract. Commitments generally have fixed expiration dates of one year or less or other termination clauses and may require payment of a fee. Since many of the commitments are expected to expire without being drawn upon, the total commitment amounts do not necessarily represent future cash requirements. The Company evaluates each customer’s credit worthiness on a case-by-case basis. The amount of collateral obtained, if deemed necessary by the Company upon extension of credit, is based on Management’s credit evaluation of the customer. Collateral held varies, but may include accounts receivable, inventory, property, plant and equipment, residential properties, and income-producing commercial properties.
	Standby letters of credit are conditional commitments issued by the Company to guarantee the performance of a customer to a third party. Those guarantees are primarily issued to support private borrowing arrangements. Most standby letters of credit are issued for one year or less. The credit risk involved in issuing letters of credit is essentially the same as that involved in extending loan facilities to customers. Collateral requirements vary, but in general follow the requirements for other loan facilities.
	Deposit account overdraft privilege amount represents the unused overdraft privilege balance available to the Company’s deposit account holders who have deposit accounts covered by an overdraft privilege. The Company has established an overdraft privilege for certain of its deposit account products whereby all holders of such accounts who bring their accounts to a positive balance at least once every thirty days receive the overdraft privilege. The overdraft privilege allows depositors to overdraft their deposit account up to a predetermined level. The predetermined overdraft limit is set by the Company based on account type.
	Legal Proceedings—The Bank owns 10,214 shares of Class B common stock of Visa Inc. which are convertible into Class A common stock at a conversion ratio of 0.4206 per Class A share. As of September 30, 2013, the value of the Class A shares was $191.10 per share. Utilizing the conversion ratio, the value of unredeemed Class A equivalent shares owned by the Company was $821,000 as of September 30, 2013, and has not been reflected in the accompanying financial statements. The shares of Visa Class B common stock are restricted and may not be transferred. Visa Member Banks are required to fund an escrow account to cover settlements, resolution of pending litigation and related claims. If the funds in the escrow account are insufficient to settle all the covered litigation, Visa may sell additional Class A shares, use the proceeds to settle litigation, and further reduce the conversion ratio. If funds remain in the escrow account after all litigation is settled, the Class B conversion ratio will be increased to reflect that surplus.
	On September 27, 2012, the Company announced that the Bank entered into a tentative settlement with a former employee who filed a class action lawsuit against the Bank in the Superior Court of California, Kern County on behalf of herself and a putative class of current and former Bank employees serving as assistant branch managers seeking undisclosed damages, alleging that the Bank improperly classified its assistant branch managers as exempt employees under California laws. The lawsuit alleges claims for: failure to pay overtime compensation; failure to provide meal periods; failure to provide rest periods; failure to provide accurate wage statements; failure to provide suitable seating; declaratory relief; accounting; and unfair business practices in violation of California Business and Professions Code section 17200. On September 26, 2012, after efforts to mediate the claim, the Bank and the former employee agreed to settle the case in an amount ranging from $2,039,500 to $2,500,000, depending primarily on the number of class participants who file claims, and pending final approval by the court, including determination of the method to allocate settlement payments among current and former employees who are members of the defined settlement class, and the portion of the total settlement allocable to attorney’s fees and costs to plaintiff’s counsel. On September 26, 2012, the Bank recorded a $2,090,000 expense and accrued liability in anticipation of approval of this settlement by the court and estimated related payroll taxes. On May 7, 2013, the court preliminariy approved the settlement. On August 27, 2013, the court approved a final settlement agreement for $2,429,000, and the Bank recorded an additional $339,000 expense and accrued liaibility related to this matter. During September 2013, the Bank paid the settlement amount.
	The Company is a defendant in other legal actions arising from normal business activities. Management believes, after consultation with legal counsel, that these actions are without merit or that the ultimate liability, if any, resulting from them will not materially affect the Company’s consolidated financial position or results from operations.
	Other Commitments and Contingencies—The Company has entered into employment agreements or change of control agreements with certain officers of the Company providing severance payments and accelerated vesting of benefits under supplemental retirement agreements to the officers in the event of a change in control of the Company and termination for other than cause or after a substantial and material change in the officer’s title, compensation or responsibilities.
	Mortgage loans sold to investors may be sold with servicing rights retained, with only the standard legal representations and warranties regarding recourse to the Bank. Management believes that any liabilities that may result from such recourse provisions are not significant.

Shareholders_Equity

Shareholders' Equity	9 Months Ended
	Sep. 30, 2013
Equity [Abstract]	'
Shareholders' Equity	'
	Note 19 – Shareholders’ Equity
	Dividends Paid
	The Bank paid to the Company cash dividends in the aggregate amounts of $6,080,000 and $6,872,000 during the nine months ended September 30, 2013 and 2012, respectively. The Bank is regulated by the FDIC and the State of California Department of Business Oversight. Absent approval from the Commissioner of Business Oversight of California, California banking laws generally limit the Bank’s ability to pay dividends to the lesser of (1) retained earnings or (2) net income for the last three fiscal years, less cash distributions paid during such period.
	Shareholders’ Rights Plan
	On June 25, 2001, the Company announced that its Board of Directors adopted and entered into a Shareholder Rights Plan designed to protect and maximize shareholder value and to assist the Board of Directors in ensuring fair and equitable benefit to all shareholders in the event of a hostile bid to acquire the Company. On July 8, 2011, the Company amended the Rights Plan to extend its maturity until July 10, 2021. The Company adopted this Rights Plan to protect shareholders from coercive or otherwise unfair takeover tactics. In general terms, the Rights Plan imposes a significant penalty upon any person or group that acquires 15% or more of the Company’s outstanding common stock without approval of the Company’s Board of Directors. The Rights Plan was not adopted in response to any known attempt to acquire control of the Company. Under the Rights Plan, a dividend of one Preferred Stock Purchase Right was declared for each common share held of record as of the close of business on July 10, 2001. No separate certificates evidencing the rights will be issued unless and until they become exercisable. The rights generally will not become exercisable unless an acquiring entity accumulates or initiates a tender offer to purchase 15% or more of the Company’s common stock. In that event, each right will entitle the holder, other than the unapproved acquirer and its affiliates, to purchase either the Company’s common stock or shares in an acquiring entity at one-half of market value. The rights’ initial exercise price, which is subject to adjustment, is $49.00 per right. The Company’s Board of Directors generally will be entitled to redeem the rights at a redemption price of $0.01 per right until an acquiring entity acquires a 15% position.
	Stock Repurchase Plan
	On August 21, 2007, the Board of Directors adopted a plan to repurchase, as conditions warrant, up to 500,000 shares of the Company’s common stock on the open market. The timing of purchases and the exact number of shares to be purchased will depend on market conditions. The 500,000 shares authorized for repurchase under this stock repurchase plan represented approximately 3.2% of the Company’s 15,814,662 outstanding common shares as of August 21, 2007. This stock repurchase plan has no expiration date. As of September 30, 2013, the Company had repurchased 166,600 shares under this plan.
	Stock Repurchased Under Equity Compensation Plans
	During the nine months ended September 30, 2013, 172,941 shares of the Company’s common stock with a market value of $3,490,000 were tendered in lieu of cash to exercise options to purchase shares of the Company’s stock and to pay income taxes related to such exercises as permitted by the Company’s shareholder-approved equity compensation plans. The tendered shares were retired. The market value of tendered shares is the last market trade price at closing on the day an option is exercised. Stock repurchased under equity incentive plans are not counted in the total of stock repurchased under the stock repurchase plan announced August 21, 2007.

Stock_Options_and_Other_Equity

Stock Options and Other Equity-Based Incentive Instruments	9 Months Ended
	Sep. 30, 2013
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]	'
Stock Options and Other Equity-Based Incentive Instruments	'
	Note 20 - Stock Options and Other Equity-Based Incentive Instruments
	In March 2009, the Company’s Board of Directors adopted the TriCo Bancshares 2009 Equity Incentive Plan (2009 Plan) covering officers, employees, directors of, and consultants to, the Company. The 2009 Plan was approved by the Company’s shareholders in May 2009. The 2009 Plan allows for the granting of the following types of “stock awards” (Awards): incentive stock options, nonstatutory stock options, performance awards, restricted stock, restricted stock unit awards and stock appreciation rights. In May 2013, the Company’s shareholders approved an amendment to the 2009 Plan increasing the maximum aggregate number of shares of TriCo’s common stock which may be issued pursuant to or subject to Awards from 650,000 to 1,650,000. The number of shares available for issuance under the 2009 Plan is reduced by: (i) one share for each share of common stock issued pursuant to a stock option or a Stock Appreciation Right and (ii) two shares for each share of common stock issued pursuant to a Performance Award, a Restricted Stock Award or a Restricted Stock Unit Award. When Awards made under the 2009 Plan expire or are forfeited or cancelled, the underlying shares will become available for future Awards under the 2009 Plan. To the extent that a share of common stock pursuant to an Award that counted as two shares against the number of shares again becomes available for issuance under the 2009 Plan, the number of shares of common stock available for issuance under the 2009 Plan shall increase by two shares. Shares awarded and delivered under the 2009 Plan may be authorized but unissued, or reacquired shares. As of September 30, 2013, 710,500 options for the purchase of common shares remain outstanding, and 927,500 remain available for grant, under the 2009 Plan.
	In May 2001, the Company adopted the TriCo Bancshares 2001 Stock Option Plan (2001 Plan) covering officers, employees, directors of, and consultants to, the Company. Under the 2001 Plan, the option exercise price cannot be less than the fair market value of the Common Stock at the date of grant except in the case of substitute options. Options for the 2001 Plan expire on the tenth anniversary of the grant date. Vesting schedules under the 2001 Plan are determined individually for each grant. As of September 30, 2013, 571,170 options for the purchase of common shares remain outstanding under the 2001 Plan. No new options may be granted under the 2001 Plan.
	Stock option activity is summarized in the following table for the time period indicated:
							Weighted		Weighted
							Average		Average Fair
		Number			Option Price		Exercise		Value on
		of Shares			per Share		Price		Date of Grant
	Outstanding at December 31, 2012		1,393,935		$	12.60 to $25.91	$	17.07
	Options granted		144,500		$	16.59 to $19.46	$	19.31	$	8.91
	Options exercised		(248,765	)	$	12.60 to $20.58	$	13.03
	Options forfeited		(8,000	)	$	22.54 to $25.91	$	24.23
	Outstanding at September 30, 2013		1,281,670		$	12.63 to $25.91	$	18.06
	The following table shows the number, weighted-average exercise price, intrinsic value, and weighted average remaining contractual life of options exercisable, options not yet exercisable and total options outstanding as of September 30, 2013:
		Currently			Currently Not		Total
		Exercisable			Exercisable		Outstanding
	Number of options		825,570			456,100		1,281,670
	Weighted average exercise price	$	18.86		$	16.63	$	18.06
	Intrinsic value (in thousands)	$	3,395		$	2,806	$	6,201
	Weighted average remaining contractual term (yrs.)		4			8.5		5.6
	The 456,100 options that are currently not exercisable as of September 30, 2013 are expected to vest, on a weighted-average basis, over the next 3.2 years, and the Company is expected to recognize $2,906,000 of pre-tax compensation costs related to these options as they vest. The Company did not modify any option grants during 2012 or the nine months ended September 30, 2013.

Noninterest_Income_and_Expense

Noninterest Income and Expenses	9 Months Ended
	Sep. 30, 2013
Other Income And Expenses [Abstract]	'
Noninterest Income and Expenses	'
	Note 21 - Noninterest Income and Expenses
	The components of other noninterest income were as follows (in thousands):
		Three months ended						Nine months ended
		September 30,						September 30,
		2013			2012			2013			2012
	Service charges on deposit accounts	$	3,353		$	3,617		$	9,770		$	10,788
	ATM and interchange fees		2,132			1,877			6,240			5,722
	Other service fees		562			567			1,683			1,740
	Mortgage banking service fees		434			403			1,280			1,154
	Change in value of mortgage servicing rights		181			(681	)		311			(1,514	)
	Total service charges and fees		6,662			5,783			19,284			17,890
	Gain on sale of loans		1,083			1,430			4,967			4,317
	Commissions on sale of non-deposit investment products		692			803			2,294			2,464
	Increase in cash value of life insurance		531			450			1,337			1,350
	Change in indemnification asset		(461	)		(94	)		(876	)		215
	Gain on sale of foreclosed assets		313			419			1,479			364
	Sale of customer checks		97			90			280			256
	Lease brokerage income		75			80			273			228
	Gain (loss) on disposal of fixed assets		2			(16	)		(12	)		(404	)
	Commission rebates		—			(17	)		—			(51	)
	Gain on life insurance death benefit		—			—			—			600
	Other		133			199			166			740
	Total other noninterest income		2,465			3,344			10,192			10,079
	Total noninterest income	$	9,127		$	9,127		$	29,476		$	27,969
	The components of noninterest expense were as follows (in thousands):
		Three months ended						Nine months ended
		September 30,						September 30,
		2013			2012			2013			2012
	Base salaries, net of deferred loan origination costs	$	8,716		$	8,337		$	25,572		$	24,769
	Incentive compensation		1,166			1,254			3,751			3,976
	Benefits and other compensation costs		2,979			2,771			9,389			8,869
	Total salaries and benefits expense		12,861			12,362			38,712			37,614
	Occupancy		1,925			1,851			5,337			5,424
	Equipment		1,089			1,138			3,036			3,381
	Data processing and software		1,184			1,017			3,542			3,589
	ATM network charges		626			529			1,801			1,628
	Telecommunications		629			553			1,741			1,675
	Postage		269			230			633			704
	Courier service		217			270			639			715
	Advertising		492			710			1,232			2,071
	Assessments		572			590			1,721			1,786
	Operational losses		137			171			376			430
	Professional fees		741			832			1,885			1,946
	Foreclosed assets expense		48			284			310			1,076
	Provision for foreclosed asset losses		47			433			620			1,520
	Change in reserve for unfunded commitments		(335	)		(35	)		(740	)		(185	)
	Intangible amortization		53			52			157			157
	Legal settlement		339			2,090			339			2,090
	Other		2,722			2,513			7,385			7,251
	Total other noninterest expense		10,755			13,228			30,014			35,258
	Total noninterest expense	$	23,616		$	25,590		$	68,726		$	72,872

Income_Taxes

Income Taxes	9 Months Ended
	Sep. 30, 2013
Income Tax Disclosure [Abstract]	'
Income Taxes	'
	Note 22 - Income Taxes
	The provisions for income taxes applicable to income before taxes differ from amounts computed by applying the statutory Federal income tax rates to income before taxes. The effective tax rate and the statutory federal income tax rate are reconciled for the periods indicated as follows:
		Three months ended September 30,						Nine months ended September 30,
		2013			2012			2013			2012
	Federal statutory income tax rate		35	%		35	%		35	%		35	%
	State income taxes, net of federal tax benefit		6.7	%		6.9	%		6.7	%		6.6	%
	Tax-exempt interest on municipal obligations		(0.5	%)		(0.4	%)		(0.4	%)		(0.5	%)
	Increase in cash value of insurance policies		(1.5	%)		(1.8	%)		(1.3	%)		(2.0	%)
	Other		0.3	%		2.2	%		0.4	%		0.9	%
	Effective Tax Rate		40	%		41.9	%		40.4	%		40	%

Earnings_Per_Share

Earnings Per Share	9 Months Ended
	Sep. 30, 2013
Earnings Per Share [Abstract]	'
Earnings Per Share	'
	Note 23 – Earnings Per Share
	Basic earnings per share represents income available to common shareholders divided by the weighted-average number of common shares outstanding during the period. Diluted earnings per share reflects additional common shares that would have been outstanding if dilutive potential common shares had been issued, as well as any adjustments to income that would result from assumed issuance. Potential common shares that may be issued by the Company relate solely from outstanding stock options, and are determined using the treasury stock method. Earnings per share have been computed based on the following:
		Three months ended				Nine months ended
		September 30,				September 30,
	(in thousands)	2013		2012		2013		2012
	Net income	$	7,361	$	5,020	$	22,163	$	14,272
	Average number of common shares outstanding		16,074		15,993		16,035		15,989
	Effect of dilutive stock options		156		59		117		61
	Average number of common shares outstanding used to calculate diluted earnings per share		16,230		16,052		16,152		16,050
	Options excluded from diluted earnings per share because the effect of these options was antidilutive		171		992		544		967

Comprehensive_Income

Comprehensive Income	9 Months Ended
	Sep. 30, 2013
Equity [Abstract]	'
Comprehensive Income	'
	Note 24 – Comprehensive Income
	Accounting principles generally require that recognized revenue, expenses, gains and losses be included in net income. Although certain changes in assets and liabilities, such as unrealized gains and losses on available-for-sale securities, are reported as a separate component of the equity section of the balance sheet, such items, along with net income, are components of comprehensive income. The components of other comprehensive income and related tax effects are as follows:
		Three months ended						Nine months ended
		September 30,						September, 30
		2013			2012			2013			2012
	(in thousands)
	Unrealized holding gains (losses) on available-for-sale securities	$	144		$	168		$	(3,498	)	$	(304	)
	Tax effect		(61	)		(70	)		1,471			128
	Unrealized holding gains (losses) on available-for-sale securities, net of tax	$	83		$	98		$	(2,027	)	$	(176	)
	The components of accumulated other comprehensive income, included in shareholders’ equity, are as follows:
		September 30,			December 31,
		2013			2012
		(In thousands)
	Net unrealized gains on available-for-sale securities	$	4,936		$	8,434
	Tax effect		(2,076	)		(3,547	)
	Unrealized holding gains on available-for-sale securities, net of tax		2,860			4,887
	Pension liability		(3,806	)		(3,806	)
	Tax effect		1,600			1,600
	Pension liability, net of tax		(2,206	)		(2,206	)
	Joint beneficiary agreement liability		(522	)		(522	)
	Tax effect		—			—
	Joint beneficiary agreement liability, net of tax		(522	)		(522	)
	Accumulated other comprehensive income (loss)	$	132		$	2,159

Retirement_Plans

Retirement Plans	9 Months Ended
	Sep. 30, 2013
Compensation And Retirement Disclosure [Abstract]	'
Retirement Plans	'
	Note 25 - Retirement Plans
	The Company has supplemental retirement plans for current and former directors and key executives. These plans are non-qualified defined benefit plans and are unsecured and unfunded. The Company has purchased insurance on the lives of the participants and intends (but is not required) to use the cash values of these policies to pay the retirement obligations. The following table sets forth the net periodic benefit cost recognized for the plans:
		Three months ended				Nine months ended
	(In thousands)	September 30,				September 30,
		2013		2012		2013		2013
	Net pension cost included the following components:
	Service cost-benefits earned during the period	$	187	$	170	$	557	$	510
	Interest cost on projected benefit obligation		161		172		482		515
	Amortization of net obligation at transition		—		—		1		1
	Amortization of prior service cost		39		38		115		115
	Recognized net actuarial loss		73		72		218		216
	Net periodic pension cost	$	460	$	452	$	1,373	$	1,357
	Company contributions to pension plans	$	151	$	106	$	411	$	366
	Pension plan payouts to participants	$	151	$	106	$	411	$	366
	For the year ending December 31, 2013, the Company currently expects to contribute and pay out as benefits $537,000 to participants under the plans.

Related_Party_Transactions

Related Party Transactions	9 Months Ended
	Sep. 30, 2013
Related Party Transactions [Abstract]	'
Related Party Transactions	'
	Note 26 - Related Party Transactions
	Certain directors, officers, and companies with which they are associated were customers of, and had banking transactions with, the Company or the Bank in the ordinary course of business.
	The following table summarizes the activity in these loans for the periods indicated (in thousands):
	Balance December 31, 2011	$	1,764
	Advances/new loans		1,568
	Removed/payments		(964	)
	Balance December 31, 2012	$	2,368
	Advances/new loans		277
	Removed/payments		(1,071	)
	Balance September 30, 2013	$	1,574
	Director Chrysler is a principal owner and CEO of Modern Building Inc. Modern Building Inc. provided construction services to Tri Counties Bank related to new and existing Bank facilities for aggregate payments of $3,075,000 during the nine months ended September 30, 2013 and $3,924,000 during the year ended December 31, 2012.

Fair_Value_Measurement

Fair Value Measurement	9 Months Ended
	Sep. 30, 2013
Fair Value Disclosures [Abstract]	'
Fair Value Measurement	'
	Note 27 - Fair Value Measurement
	The Company utilizes fair value measurements to record fair value adjustments to certain assets and liabilities and to determine fair value disclosures. In estimating fair value, the Company utilizes valuation techniques that are consistent with the market approach, income approach, and/or the cost approach. Inputs to valuation techniques include the assumptions that market participants would use in pricing an asset or liability including assumptions about the risk inherent in a particular valuation technique, the effect of a restriction on the sale or use of an asset and the risk of nonperformance. Securities available-for-sale and mortgage servicing rights are recorded at fair value on a recurring basis. Additionally, from time to time, the Company may be required to record at fair value other assets on a nonrecurring basis, such as loans held for sale, loans held for investment and certain other assets. These nonrecurring fair value adjustments typically involve application of lower of cost or market accounting or impairment write-downs of individual assets.
	The Company groups assets and liabilities at fair value in three levels, based on the markets in which the assets and liabilities are traded and the observable nature of the assumptions used to determine fair value. These levels are:
	Level 1 -	Valuation is based upon quoted prices for identical instruments traded in active markets.
	Level 2 -	Valuation is based upon quoted prices for similar instruments in active markets, quoted prices for identical or similar instruments in markets that are not active, and model-based valuation techniques for which all significant assumptions are observable in the market.
	Level 3 -	Valuation is generated from model-based techniques that use at least one significant assumption not observable in the market. These unobservable assumptions reflect estimates of assumptions that market participants would use in pricing the asset or liability. Valuation techniques include use of option pricing models, discounted cash flow models and similar techniques.
	Investment Securities available for sale – Investment securities available for sale are recorded at fair value on a recurring basis. Fair value measurement is based upon quoted prices, if available. If quoted prices are not available, fair values are measured using independent pricing models or other model-based valuation techniques such as the present value of future cash flows, adjusted for the security’s credit rating, prepayment assumptions and other factors such as credit loss assumptions. Level 1 securities include those traded on an active exchange, such as the New York Stock Exchange, U.S. Treasury securities that are traded by dealers or brokers in active over-the-counter markets and money market funds. Level 2 securities include mortgage-backed securities issued by government sponsored entities, municipal bonds and corporate debt securities. The Company had no securities classified as Level 3 during any of the periods covered in these financial statements.
	Loans held for sale – Loans held for sale are carried at the lower of cost or fair value. The fair value of loans held for sale is based on what secondary markets are currently offering for loans with similar characteristics. As such, we classify those loans subjected to nonrecurring fair value adjustments as Level 2.
	Impaired originated and PNCI loans – Originated and PNCI loans are not recorded at fair value on a recurring basis. However, from time to time, an originated or PNCI loan is considered impaired and an allowance for loan losses is established. Originated and PNCI loans for which it is probable that payment of interest and principal will not be made in accordance with the contractual terms of the loan agreement are considered impaired. The fair value of an impaired originated or PNCI loan is estimated using one of several methods, including collateral value, fair value of similar debt, enterprise value, liquidation value and discounted cash flows. Those impaired originated and PNCI loans not requiring an allowance represent loans for which the fair value of the expected repayments or collateral exceed the recorded investments in such loans. Impaired originated and PNCI loans where an allowance is established based on the fair value of collateral require classification in the fair value hierarchy. When the fair value of the collateral is based on an observable market price or a current appraised value which uses substantially observable data, the Company records the impaired originated or PNCI loan as nonrecurring Level 2. When an appraised value is not available or management determines the fair value of the collateral is further impaired below the appraised value, or the appraised value contains a significant unobservable assumption, such as deviations from comparable sales, and there is no observable market price, the Company records the impaired originated or PNCI loan as nonrecurring Level 3.
	Foreclosed assets - Foreclosed assets include assets acquired through, or in lieu of, loan foreclosure. Foreclosed assets are held for sale and are initially recorded at fair value at the date of foreclosure, establishing a new cost basis. Subsequent to foreclosure, management periodically performs valuations and the assets are carried at the lower of carrying amount or fair value less cost to sell. When the fair value of foreclosed assets is based on an observable market price or a current appraised value which uses substantially observable data, the Company records the impaired originated loan as nonrecurring Level 2. When an appraised value is not available or management determines the fair value of the collateral is further impaired below the appraised value, or the appraised value contains a significant unobservable assumption, such as deviations from comparable sales, and there is no observable market price, the Company records the foreclosed asset as nonrecurring Level 3. Revenue and expenses from operations and changes in the valuation allowance are included in other noninterest expense.
	Mortgage servicing rights - Mortgage servicing rights are carried at fair value. A valuation model, which utilizes a discounted cash flow analysis using a discount rate and prepayment speed assumptions is used in the computation of the fair value measurement. While the prepayment speed assumption is currently quoted for comparable instruments, the discount rate assumption currently requires a significant degree of management judgment and is therefore considered an unobservable input. As such, the Company classifies mortgage servicing rights subjected to recurring fair value adjustments as Level 3. Additional information regarding mortgage servicing rights can be found in Note 10 in these consolidated financial statements.
	The table below presents the recorded amount of assets and liabilities measured at fair value on a recurring basis (in thousands):
	Fair value at September 30, 2013	Total		Level 1			Level 2				Level 3
	Investment securities available for sale:
	Obligations of U.S. government corporations and agencies	$	105,401		—		$	105,401				—
	Obligations of states and political subdivisions		7,905		—			7,905				—
	Corporate debt securities		1,909		—			1,909				—
	Mortgage servicing rights		6,049		—			—			$	6,049
	Total assets measured at fair value	$	121,264				$	115,215			$	6,049
	Fair value at December 31, 2012	Total		Level 1			Level 2				Level 3
	Investment securities available for sale:
	Obligations of U.S. government corporations and agencies	$	151,701		—		$	151,701				—
	Obligations of states and political subdivisions		9,421		—			9,421				—
	Corporate debt securities		1,905		—			1,905				—
	Mortgage servicing rights		4,552		—			—			$	4,552
	Total assets measured at fair value	$	167,579		—		$	163,027			$	4,552
	Transfers between levels of the fair value hierarchy are recognized on the actual date of the event or circumstances that caused the transfer, which generally corresponds with the Company’s quarterly valuation process. There were no transfers between any levels during the nine months ended September 30, 2013 or the year ended December 31, 2012.
	The following tables provide a reconciliation of assets and liabilities measured at fair value using significant unobservable inputs (Level 3) on a recurring basis during the three and nine months ended September 30, 2013 and 2012. Had there been any transfer into or out of Level 3 during 2013 or 2012, the amount included in the “Transfers into (out of) Level 3” column would represent the beginning balance of an item in the period (interim quarter) during which it was transferred (in thousands):
							Change
		Beginning		Transfers			Included						Ending
	Three months ended September 30,	Balance		into Level 3			in Earnings				Issuances		Balance
	2013: Mortgage servicing rights	$	5,571		—		$	180			$	298	$	6,049
	2012: Mortgage servicing rights	$	4,757		—		$	(681	)		$	409	$	4,485
							Change
		Beginning		Transfers			Included						Ending
	Nine months ended September 30,	Balance		into Level 3			in Earnings				Issuances		Balance
	2013: Mortgage servicing rights	$	4,552		—		$	310			$	1,187	$	6,049
	2012: Mortgage servicing rights	$	4,603		—		$	(1,513	)		$	1,395	$	4,485
	The Company’s method for determining the fair value of mortgage servicing rights is described in Note 1. The key unobservable inputs used in determining the fair value of mortgage servicing rights are mortgage prepayment speeds and the discount rate used to discount cash projected cash flows. Generally, any significant increases in the mortgage prepayment speed and discount rate utilized in the fair value measurement of the mortgage servicing rights will result in a negative fair value adjustments (and decrease in the fair value measurement). Conversely, a decrease in the mortgage prepayment speed and discount rate will result in a positive fair value adjustment (and increase in the fair value measurement). Note 10 contains additional information regarding mortgage servicing rights.
	The following table presents quantitative information about recurring Level 3 fair value measurements at September 30, 2013:
		Fair Value		Valuation			Unobservable		Range,
		(in thousands)		Technique			Inputs		Weighted Average
	Mortgage Servicing Rights	$	6,049		Discounted cash flow		Constant prepayment rate			6.9% - 33.0%, 11.0%
							Discount rate			10.0% - 10.0%, 10.0%
	The tables below present the recorded amount of assets and liabilities measured at fair value on a nonrecurring basis, as of the dates indicated, that had a write-down or an additional allowance provided during the periods indicated (in thousands):
	September 30, 2013	Total		Level 1			Level 2				Level 3
	Fair value:
	Impaired Originated & PNCI loans	$	22,638		—			—			$	22,638
	Foreclosed assets		2,049		—			—				2,049
	Total assets measured at fair value	$	24,687		—			—			$	24,687
	September 30, 2012	Total		Level 1			Level 2				Level 3
	Fair value:
	Impaired Originated & PNCI loans	$	18,241		—			—			$	18,241
	Foreclosed assets		10,185		—			—				10,185
	Total assets measured at fair value	$	28,426		—			—			$	28,426
	The following table presents the losses resulting from nonrecurring fair value adjustments that occurred in the periods indicated:
		Three months ended					Nine months ended
		September 30,					September 30,
	(in thousands)	2013		2012			2013				2012
	Impaired Originated & PNCI loans	$	258	$	655		$	2,836			$	1,317
	Foreclosed assets		—		433			531				1,520
	Total loss from nonrecurring fair value adjustments	$	258	$	1,088		$	3,367			$	2,837
	The impaired Originated and PNCI loan amount above represents impaired, collateral dependent loans that have been adjusted to fair value. When we identify a collateral dependent loan as impaired, we measure the impairment using the current fair value of the collateral, less selling costs. Depending on the characteristics of a loan, the fair value of collateral is generally estimated by obtaining external appraisals. If we determine that the value of the impaired loan is less than the recorded investment in the loan, we recognize this impairment and adjust the carrying value of the loan to fair value through the allowance for loan and lease losses. The loss represents charge-offs or impairments on collateral dependent loans for fair value adjustments based on the fair value of collateral. The carrying value of loans fully charged-off is zero.
The foreclosed assets amount above represents impaired real estate that has been adjusted to fair value. Foreclosed assets represent real estate which the Bank has taken control of in partial or full satisfaction of loans. At the time of foreclosure, other real estate owned is recorded at the lower of the carrying amount of the loan or fair value less costs to sell, which becomes the property’s new basis. Any write-downs based on the asset’s fair value at the date of acquisition are charged to the allowance for loan and lease losses. After foreclosure, management periodically performs valuations such that the real estate is carried at the lower of its new cost basis or fair value, net of estimated costs to sell. Fair value adjustments on other real estate owned are recognized within net loss on real estate owned. The loss represents impairments on non-covered other real estate owned for fair value adjustments based on the fair value of the real estate.
The Company’s property appraisals are primarily based on the sales comparison approach and income approach methodologies, which consider recent sales of comparable properties, including their income generating characteristics, and then make adjustments to reflect the general assumptions that a market participant would make when analyzing the property for purchase. These adjustments may increase or decrease an appraised value and can vary significantly depending on the location, physical characteristics and income producing potential of each property. Additionally, the quality and volume of market information available at the time of the appraisal can vary from period to period and cause significant changes to the nature and magnitude of comparable sale adjustments. Given these variations, comparable sale adjustments are generally not a reliable indicator for how fair value will increase or decrease from period to period. Under certain circumstances, management discounts are applied based on specific characteristics of an individual property.
The following table presents quantitative information about Level 3 fair value measurements for financial instruments measured at fair value on a nonrecurring basis at September 30, 2013:
	Fair Value		Valuation		Unobservable	Range,
	(in thousands)		Technique		Inputs	Weighted Average
Impaired Originated & PNCI Loans	$	22,638	Sales comparison		Adjustment for differences		5.0% - 41.0%, 9.33%
			approach Income		between comparable sales		6.7% - 9.00%, 8.99%
			approach		Capitalization rate
Foreclosed assets	$	2,049	Sales comparison		Adjustment for differences		5.0% - 5.0%, 5.0%
			approach		between comparable sales
In addition to the methods and assumptions used to estimate the fair value of each class of financial instrument noted above, the following methods and assumptions were used to estimate the fair value of other classes of financial instruments for which it is practical to estimate the fair value.
Short-term Instruments - Cash and due from banks, fed funds purchased and sold, interest receivable and payable, and short-term borrowings are considered short-term instruments. For these short-term instruments their carrying amount approximates their fair value.
Restricted Equity Securities - The carrying value of restricted equity securities approximates fair value as the shares can only be redeemed by the issuing institution at par.
Originated and PNCI loans - The fair value of variable rate originated and PNCI loans is the current carrying value. The interest rates on these originated and PNCI loans are regularly adjusted to market rates. The fair value of other types of fixed rate originated and PNCI loans is estimated by discounting the future cash flows using current rates at which similar loans would be made to borrowers with similar credit ratings for the same remaining maturities. The allowance for loan losses is a reasonable estimate of the valuation allowance needed to adjust computed fair values for credit quality of certain originated and PNCI loans in the portfolio.
PCI Loans - PCI loans are measured at estimated fair value on the date of acquisition. Carrying value is calculated as the present value of expected cash flows and approximates fair value.
FDIC Indemnification Asset - The fair value of the FDIC indemnification asset is based on the discounted value of expected future cash flows under the loss-share agreement.
Deposit Liabilities - The fair value of demand deposits, savings accounts, and certain money market deposits is the amount payable on demand at the reporting date. These values do not consider the estimated fair value of the Company’s core deposit intangible, which is a significant unrecognized asset of the Company. The fair value of time deposits and other borrowings is based on the discounted value of contractual cash flows.
Other Borrowings - The fair value of other borrowings is calculated based on the discounted value of the contractual cash flows using current rates at which such borrowings can currently be obtained.
Junior Subordinated Debentures - The fair value of junior subordinated debentures is estimated using a discounted cash flow model. The future cash flows of these instruments are extended to the next available redemption date or maturity date as appropriate based upon the spreads of recent issuances or quotes from brokers for comparable bank holding companies compared to the contractual spread of each junior subordinated debenture measured at fair value.
Commitments to Extend Credit and Standby Letters of Credit - The fair value of commitments is estimated using the fees currently charged to enter into similar agreements, taking into account the remaining terms of the agreements and the present credit worthiness of the counter parties. For fixed rate loan commitments, fair value also considers the difference between current levels of interest rates and the committed rates. The fair value of letters of credit is based on fees currently charged for similar agreements or on the estimated cost to terminate them or otherwise settle the obligation with the counter parties at the reporting date.
Fair values for financial instruments are management’s estimates of the values at which the instruments could be exchanged in a transaction between willing parties. These estimates are subjective and may vary significantly from amounts that would be realized in actual transactions. In addition, other significant assets are not considered financial assets including, any mortgage banking operations, deferred tax assets, and premises and equipment. Further, the tax ramifications related to the realization of the unrealized gains and losses can have a significant effect on the fair value estimates and have not been considered in any of these estimates.
The estimated fair values of financial instruments that are reported at amortized cost in the Corporation’s consolidated balance sheets, segregated by the level of the valuation inputs within the fair value hierarchy utilized to measure fair value, were as follows (in thousands):
	September 30, 2013					December 31, 2012
	Carrying		Fair			Carrying				Fair
	Amount		Value			Amount				Value
Financial assets:
Level 1 inputs:
Cash and due from banks	$	69,173	$	69,173		$	81,086			$	81,086
Cash at Federal Reserve and other banks		471,977		471,977			667,813				667,813
Level 2 inputs:471,977
Restricted equity securities		9,163		9,163			9,647				9,647
Loans held for sale		3,247		3,247			12,053				12,053
Accrued interest receivable		6,450		6,450			6,636				6,636
Level 3 inputs:
Loans, net		1,617,711		1,714,658			1,522,175				1,607,044
Indemnification asset		861		861			1,997				1,997
Financial liabilities:
Level 2 inputs:
Deposits		2,293,311		2,294,425			2,289,702				2,291,841
Accrued interest payable		937		937			1,036				1,036
Other borrowings		14,626		14,626			9,197				9,197
Junior subordinated debt		41,238		25,980			41,238				28,042
	Contract		Fair			Contract				Fair
	Amount		Value			Amount				Value
Off-balance sheet:
Level 3 inputs:
Commitments	$	530,417	$	5,304		$	557,254			$	5,573
Standby letters of credit		2,013		20			2,905				29
Overdraft privilege commitments		70,424		704			69,675				697

TriCo_Bancshares_Condensed_Fin

TriCo Bancshares Condensed Financial Statements (Parent Only)	9 Months Ended
	Sep. 30, 2013
Condensed Financial Information Of Parent Company Only Disclosure [Abstract]	'
TriCo Bancshares Condensed Financial Statements (Parent Only)	'
	Note 28 - TriCo Bancshares Condensed Financial Statements (Parent Only)
	Condensed Balance Sheets							September 30,			December 31,
								2013			2012
								(In thousands)
	Assets
	Cash and Cash equivalents							$	2,489		$	2,511
	Investment in Tri Counties Bank								283,228			267,118
	Other assets								1,238			1,238
	Total assets							$	286,955		$	270,867
	Liabilities and shareholders’ equity
	Other liabilities							$	265		$	270
	Junior subordinated debt								41,238			41,238
	Total liabilities								41,503			41,508
	Shareholders’ equity:
	Common stock, no par value: authorized 50,000,000 shares; issued and outstanding 16,076,662 and 16,000,838 shares, respectively								89,054			85,561
	Retained earnings								156,266			141,639
	Accumulated other comprehensive loss, net								132			2,159
	Total shareholders’ equity								245,452			229,359
	Total liabilities and shareholders’ equity							$	286,955		$	270,867
	Statements of Income	Three months ended Sept. 30,						Nine months ended Sept. 30,
	(In thousands)	2013			2012			2013			2012
	Interest expense	$	314		$	333		$	936		$	1,003
	Administration expense		191			131			568			445
	Loss before equity in net income of Tri Counties Bank		(505	)		(464	)		(1,504	)		(1,448	)
	Equity in net income of Tri Counties Bank:
	Distributed		2,300			1,550			6,080			6,872
	(Over) under distributed		5,354			3,739			16,955			8,244
	Income tax benefit		212			195			632			604
	Net income	$	7,361		$	5,020		$	22,163		$	14,272
	Statements of Comprehensive Income	Three months ended Sept. 30,						Nine months ended Sept. 30,
	(In thousands)	2013			2012			2013			2012
	Net income	$	7,361		$	5,020		$	22,163		$	14,272
	Other comprehensive income, net of tax:
	Unrealized holding gains (losses) on securities arising during the period		83			98			(2,027	)		(176	)
	Other comprehensive loss		83			98			(2,027	)		(176	)
	Comprehensive income	$	7,444		$	5,118		$	20,136		$	14,096
	Statements of Cash Flows							Nine months ended Sept. 30,
	(In thousands)							2013			2012
	Operating activities:
	Net income							$	22,163		$	14,272
	Adjustments to reconcile net income to net cash provided by operating activities:
	Over (under) distributed equity in earnings of Tri Counties Bank								(16,955	)		(8,244	)
	Stock option vesting expense								849			800
	Stock option excess tax benefits								(356	)		(21	)
	Net change in other assets and liabilities								(853	)		(747	)
	Net cash provided by operating activities								4,848			6,060
	Investing activities: None
	Financing activities:
	Issuance of common stock through option exercise								356			156
	Stock option excess tax benefits								251			21
	Repurchase of common stock								(501	)		(48	)
	Cash dividends paid — common								(4,976	)		(4,317	)
	Net cash used for financing activities								(4,870	)		(4,188	)
	(Decrease) increase in cash and cash equivalents								(22	)		1,872
	Cash and cash equivalents at beginning of year								2,511			706
	Cash and cash equivalents at end of year							$	2,489		$	2,578

Regulatory_Matters

Regulatory Matters	9 Months Ended
	Sep. 30, 2013
Banking And Thrift [Abstract]	'
Regulatory Matters	'
	Note 29 - Regulatory Matters
	The Company is subject to various regulatory capital requirements administered by federal banking agencies. Failure to meet minimum capital requirements can initiate certain mandatory, and possibly additional discretionary actions by regulators that, if undertaken, could have a direct material effect on the Company’s consolidated financial statements. Under capital adequacy guidelines and the regulatory framework for prompt corrective action, the Company must meet specific capital guidelines that involve quantitative measures of the Company’s assets, liabilities and certain off-balance-sheet items as calculated under regulatory accounting practices. The Company’s capital amounts and classification are also subject to qualitative judgments by the regulators about components, risk weightings and other factors.
	Quantitative measures established by regulation to ensure capital adequacy require the Company to maintain minimum amounts and ratios (set forth in the table below) of total and Tier 1 capital to risk-weighted assets, and of Tier 1 capital to average assets. Management believes, as of September 30, 2013, that the Company meets all capital adequacy requirements to which it is subject.
	As of September 30, 2013, the Bank’s regulatory capital ratios exceeded the minimums for the Bank to be considered well capitalized under the regulatory framework for prompt corrective action. To be categorized as well capitalized the Bank must maintain minimum total risk-based, Tier 1 risk-based and Tier 1 leverage ratios as set forth in the table below. The Bank’s actual capital amounts and ratios are also presented in the table.
												Minimum to be Well
												Capitalized Under
							Minimum					Prompt Corrective
		Actual					Capital Requirement					Action Provisions
		Amount		Ratio			Amount		Ratio			Amount		Ratio
		(dollars in thousands)
	As of September 30, 2013:
	Total Capital (to Risk Weighted Assets):
	Consolidated	$	293,093		14.88	%	$	157,533		8	%		N/A		N/A
	Tri Counties Bank	$	290,852		14.78	%	$	157,432		8	%	$	196,916		10	%
	Tier 1 Capital (to Risk Weighted Assets):
	Consolidated	$	268,261		13.62	%	$	78,766		4	%		N/A		N/A
	Tri Counties Bank	$	266,036		13.52	%	$	78,716		4	%	$	118,149		6	%
	Tier 1 Capital (to Average Assets):
	Consolidated	$	268,261		10.37	%	$	103,447		4	%		N/A		N/A
	Tri Counties Bank	$	266,036		10.29	%	$	103,395		4	%	$	129,309		5	%
	As of December 31, 2012:
	Total Capital (to Risk Weighted Assets):
	Consolidated	$	273,979		14.53	%	$	150,896		8	%		N/A		N/A
	Tri Counties Bank	$	271,723		14.42	%	$	150,796		8	%	$	188,495		10	%
	Tier 1 Capital (to Risk Weighted Assets):
	Consolidated	$	250,133		13.27	%	$	75,448		4	%		N/A		N/A
	Tri Counties Bank	$	247,892		13.16	%	$	75,398		4	%	$	113,097		6	%
	Tier 1 Capital (to Average Assets):
	Consolidated	$	250,133		9.82	%	$	101,918		4	%		N/A		N/A
	Tri Counties Bank	$	247,892		9.73	%	$	101,866		4	%	$	127,333		5	%

Summary_of_Quarterly_Results_o

Summary of Quarterly Results of Operations (unaudited)	9 Months Ended
	Sep. 30, 2013
Quarterly Financial Information Disclosure [Abstract]	'
Summary of Quarterly Results of Operations (unaudited)	'
	Note 30 - Summary of Quarterly Results of Operations (unaudited)
	The following table sets forth the results of operations for the quarters of 2013 and 2012, and is unaudited; however, in the opinion of Management, it reflects all adjustments (which include only normal recurring adjustments) necessary to present fairly the summarized results for such periods.
		2013 Quarters Ended
		December 31,		September 30,			June 30,		March 31,
		(In thousands, except per share data)
	Interest and dividend income:
	Loans:
	Discount accretion PCI – cash basis			$	140		$	129	$	167
	Discount accretion PCI – other				898			732		597
	Discount accretion PNCI				1,115			815		766
	All other loan interest income				22,970			22,207		22,542
	Total loan interest income				25,123			23,883		24,072
	Debt securities, dividends and interest bearing cash at Banks (not FTE)				2,413			1,873		1,734
	Total interest income				27,536			25,756		25,806
	Interest expense				1,169			1,167		1,237
	Net interest income				26,367			24,589		24,569
	Reversal of provision for loan losses				(393	)		614		(1,108	)
	Net interest income after provision for loan losses				26,760			23,975		25,677
	Noninterest income				9,127			10,131		10,218
	Noninterest expense				23,616			23,509		21,601
	Income before income taxes				12,271			10,597		14,294
	Income tax expense				4,910			4,272		5,817
	Net income			$	7,361		$	6,325	$	8,477
	Per common share:
	Net income (diluted)			$	0.45		$	0.39	$	0.53
	Dividends			$	0.11		$	0.11	$	0.09
		2012 Quarters Ended
		December 31,		September 30,			June 30,		March 31,
		(In thousands, except per share data)
	Interest and dividend income:
	Loans:
	Discount accretion PCI – cash basis	$	42	$	24		$	108	$	18
	Discount accretion PCI – other		979		1,192			886		776
	Discount accretion PNCI		841		591			1,391		1,286
	All other loan interest income		22,383		23,723			23,407		22,849
	Total loan interest income		24,245		25,530			25,792		24,929
	Debt securities, dividends and interest bearing cash at Banks (not FTE)		1,898		1,935			2,152		2,235
	Total interest income		26,143		27,465			27,944		27,164
	Interest expense		1,372		1,834			2,010		2,128
	Net interest income		24,771		25,631			25,934		25,036
	Provision for loan losses		1,524		532			3,371		3,996
	Net interest income after provision for loan losses		23,247		25,099			22,563		21,040
	Noninterest income		10,011		9,127			10,577		8,265
	Noninterest expense		25,126		25,590			24,367		22,915
	Income before income taxes		8,132		8,636			8,773		6,390
	Income tax expense		3,410		3,616			3,452		2,459
	Net income	$	4,722	$	5,020		$	5,321	$	3,931
	Per common share:
	Net income (diluted)	$	0.29	$	0.31		$	0.33	$	0.25
	Dividends	$	0.09	$	0.09		$	0.09	$	0.09

Summary_of_Significant_Account1

Summary of Significant Accounting Policies (Policies)	9 Months Ended
	Sep. 30, 2013
Accounting Policies [Abstract]	'
Description of Business	'
	Description of Business
	TriCo Bancshares is a California corporation organized to act as a bank holding company for Tri Counties Bank (the “Bank”). The Bank is a state-chartered financial institution that is engaged in the general commercial banking business in the California counties of Butte, Contra Costa, Del Norte, Fresno, Glenn, Kern, Lake, Lassen, Madera, Mendocino, Merced, Napa, Nevada, Placer, Sacramento, Shasta, Siskiyou, Stanislaus, Sutter, Tehama, Tulare, Yolo and Yuba. Tri Counties Bank currently operates from 41 traditional branches and 24 in-store branches. The Company also formed two subsidiary business trusts, TriCo Capital Trust I and TriCo Capital Trust II (collectively, the Trusts), to issue trust preferred securities.
Basis of Presentation	'
	Basis of Presentation
	The following unaudited condensed financial statements of the Company have been prepared pursuant to the rules and regulations of the Securities and Exchange Commission. Certain information and note disclosures normally included in annual financial statements prepared in accordance with generally accepted accounting principles have been condensed or omitted pursuant to those rules and regulations, although the Company believes that the disclosures made are adequate to make the information not misleading. In the opinion of Management, all adjustments, consisting solely of normal recurring adjustments, considered necessary for a fair presentation of results for the interim periods presented have been included. These interim condensed consolidated financial statements should be read in conjunction with the financial statements and related notes contained in the Company’s 2012 Annual Report on Form 10-K filed with the Securities and Exchange Commission on March 18, 2013.
	The condensed consolidated financial statements include the accounts of the Company and its wholly-owned financial subsidiary, Tri Counties Bank. All significant intercompany balances and transactions have been eliminated. TriCo Capital Trust I and TriCo Capital Trust II, which were formed solely for the purpose of issuing trust preferred securities, are unconsolidated subsidiaries as the Company is not the primary beneficiary of the trusts and they are not considered variable interest entities. Operating results for the three and nine months ended September 30, 2013 are not necessarily indicative of the results that may be expected for the year ending December 31, 2013. Certain amounts in the consolidated financial statements for the year ended December 31, 2012 and for the three and nine months ended September 30, 2012 may have been reclassified to conform to the presentation of the condensed consolidated financial statements in 2013.
Use of Estimates in the Preparation of Financial Statements	'
	Use of Estimates in the Preparation of Financial Statements
	The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America requires Management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. On an on-going basis, the Company evaluates its estimates, including those related to the adequacy of the allowance for loan losses, investments, intangible assets, income taxes and contingencies. The Company bases its estimates on historical experience and on various other assumptions that are believed to be reasonable under the circumstances, the results of which form the basis for making judgments about the carrying values of assets and liabilities that are not readily apparent from other sources. Actual results may differ from these estimates under different assumptions or conditions. The allowance for loan losses, indemnification asset, foreclosed assets, goodwill and other intangible assets, income taxes, fair value of assets acquired and liabilities assumed in business combinations, the valuation of securities available-for-sale, and the valuation of mortgage servicing rights are the only accounting estimates that materially affect the Company’s consolidated financial statements.
	As described in Note 2, the Bank assumed the banking operations of two failed financial institutions from the FDIC under whole bank purchase agreements. The acquired assets and assumed liabilities were measured at estimated fair value values under the acquisition method of accounting. The Company made significant estimates and exercised significant judgment in accounting for the acquisitions. The Company determined loan fair values based on loan file reviews, loan risk ratings, appraised collateral values, expected cash flows and historical loss factors. Foreclosed assets were primarily valued based on appraised values of the repossessed loan collateral. An identifiable intangible was also recorded representing the fair value of the core deposit customer base based on an evaluation of the cost of such deposits relative to alternative funding sources. The fair value of time deposits and borrowings were determined based on the present value of estimated future cash flows using current rates as of the acquisition date.
Significant Group Concentration of Credit Risk	'
	Significant Group Concentration of Credit Risk
	The Company grants agribusiness, commercial, consumer, and residential loans to customers located throughout the northern San Joaquin Valley, the Sacramento Valley and northern mountain regions of California. The Company has a diversified loan portfolio within the business segments located in this geographical area. The Company currently classifies all its operation into one business segment that it denotes as community banking.
Cash and Cash Equivalents	'
	Cash and Cash Equivalents
	For purposes of the consolidated statements of cash flows, cash and cash equivalents include cash on hand, amounts due from banks, and federal funds sold. Net cash flows are reported for loan and deposit transactions and other borrowings.
Investment Securities	'
	Investment Securities
	The Company classifies its debt and marketable equity securities into one of three categories: trading, available for sale or held to maturity. Trading securities are bought and held principally for the purpose of selling in the near term. Held to maturity securities are those securities which the Company has the ability and intent to hold until maturity. These securities are carried at cost adjusted for amortization of premium and accretion of discount, computed by the effective interest method over their contractual lives. All other securities not included in trading or held to maturity are classified as available for sale. Available for sale securities are recorded at fair value. Unrealized gains and losses, net of the related tax effect, on available for sale securities are reported as a separate component of other accumulated comprehensive income in shareholders’ equity until realized. Premiums and discounts are amortized or accreted over the life of the related investment security as an adjustment to yield using the effective interest method. Dividend and interest income are recognized when earned. Realized gains and losses are derived from the amortized cost of the security sold. During the nine months ended September 30, 2013, and the year ended December 31, 2012, the Company did not have any securities classified as trading. During the three months ended March 31, 2013, and the year ended December 31, 2012, the Company did not have any securities classified as held to maturity.
	The Company assesses other-than-temporary impairment (“OTTI”) based on whether it intends to sell a security or if it is likely that the Company would be required to sell the security before recovery of the amortized cost basis of the investment, which may be maturity. For debt securities, if we intend to sell the security or it is likely that we will be required to sell the security before recovering its cost basis, the entire impairment loss would be recognized in earnings as an OTTI. If we do not intend to sell the security and it is not likely that we will be required to sell the security but we do not expect to recover the entire amortized cost basis of the security, only the portion of the impairment loss representing credit losses would be recognized in earnings. The credit loss on a security is measured as the difference between the amortized cost basis and the present value of the cash flows expected to be collected. Projected cash flows are discounted by the original or current effective interest rate depending on the nature of the security being measured for potential OTTI. The remaining impairment related to all other factors, the difference between the present value of the cash flows expected to be collected and fair value, is recognized as a charge to other comprehensive income (“OCI”). Impairment losses related to all other factors are presented as separate categories within OCI. The accretion of the amount recorded in OCI increases the carrying value of the investment and does not affect earnings. If there is an indication of additional credit losses the security is re-evaluated according to the procedures described above. No OTTI losses were recognized during the nine months ended September 30, 2013, and the year ended December 31, 2012.
Restricted Equity Securities	'
	Restricted Equity Securities
	Restricted equity securities represent the Company’s investment in the stock of the Federal Home Loan Bank of San Francisco (“FHLB”) and are carried at par value, which reasonably approximates its fair value. While technically these are considered equity securities, there is no market for the FHLB stock. Therefore, the shares are considered as restricted investment securities. Management periodically evaluates FHLB stock for other-than-temporary impairment. Management’s determination of whether these investments are impaired is based on its assessment of the ultimate recoverability of cost rather than by recognizing temporary declines in value. The determination of whether a decline affects the ultimate recoverability of cost is influenced by criteria such as (1) the significance of any decline in net assets of the FHLB as compared to the capital stock amount for the FHLB and the length of time this situation has persisted, (2) commitments by the FHLB to make payments required by law or regulation and the level of such payments in relation to the operating performance of the FHLB, (3) the impact of legislative and regulatory changes on institutions and, accordingly, the customer base of the FHLB, and (4) the liquidity position of the FHLB.
	As a member of the FHLB system, the Company is required to maintain a minimum level of investment in FHLB stock based on specific percentages of its outstanding mortgages, total assets, or FHLB advances. The Company may request redemption at par value of any stock in excess of the minimum required investment. Stock redemptions are at the discretion of the FHLB.
Loans Held for Sale	'
	Loans Held for Sale
	Loans originated and intended for sale in the secondary market are carried at the lower of aggregate cost or fair value, as determined by aggregate outstanding commitments from investors of current investor yield requirements. Net unrealized losses are recognized through a valuation allowance by charges to noninterest income.
	Mortgage loans held for sale are generally sold with the mortgage servicing rights retained by the Company. Gains or losses on the sale of loans that are held for sale are recognized at the time of the sale and determined by the difference between net sale proceeds and the net book value of the loans less the estimated fair value of any retained mortgage servicing rights.
Loans and Allowance for Loan Losses	'
	Loans and Allowance for Loan Losses
	Loans originated by the Company, i.e., not purchased or acquired in a business combination, are referred to as originated loans. Originated loans that management has the intent and ability to hold for the foreseeable future or until maturity or payoff are reported at the principal amount outstanding, net of deferred loan fees and costs. Loan origination and commitment fees and certain direct loan origination costs are deferred, and the net amount is amortized as an adjustment of the related loan’s yield over the actual life of the loan. Originated loans on which the accrual of interest has been discontinued are designated as nonaccrual loans.
	Originated loans are placed in nonaccrual status when reasonable doubt exists as to the full, timely collection of interest or principal, or a loan becomes contractually past due by 90 days or more with respect to interest or principal and is not well secured and in the process of collection. When an originated loan is placed on nonaccrual status, all interest previously accrued but not collected is reversed. Income on such loans is then recognized only to the extent that cash is received and where the future collection of principal is probable. Interest accruals are resumed on such loans only when they are brought fully current with respect to interest and principal and when, in the judgment of Management, the loan is estimated to be fully collectible as to both principal and interest.
	An allowance for loan losses for originated loans is established through a provision for loan losses charged to expense. The allowance is maintained at a level which, in Management’s judgment, is adequate to absorb probable incurred credit losses inherent in the loan portfolio as of the balance sheet date. Originated loans and deposit related overdrafts are charged against the allowance for loan losses when Management believes that the collectability of the principal is unlikely or, with respect to consumer installment loans, according to an established delinquency schedule. The allowance is an amount that Management believes will be adequate to absorb probable losses inherent in existing loans and leases, based on evaluations of the collectability, impairment and prior loss experience of loans and leases. The evaluations take into consideration such factors as changes in the nature and size of the portfolio, overall portfolio quality, loan concentrations, specific problem loans, and current economic conditions that may affect the borrower’s ability to pay. The Company defines an originated loan as impaired when it is probable the Company will be unable to collect all amounts due according to the contractual terms of the loan agreement. Impaired originated loans are measured based on the present value of expected future cash flows discounted at the loan’s original effective interest rate. As a practical expedient, impairment may be measured based on the loan’s observable market price or the fair value of the collateral if the loan is collateral dependent. When the measure of the impaired loan is less than the recorded investment in the loan, the impairment is recorded through a valuation allowance.
	In situations related to originated loans where, for economic or legal reasons related to a borrower’s financial difficulties, the Company grants a concession for other than an insignificant period of time to the borrower that the Company would not otherwise consider, the related loan is classified as a troubled debt restructuring (TDR). The Company strives to identify borrowers in financial difficulty early and work with them to modify to more affordable terms before their loan reaches nonaccrual status. These modified terms may include rate reductions, principal forgiveness, payment forbearance and other actions intended to minimize the economic loss and to avoid foreclosure or repossession of the collateral. In cases where the Company grants the borrower new terms that result in the loan being classified as a TDR, the Company measures any impairment on the restructuring as noted above for impaired loans. TDR loans are classified as impaired until they are fully paid off or charged off. Loans that are in nonaccrual status at the time they become TDR loans, remain in nonaccrual status until the borrower demonstrates a sustained period of performance which the Company generally believes to be six consecutive months of payments, or equivalent. Otherwise, TDR loans are subject to the same nonaccrual and charge-off policies as noted above with respect to their restructured principal balance.
	Credit risk is inherent in the business of lending. As a result, the Company maintains an allowance for loan losses to absorb losses inherent in the Company’s originated loan portfolio. This is maintained through periodic charges to earnings. These charges are included in the Consolidated Statements of Income as provision for loan losses. All specifically identifiable and quantifiable losses are immediately charged off against the allowance. However, for a variety of reasons, not all losses are immediately known to the Company and, of those that are known, the full extent of the loss may not be quantifiable at that point in time. The balance of the Company’s allowance for originated loan losses is meant to be an estimate of these unknown but probable losses inherent in the portfolio.
	The Company formally assesses the adequacy of the allowance for originated loan losses on a quarterly basis. Determination of the adequacy is based on ongoing assessments of the probable risk in the outstanding originated loan portfolio, and to a lesser extent the Company’s originated loan commitments. These assessments include the periodic re-grading of credits based on changes in their individual credit characteristics including delinquency, seasoning, recent financial performance of the borrower, economic factors, changes in the interest rate environment, growth of the portfolio as a whole or by segment, and other factors as warranted. Loans are initially graded when originated. They are re-graded as they are renewed, when there is a new loan to the same borrower, when identified facts demonstrate heightened risk of nonpayment, or if they become delinquent. Re-grading of larger problem loans occurs at least quarterly. Confirmation of the quality of the grading process is obtained by independent credit reviews conducted by consultants specifically hired for this purpose and by various bank regulatory agencies.
	The Company’s method for assessing the appropriateness of the allowance for originated loan losses includes specific allowances for impaired originated loans and leases, formula allowance factors for pools of credits, and allowances for changing environmental factors (e.g., interest rates, growth, economic conditions, etc.). Allowance factors for loan pools were based on historical loss experience by product type and prior risk rating.
	During the three months ended March 31, 2012, management changed some of the assumptions utilized in the Allowance for Loan Losses estimate calculation. These changes were intended to more accurately reflect the current risk in the loan portfolio and to better estimate the losses inherent but not yet quantifiable. These changes included the conversion to a historical loss migration analysis intended to better determine the appropriate formula reserve ratio by loan category and risk rating, the addition of an environmental factor related to the delinquency rate of loans not classified as impaired by loan category, the elimination of an unspecified reserve allocation previously intended to account for imprecision inherent in the overall calculation, and the reclassification of risk rating of certain consumer loans based on current credit score in an attempt to better identify the risk in the portfolio. The financial effect of these changes resulted in a net reduction in the calculated Allowance for Loan Losses of $1,388,000 during the three months ended March 31, 2012. Allowances for impaired loans are based on analysis of individual credits. Allowances for changing environmental factors are Management’s best estimate of the probable impact these changes have had on the originated loan portfolio as a whole. The allowance for originated loans is included in the allowance for loan losses.
	During the three months ended March 31, 2013, the Company changed the method it uses to estimate net sale proceeds from real estate collateral sales when calculating the allowance for loan losses associated with impaired real estate collateral dependent loans. Previously, the Company used the greater of fifteen percent or actual estimated selling costs. Currently, the Company uses the actual estimated selling costs, and an adjustment to appraised value based on the age of the appraisal. These changes are intended to more accurately reflect the estimated net sale proceeds from the sale of impaired collateral dependent real estate loans. This change in methodology resulted in the allowance for loan losses as of March 31, 2013 being $494,000 more than it would have been without this change in methodology.
	During the three months ended June 30, 2013, the Company modified its loss migration analysis methodology used to determine the formula allowance factors. When the Company originally established its loss migration analysis methodology during the quarter ended March 31, 2012, it reviewed the loss experience of each quarter over the previous three years in order to calculate an annualized loss rate by loan category and risk rating. The use of three years of loss experience data was originally used because that was the extent of the detailed loss data, by loan category and risk rating that was available at the time. This three year historical look-back period was used until the quarter ended June 30, 2013. Starting with the quarter ended June 30, 2013, the Company will review all available detailed loss experience data, and not limit it to the most recent three years of historical loss data. This change is intended to more accurately reflect the risk inherent in the loan portfolio by considering historical loss data for all years as the data for new periods becomes available. This change in methodology resulted in the allowance for loan losses as of June 30, 2013 being $1,314,000 more than it would have been without this change in methodology.
	During the three months ended September 30, 2013, the Company modified its methodology used to determine the allowance for changing environmental factors. Previously, the Company compared the current value of each environmental factor to a fixed baseline value. The deviation of the current value from the baseline value was then multiplied by a conversion factor to determine the required allowance related to each environmental factor. As of September 30, 2013, the Company replaced the fixed baseline values with average baseline values derived from historical averages, and adjusted the conversion factors. This change is intended to more accurately reflect the risk inherent in the portfolio by recognizing that baseline, or normal, levels for environmental factors may change over time. This change in methodology resulted in the allowance for loan losses as of September 30, 2013 being $1,665,000 more than it would have been without this change in methodology.
	Loans purchased or acquired in a business combination are referred to as acquired loans. Acquired loans are valued as of the acquisition date in accordance with Financial Accounting Standards Board Accounting Standards Codification (“FASB ASC”) Topic 805, Business Combinations. Loans acquired with evidence of credit deterioration since origination for which it is probable that all contractually required payments will not be collected are referred to as purchased credit impaired (PCI) loans. PCI loans are accounted for under FASB ASC Topic 310-30, Loans and Debt Securities Acquired with Deteriorated Credit Quality. Under FASB ASC Topic 805 and FASB ASC Topic 310-30, PCI loans are recorded at fair value at acquisition date, factoring in credit losses expected to be incurred over the life of the loan. Accordingly, an allowance for loan losses is not carried over or recorded as of the acquisition date. Fair value is defined as the present value of the future estimated principal and interest payments of the loan, with the discount rate used in the present value calculation representing the estimated effective yield of the loan. Default rates, loss severity, and prepayment speed assumptions are periodically reassessed and our estimate of future payments is adjusted accordingly. The difference between contractual future payments and estimated future payments is referred to as the nonaccretable difference. The difference between estimated future payments and the present value of the estimated future payments is referred to as the accretable yield. The accretable yield represents the amount that is expected to be recorded as interest income over the remaining life of the loan. If after acquisition, the Company determines that the estimated future cash flows of a PCI loan are expected to be more than originally estimated, an increase in the discount rate (effective yield) would be made such that the newly increased accretable yield would be recognized, on a level yield basis, over the remaining estimated life of the loan. If, after acquisition, the Company determines that the estimated future cash flows of a PCI loan are expected to be less than previously estimated, the discount rate would first be reduced until the present value of the reduced cash flow estimate equals the previous present value however, the discount rate may not be lowered below its original level at acquisition. If the discount rate has been lowered to its original level and the present value has not been sufficiently lowered, an allowance for loan loss would be established through a provision for loan losses charged to expense to decrease the present value to the required level. If the estimated cash flows improve after an allowance has been established for a loan, the allowance may be partially or fully reversed depending on the improvement in the estimated cash flows. Only after the allowance has been fully reversed may the discount rate be increased. PCI loans are put on nonaccrual status when cash flows cannot be reasonably estimated. PCI loans on nonaccrual status are accounted for using the cost recovery method or cash basis method of income recognition. PCI loans are charged off when evidence suggests cash flows are not recoverable. Foreclosed assets from PCI loans are recorded in foreclosed assets at fair value with the fair value at time of foreclosure representing cash flow from the loan. ASC 310-30 allows PCI loans with similar risk characteristics and acquisition time frame to be “pooled” and have their cash flows aggregated as if they were one loan. The Company elected to use the “pooled” method of ASC 310-30 for PCI – other loans in the acquisition of certain assets and liabilities of Granite Community Bank (“Granite”) and Citizens Bank of Northern California (“Citizens”).
	Acquired loans that are not PCI loans are referred to as purchased not credit impaired (PNCI) loans. PNCI loans are accounted for under FASB ASC Topic 310-20, Receivables – Nonrefundable Fees and Other Costs, in which interest income is accrued on a level-yield basis for performing loans. For income recognition purposes, this method assumes that all contractual cash flows will be collected, and no allowance for loan losses is established at the time of acquistion. Post-acquisition date, an allowance for loan losses may need to be established for acquired loans through a provision charged to earnings for credit losses incurred subsequent to acquisition. Under ASC 310-20, the loss would be measured based on the probable shortfall in relation to the contractual note requirements, consistent with our allowance for loan loss policy for similar loans.
	When referring to PNCI and PCI loans we will use the terms “nonaccretable difference”, “accretable yield”, or “purchase discount”. Nonaccretable difference is the difference between undiscounted contractual cash flows due and undiscounted cash flows we expect to collect, or put another way, it is the undiscounted contractual cash flows we do not expect to collect. Accretable yield is the difference between undiscounted cash flows we expect to collect and the value at which we have recorded the loan on our financial statements. On the date of acquisition, all purchased loans are recorded on our consolidated financial statements at estimated fair value. Purchase discount is the difference between the estimated fair value of loans on the date of acquisition and the principal amount owed by the borrower, net of charge offs, on the date of acquisition. We may also refer to “discounts to principal balance of loans owed, net of charge-offs”. Discounts to principal balance of loans owed, net of charge-offs is the difference between principal balance of loans owed, net of charge-offs, and loans as recorded on our financial statements. Discounts to principal balance of loans owed, net of charge-offs arise from purchase discounts, and equal the purchase discount on the acquisition date.
	Loans are also categorized as “covered” or “noncovered”. Covered loans refer to loans covered by a Federal Deposit Insurance Corporation (“FDIC”) loss sharing agreement. Noncovered loans refer to loans not covered by a FDIC loss sharing agreement.
Foreclosed Assets	'
	Foreclosed Assets
	Foreclosed assets include assets acquired through, or in lieu of, loan foreclosure. Foreclosed assets are held for sale and are initially recorded at fair value less estimated costs to sell at the date of foreclosure, establishing a new cost basis. Subsequent to foreclosure, management periodically performs valuations and the assets are carried at the lower of carrying amount or fair value less cost to sell. Revenue and expenses from operations and changes in the valuation allowance are included in other noninterest expense. Gain or loss on sale of foreclosed assets is included in noninterest income. Foreclosed assets that are not subject to a FDIC loss-share agreement are referred to as noncovered foreclosed assets.
	Foreclosed assets acquired through FDIC-assisted acquisitions that are subject to a FDIC loss-share agreement, and all assets acquired via foreclosure of covered loans are referred to as covered foreclosed assets. Covered foreclosed assets are reported exclusive of expected reimbursement cash flows from the FDIC. Foreclosed covered loan collateral is transferred into covered foreclosed assets at the loan’s carrying value, inclusive of the acquisition date fair value discount.
	Covered foreclosed assets are initially recorded at estimated fair value less estimated costs to sell on the acquisition date based on similar market comparable valuations less estimated selling costs. Any subsequent valuation adjustments due to declines in fair value will be charged to noninterest expense, and will be mostly offset by noninterest income representing the corresponding increase to the FDIC indemnification asset for the offsetting loss reimbursement amount. Any recoveries of previous valuation adjustments will be credited to noninterest expense with a corresponding charge to noninterest income for the portion of the recovery that is due to the FDIC.
Premises and Equipment	'
	Premises and Equipment
	Land is carried at cost. Land improvements, buildings and equipment, including those acquired under capital lease, are stated at cost less accumulated depreciation and amortization. Depreciation and amortization expenses are computed using the straight-line method over the estimated useful lives of the related assets or lease terms. Asset lives range from 3-10 years for furniture and equipment and 15-40 years for land improvements and buildings.
Goodwill and Other Intangible Assets	'
	Goodwill and Other Intangible Assets
	Goodwill represents the excess of costs over fair value of net assets of businesses acquired. Goodwill and other intangible assets acquired in a purchase business combination and determined to have an indefinite useful life are not amortized, but instead tested for impairment at least annually. Intangible assets with estimable useful lives are amortized over their respective estimated useful lives to their estimated residual values, and reviewed for impairment.
	The Company has an identifiable intangible asset consisting of core deposit intangibles (CDI). CDI are amortized over their respective estimated useful lives, and reviewed for impairment.
Impairment of Long-Lived Assets and Goodwill	'
	Impairment of Long-Lived Assets and Goodwill
	Long-lived assets, such as premises and equipment, and purchased intangibles subject to amortization, are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable. Recoverability of assets to be held and used is measured by a comparison of the carrying amount of an asset to estimated undiscounted future cash flows expected to be generated by the asset. If the carrying amount of an asset exceeds its estimated future cash flows, an impairment charge is recognized by the amount by which the carrying amount of the asset exceeds the fair value of the asset. Assets to be disposed of would be separately presented in the balance sheet and reported at the lower of the carrying amount or fair value less costs to sell, and are no longer depreciated. The assets and liabilities of a disposed group classified as held for sale would be presented separately in the appropriate asset and liability sections of the consolidated balance sheet.
	As of December 31 of each year, goodwill is tested for impairment, and is tested for impairment more frequently if events and circumstances indicate that the asset might be impaired. An impairment loss is recognized to the extent that the carrying amount exceeds the asset’s fair value. This determination is made at the reporting unit level. The Company may choose to first assess qualitative factors to determine whether the existence of events or circumstances leads to a determination that it is more likely than not that the fair value of a reporting unit is less than its carrying amount. If, after assessing the totality of events or circumstances, the Company determines it is not more likely than not that the fair value of a reporting unit is less than its carrying amount, then goodwill is deemed not to be impaired. However, if the Company concludes otherwise, or if the Company elected not to first assess qualitative factors, then the Company performs the first step of a two-step impairment test by calculating the fair value of the reporting unit and comparing the fair value with the carrying amount of the reporting unit. Second, if the carrying amount of the reporting unit exceeds its fair value, an impairment loss is recognized for any excess of the carrying amount of the reporting unit’s goodwill over the implied fair value of that goodwill. The implied fair value of goodwill is determined by allocating the fair value of the reporting unit in a manner similar to a purchase price allocation. The residual fair value after this allocation is the implied fair value of the reporting unit goodwill. Currently, and historically, the Company is comprised of only one reporting unit that operates within the business segment it has identified as “community banking”. Goodwill was not impaired as of December 31, 2012 because the fair value of the reporting unit exceeded its carrying value.
Mortgage Servicing Rights	'
	Mortgage Servicing Rights
	Mortgage servicing rights (MSR) represent the Company’s right to a future stream of cash flows based upon the contractual servicing fee associated with servicing mortgage loans. Our MSR arise from residential mortgage loans that we originate and sell, but retain the right to service the loans. The net gain from the retention of the servicing right is included in gain on sale of loans in noninterest income when the loan is sold. Fair value is based on market prices for comparable mortgage servicing contracts, when available, or alternatively, is based on a valuation model that calculates the present value of estimated future net servicing income. The valuation model incorporates assumptions that market participants would use in estimating future net servicing income, such as the cost to service, the discount rate, the custodial earnings rate, an inflation rate, ancillary income, prepayment speeds and default rates and losses. Servicing fees are recorded in noninterest income when earned.
	We account for MSR at fair value. The determination of fair value of our MSR requires management judgment because they are not actively traded. The determination of fair value for MSR requires valuation processes which combine the use of discounted cash flow models and extensive analysis of current market data to arrive at an estimate of fair value. The cash flow and prepayment assumptions used in our discounted cash flow model are based on empirical data drawn from the historical performance of our MSR, which we believe are consistent with assumptions used by market participants valuing similar MSR, and from data obtained on the performance of similar MSR. The key assumptions used in the valuation of MSR include mortgage prepayment speeds and the discount rate. These variables can, and generally will, change from quarter to quarter as market conditions and projected interest rates change. The key risks inherent with MSR are prepayment speed and changes in interest rates. The Company uses an independent third party to determine fair value of MSR.
Indemnification Asset	'
	Indemnification Asset
	The Company accounts for amounts receivable under loss-share agreements with the FDIC as indemnification assets in accordance with FASB ASC Topic 805, Business Combinations. FDIC indemnification assets are initially recorded at fair value, based on the discounted value of expected future cash flows under the loss-share agreements. The difference between the fair value and the undiscounted cash flows the Company expects to collect from the FDIC will be accreted into noninterest income over the life of the FDIC indemnification asset. FDIC indemnification assets are reviewed quarterly and adjusted for any changes in expected cash flows based on recent performance and expectations for future performance of the covered portfolios. These adjustments are measured on the same basis as the related covered loans and covered other real estate owned. Any increases in cash flow of the covered assets over those expected will reduce the FDIC indemnification asset and any decreases in cash flow of the covered assets under those expected will increase the FDIC indemnification asset. Increases and decreases to the FDIC indemnification asset are recorded as adjustments to noninterest income.
Reserve for Unfunded Commitments	'
	Reserve for Unfunded Commitments
	The reserve for unfunded commitments is established through a provision for losses – unfunded commitments charged to noninterest expense. The reserve for unfunded commitments is an amount that Management believes will be adequate to absorb probable losses inherent in existing commitments, including unused portions of revolving lines of credits and other loans, standby letters of credits, and unused deposit account overdraft privilege. The reserve for unfunded commitments is based on evaluations of the collectability, and prior loss experience of unfunded commitments. The evaluations take into consideration such factors as changes in the nature and size of the loan portfolio, overall loan portfolio quality, loan concentrations, specific problem loans and related unfunded commitments, and current economic conditions that may affect the borrower’s or depositor’s ability to pay.
	During the three months ended June 30, 2013, the Company modified the methodology employed to estimate potential losses on unfunded commitments. Similar to the Allowance for Loan and Lease Losses, the Company performs a migration analysis of historical loss experience. Prior to this quarter, the loss experience of each quarter over the previous three years was reviewed in order to calculate an annualized loss rate by loan category. Going forward, the Company has chosen to review all loss experience available since the conversion to a loss migration analysis. This change is intended to more accurately reflect the risk inherent in the unfunded commitments and appropriately consider all losses incurred in prior years. This change in methodology resulted in the reserve for unfunded commitments as of June 30, 2013 being $335,000 more than it would have been without this change in methodology.
Income Taxes	'
	Income Taxes
	The Company’s accounting for income taxes is based on an asset and liability approach. The Company recognizes the amount of taxes payable or refundable for the current year, and deferred tax assets and liabilities for the future tax consequences that have been recognized in its financial statements or tax returns. The measurement of tax assets and liabilities is based on the provisions of enacted tax laws. A valuation allowance, if needed, reduces deferred tax assets to the expected amount most likely to be realized. Realization of deferred tax assets is dependent upon the generation of a sufficient level of future taxable income and recoverable taxes paid in prior years. Although realization is not assured, management believes it is more likely than not that all of the deferred tax assets will be realized. Interest and/or penalties related to income taxes are reported as a component of noninterest income.
Off-Balance Sheet Credit Related Financial Instruments	'
	Off-Balance Sheet Credit Related Financial Instruments
	In the ordinary course of business, the Company has entered into commitments to extend credit, including commitments under credit card arrangements, commercial letters of credit, and standby letters of credit. Such financial instruments are recorded when they are funded.
Geographical Descriptions	'
	Geographical Descriptions
	For the purpose of describing the geographical location of the Company’s loans, the Company has defined northern California as that area of California north of, and including, Stockton; central California as that area of the state south of Stockton, to and including, Bakersfield; and southern California as that area of the state south of Bakersfield.
Reclassifications	'
	Reclassifications
	Certain amounts reported in previous consolidated financial statements have been reclassified to conform to the presentation in this report. These reclassifications did not affect previously reported net income or total shareholders’ equity.
Recent Accounting Pronouncements	'
	Recent Accounting Pronouncements
	FASB issued Accounting Standards Update (“ASU”) No. 2012-06, Business Combinations (Topic 805): Subsequent Accounting for an Indemnification Asset Recognized at the Acquisition Date as a Result of a Government-Assisted Acquisition of a Financial Institution. ASU 2012-06 requires that when a reporting entity recognizes an indemnification asset (in accordance with Subtopic 805-20) as a result of a government-assisted acquisition of a financial institution and subsequently a change in the cash flows expected to be collected on the indemnification asset occurs (as a result of a change in cash flows expected to be collected on the assets subject to indemnification), the reporting entity should subsequently account for the change in the measurement of the indemnification asset on the same basis as the change in the assets subject to indemnification. Any amortization of changes in value should be limited to the contractual term of the indemnification agreement (that is, the lesser of the term of the indemnification agreement and the remaining life of the indemnified assets). The Company adopted this Standard on January 1, 2013, and the adoption did not have a significant impact on the Company’s consolidated financial statements.
	FASB issued ASU No. 2013-02, Comprehensive Income (Topic 220): Reporting of Amounts Reclassified Out of Accumulated Other Comprehensive Income. ASU 2013-02 amends recent guidance related to the reporting of comprehensive income to enhance the reporting of reclassifications out of accumulated other comprehensive income. The Company adopted this Standard on January 1, 2013, and the adoption did not have a significant impact on the Company’s consolidated financial statements.

Investment_Securities_Tables

Investment Securities (Tables)	9 Months Ended
	Sep. 30, 2013
Investments Debt And Equity Securities [Abstract]	'
Amortized Cost and Estimated Fair Values of Investments in Debt and Equity Securities	'
	The amortized cost and estimated fair values of investments in debt and equity securities are summarized in the following tables:
		September 30, 2013
				Gross			Gross			Estimated
		Amortized		Unrealized			Unrealized			Fair
		Cost		Gains			Losses			Value
		(in thousands)
	Securities Available for Sale
	Obligations of U.S. government corporations and agencies	$	100,629	$	4,970		$	(198	)	$	105,401
	Obligations of states and political subdivisions		7,777		128			—			7,905
	Corporate debt securities		1,873		36			—			1,909
	Total securities available for sale	$	110,279	$	5,134		$	(198	)	$	115,215
	Securities Held to Maturity
	Obligations of U.S. government corporations and agencies	$	180,612	$	1,299		$	(2,905	)	$	179,006
	Obligations of states and political subdivisions		12,650		—			(1,415	)		11,235
	Total securities available for sale	$	193,262	$	1,299		$	(4,320	)	$	190,241
		31-Dec-12
				Gross			Gross			Estimated
		Amortized		Unrealized			Unrealized			Fair
		Cost		Gains			Losses			Value
		(in thousands)
	Securities Available for Sale
	Obligations of U.S. government corporations and agencies	$	143,633	$	8,068			—		$	151,701
	Obligations of states and political subdivisions		9,098		323			—			9,421
	Corporate debt securities		1,862		43			—			1,905
	Total securities available for sale	$	154,593	$	8,434			—		$	163,027
Amortized Cost and Estimated Fair Value of Debt Securities by Contractual Maturity	'
	For purposes of the following table, the entire outstanding balance of these mortgage-backed securities issued by U.S. government corporations and agencies is categorized based on final maturity date.
	Investment Securities	Available for Sale					Held to Maturity
	(In thousands)	Amortized		Estimated			Amortized			Estimated
		Cost		Fair Value			Cost			Fair Value
	Due in one year	$	2,554	$	2,594			—			—
	Due after one year through five years		4,514		4,699			—			—
	Due after five years through ten years		34,963		36,190			—			—
	Due after ten years		68,248		71,732		$	193,262		$	190,241
	Totals	$	110,279	$	115,215		$	193,262		$	190,241
Gross Unrealized Losses on Investment	'
	Gross unrealized losses on investment securities and the fair value of the related securities, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position, were as follows:
		Less than 12 months					12 months or more					Total
		Fair		Unrealized			Fair			Unrealized		Fair		Unrealized
	September 30, 2013:	Value		Loss			Value			Loss		Value		Loss
		(In thousands)
	Investment Securities Available for Sale:
	Obligations of U.S. government corporations and agencies	$	10,962	$	(198	)		—			—	$	10,962	$	(198	)
	Obligations of states and political subdivisions		—		—			—			—		—		—
	Corporate debt securities		—		—			—			—		—		—
	Total Investment Securities Available for Sale	$	10,962	$	(198	)		—			—	$	10,962	$	(198	)
	Investment Securities Held to Maturity:
	Obligations of U.S. government corporations and agencies	$	69,193	$	(2,905	)		—			—	$	69,193	$	(2,905	)
	Obligations of states and political subdivisions		11,235		(1,415	)		—			—		11,235		(1,415	)
	Total Investment Securities Held to Maturity	$	80,428	$	(4,320	)		—			—	$	80,428	$	(4,320	)

Loans_Tables

Loans (Tables)	9 Months Ended
	Sep. 30, 2013
Receivables [Abstract]	'
Summary of Loan Balances	'
	A summary of loan balances follows (in thousands):
		September 30, 2013
								PCI -			PCI -
		Originated			PNCI			Cash basis			Other			Total
	Mortgage loans on real estate:
	Residential 1-4 family	$	128,974		$	61,808			—		$	6,347		$	197,129
	Commercial		801,570			62,104			—			30,672			894,346
	Total mortgage loan on real estate		930,544			123,912			—			37,019			1,091,475
	Consumer:
	Home equity lines of credit		321,512			14,367		$	6,452			4,017			346,348
	Home equity loans		12,845			281			49			555			13,730
	Auto Indirect		1,351			—			—			—			1,351
	Other		26,106			2,101			—			75			28,282
	Total consumer loans		361,814			16,749			6,501			4,647			389,711
	Commercial		126,034			775			25			6,782			133,616
	Construction:
	Residential		26,369			—			—			1,232			27,601
	Commercial		14,074			—			—			574			14,648
	Total construction		40,443			—			—			1,806			42,249
	Total loans, net of deferred loan fees	$	1,458,835		$	141,436		$	6,526		$	50,254		$	1,657,051
	Total principal balance of loans owed, net of charge-offs	$	1,462,146		$	150,042		$	17,398		$	62,239		$	1,691,825
	Unamortized net deferred loan fees		(3,311	)											(3,311	)
	(Discounts) premiums, net, to principal balance of loans owed, net of charge-offs		—			(8,606	)		(10,872	)		(11,985	)		(31,463	)
	Total loans, net of unamortized deferred loan fees	$	1,458,835		$	141,436		$	6,526		$	50,254		$	1,657,051
	Noncovered loans	$	1,458,835		$	141,436		$	6,526		$	19,685		$	1,626,482
	Covered loans		—			—			—			30,569			30,569
	Total loans, net of unamortized deferred loan fees	$	1,458,835		$	141,436		$	6,526		$	50,254		$	1,657,051
	Allowance for loan losses	$	(32,307	)	$	(2,800	)	$	(899	)	$	(3,334	)	$	(39,340	)
	A summary of loan balances follows (in thousands):
		December 31, 2012
								PCI -			PCI -
		Originated			PNCI			Cash basis			Other			Total
	Mortgage loans on real estate:
	Residential 1-4 family	$	121,255		$	5,413			—		$	5,016		$	131,684
	Commercial		775,124			72,090		$	1,289			29,943			878,446
	Total mortgage loan on real estate		896,379			77,503			1,289			34,959			1,010,130
	Consumer:
	Home equity lines of credit		311,671			16,788			7,612			5,954			342,025
	Home equity loans		13,011			342			49			155			13,557
	Auto Indirect		3,816			—			—			—			3,816
	Other		24,263			2,418			—			32			26,713
	Total consumer loans		352,761			19,548			7,661			6,141			386,111
	Commercial		125,122			869			22			9,515			135,528
	Construction:
	Residential		11,877			—			—			6,582			18,459
	Commercial		11,196			—			—			3,399			14,595
	Total construction		23,073			—			—			9,981			33,054
	Total loans, net of deferred loan fees	$	1,397,335		$	97,920		$	8,972		$	60,596		$	1,564,823
	Total principal balance of loans owed, net of charge-offs	$	1,400,147		$	111,286		$	20,621		$	75,277		$	1,607,331
	Unamortized net deferred loan fees		(2,812	)		—			—			—			(2,812	)
	(Discounts) premiums, net, to principal balance of loans owed, net of charge-offs		—			(13,366	)		(11,649	)		(14,681	)		(39,696	)
	Total loans, net of unamortized deferred loan fees	$	1,397,335		$	97,920		$	8,972		$	60,596		$	1,564,823
	Noncovered loans	$	1,397,335		$	97,920		$	8,972		$	18,708		$	1,522,935
	Covered loans		—			—			—			41,888			41,888
	Total loans, net of unamortized deferred loan fees	$	1,397,335		$	97,920		$	8,972		$	60,596		$	1,564,823
	Allowance for loan losses	$	(35,769	)	$	(1,969	)	$	(1,054	)	$	(3,856	)	$	(42,648	)
Change in Accretable Yield for PCI	'
	The following is a summary of the change in accretable yield for PCI – other loans during the periods indicated (in thousands):
		Three months ended Sept. 30,						Nine months ended Sept. 30,
		2013			2012			2013			2012
	Change in accretable yield:
	Balance at beginning of period	$	19,727		$	23,732		$	22,337		$	25,145
	Accretion to interest income		(1,656	)		(2,037	)		(4,847	)		(5,921	)
	Reclassification from nonaccretable difference		1,850			2,385			2,431			4,857
	Balance at end of period	$	19,921		$	24,080		$	19,921		$	24,080

Allowance_for_Loan_Losses_Tabl

Allowance for Loan Losses (Tables)	9 Months Ended
	Sep. 30, 2013
Receivables [Abstract]	'
Summary of Activity in the Allowance for Loan Losses, and Ending Balance of Loans, Net of Unearned Fees for the Periods Indicated	'
	The following tables summarize the activity in the allowance for loan losses, and ending balance of loans, net of unearned fees for the periods indicated.
		Allowance for Loan Losses – Three months ended September 30, 2013
		RE Mortgage						Home Equity						Auto			Other						Construction
	(In thousands)	Resid.			Comm.			Lines			Loans			Indirect			Consum.			C&I			Resid.			Comm.			Total
	Beginning balance	$	3,231		$	8,764		$	18,710		$	1,109		$	114		$	567		$	4,929		$	1,288		$	887		$	39,599
	Charge-offs		(4	)		(23	)		(331	)		(30	)		(9	)		(239	)		(318	)		—			(31	)		(985	)
	Recoveries		154			295			304			3			34			199			108			2			20			1,119
	(Benefit) provision		(190	)		704			(871	)		(50	)		(58	)		7			(234	)		157			142			(393	)
	Ending balance	$	3,191		$	9,740		$	17,812		$	1,032		$	81		$	534		$	4,485		$	1,447		$	1,018		$	39,340
		Allowance for Loan Losses – As of and nine months ended September 30, 2013
		RE Mortgage						Home Equity						Auto			Other						Construction
	(In thousands)	Resid.			Comm.			Lines			Loans			Indirect			Consum.			C&I			Resid.			Comm.			Total
	Beginning balance	$	3,523		$	8,782		$	21,367		$	1,155		$	243		$	696		$	4,703		$	1,400		$	779		$	42,648
	Charge-offs		(46	)		(1,712	)		(1,843	)		(56	)		(67	)		(724	)		(1,143	)		(20	)		(92	)		(5,703	)
	Recoveries		345			965			809			29			180			601			244			63			46			3,282
	(Benefit) provision		(631	)		1,705			(2,521	)		(96	)		(275	)		(39	)		681			4			285			(887	)
	Ending balance	$	3,191		$	9,740		$	17,812		$	1,032		$	81		$	534		$	4,485		$	1,447		$	1,018		$	39,340
	Ending balance:
	Individ. evaluated for impairment	$	623		$	1,446		$	1,554		$	49		$	2		$	6		$	678		$	91		$	9		$	4,458
	Loans pooled for evaluation	$	2,235		$	7,748		$	15,259		$	983		$	79		$	521		$	2,450		$	723		$	653		$	30,649
	Loans acquired with deteriorated credit quality	$	333		$	546		$	999			—			—		$	7		$	1,358		$	633		$	356		$	4,233
		Loans, net of unearned fees – As of September 30, 2013
		RE Mortgage						Home Equity						Auto			Other						Construction
	(In thousands)	Resid.			Comm.			Lines			Loans			Indirect			Consum.			C&I			Resid.			Comm.			Total
	Ending balance:
	Total loans	$	197,129		$	894,346		$	346,348		$	13,730		$	1,351		$	28,282		$	133,616		$	27,601		$	14,648		$	1,657,051
	Individ. evaluated for impairment	$	7,013		$	69,373		$	7,664		$	551		$	66		$	94		$	3,333		$	2,872		$	252		$	91,218
	Loans pooled for evaluation	$	183,769		$	794,301		$	328,215		$	12,575		$	1,285		$	28,113		$	123,476		$	23,497		$	13,822		$	1,509,053
	Loans acquired with deteriorated credit quality	$	6,347		$	30,672		$	10,469		$	604			—		$	75		$	6,807		$	1,232		$	574		$	56,780
		Allowance for Loan Losses – As of and year ended December 31, 2012
		RE Mortgage						Home Equity						Auto			Other						Construction
	(In thousands)	Resid.			Comm.			Lines			Loans			Indirect			Consum.			C&I			Resid.			Comm.			Total
	Beginning balance	$	2,404		$	13,217		$	18,258		$	1,101		$	215		$	932		$	6,545		$	1,817		$	1,425		$	45,914
	Charge-offs		(1,558	)		(3,457	)		(8,042	)		(385	)		(83	)		(1,202	)		(1,251	)		(406	)		(100	)		(16,484	)
	Recoveries		147			1,020			398			100			215			860			643			412			—			3,795
	Provision (benefit)		2,530			(1,998	)		10,753			339			(104	)		106			(1,234	)		(423	)		(546	)		9,423
	Ending balance	$	3,523		$	8,782		$	21,367		$	1,155		$	243		$	696		$	4,703		$	1,400		$	779		$	42,648
	Ending balance:
	Individ. evaluated for impairment	$	631		$	515		$	2,264		$	81		$	5		$	47		$	840		$	11		$	111		$	4,505
	Loans pooled for evaluation	$	2,526		$	8,026		$	17,862		$	995		$	238		$	649		$	2,342		$	430		$	165		$	33,233
	Loans acquired with deteriorated credit quality	$	366		$	241		$	1,241		$	79			—			—		$	1,521		$	959		$	503		$	4,910
		Loans, net of unearned fees – As of December 31, 2012
		RE Mortgage						Home Equity						Auto			Other						Construction
	(In thousands)	Resid.			Comm.			Lines			Loans			Indirect			Consum.			C&I			Resid.			Comm.			Total
	Ending balance:
	Total loans	$	131,684		$	878,446		$	342,025		$	13,557		$	3,816		$	26,713		$	135,528		$	18,459		$	14,595		$	1,564,823
	Individ. evaluated for impairment	$	6,586		$	71,077		$	10,056		$	528		$	197		$	121		$	8,562		$	3,596		$	607		$	101,330
	Loans pooled for evaluation	$	120,082		$	776,137		$	318,403		$	12,825		$	3,619		$	26,560		$	117,429		$	8,281		$	10,589		$	1,393,925
	Loans acquired with deteriorated credit quality	$	5,016		$	31,232		$	13,566		$	204			—		$	32		$	9,537		$	6,582		$	3,399		$	69,568
		Allowance for Loan Losses – Three months ended September 30, 2012
		RE Mortgage						Home Equity						Auto			Other						Construction
	(In thousands)	Resid.			Comm.			Lines			Loans			Indirect			Consum.			C&I			Resid.			Comm.			Total
	Beginning balance	$	3,458		$	9,566		$	21,602		$	1,159		$	433		$	621		$	5,694		$	1,679		$	1,637		$	45,849
	Charge-offs		(370	)		(340	)		(1,636	)		(12	)		(12	)		(280	)		(625	)		—			(93	)		(3,368	)
	Recoveries		—			181			160			6			72			211			91			412			—			1,133
	Provision (benefit)		492			630			1,176			100			(161	)		132			(389	)		(802	)		(646	)		532
	Ending balance	$	3,580		$	10,037		$	21,302		$	1,253		$	332		$	684		$	4,771		$	1,289		$	898		$	44,146
		Allowance for Loan Losses – As of and nine months ended September 30, 2012
		RE Mortgage						Home Equity						Auto			Other						Construction
	(In thousands)	Resid.			Comm.			Lines			Loans			Indirect			Consum.			C&I			Resid.			Comm.			Total
	Beginning balance	$	2,404		$	13,217		$	18,258		$	1,101		$	215		$	932		$	6,545		$	1,817		$	1,425		$	45,914
	Charge-offs		(918	)		(2,008	)		(6,739	)		(170	)		(83	)		(928	)		(1,202	)		(362	)		(68	)		(12,478	)
	Recoveries		27			999			307			15			171			653			227			412			—			2,811
Provision		2,067			(2,171	)		9,476			307			29			27			(799	)		(578	)		(459	)		7,899
Ending balance	$	3,580		$	10,037		$	21,302		$	1,253		$	332		$	684		$	4,771		$	1,289		$	898		$	44,146
Ending balance:
Individ. evaluated for impairment	$	794		$	1,234		$	2,140		$	174		$	9		$	45		$	773		$	40		$	550		$	5,759
Loans pooled for evaluation	$	2,415		$	8,239		$	17,899		$	999		$	324		$	640		$	2,445		$	465		$	81		$	33,507
Loans acquired with deteriorated credit quality	$	371		$	564		$	1,263		$	79			—			—		$	1,553		$	783		$	267		$	4,880
	Loans, net of unearned fees – As of September 30, 2012
	RE Mortgage						Home Equity						Auto			Other						Construction
(In thousands)	Resid.			Comm.			Lines			Loans			Indirect			Consum.			C&I			Resid.			Comm.			Total
Ending balance:
Total loans	$	134,041		$	873,391		$	342,898		$	14,270		$	5,067		$	26,609		$	145,469		$	18,332		$	15,570		$	1,575,647
Individ. evaluated for impairment	$	9,285		$	68,887		$	9,946		$	683		$	260		$	136		$	8,696		$	4,126		$	6,955		$	108,974
Loans pooled for evaluation	$	118,702		$	771,971		$	318,987		$	13,383		$	4,807		$	26,450		$	124,487		$	6,448		$	5,089		$	1,390,324
Loans acquired with deteriorated credit quality	$	6,054		$	32,533		$	13,965		$	204			—		$	23		$	12,286		$	7,758		$	3,526		$	76,349
Presentation of Credit Quality Indicators	'
	The following tables present ending loan balances by loan category and risk grade as of the dates indicated:
		Credit Quality Indicators – As of September 30, 2013
		RE Mortgage						Home Equity						Auto			Other						Construction
	(In thousands)	Resid.			Comm.			Lines			Loans			Indirect			Consumer			C&I			Resid.			Comm.			Total
	Originated loans:
	Pass	$	120,824		$	731,319		$	308,997		$	11,827		$	1,051		$	25,462		$	121,901		$	22,205		$	13,268		$	1,356,854
	Special mention		968			20,660			2,731			217			157			529			740			98			520			26,620
	Substandard		7,182			49,591			9,784			801			143			115			3,393			4,066			286			75,361
	Total Originated loans	$	128,974		$	801,570		$	321,512		$	12,845		$	1,351		$	26,106		$	126,034		$	26,369		$	14,074		$	1,458,835
	PNCI loans:
	Pass	$	61,123		$	55,446		$	13,466		$	281			—		$	2,039		$	450			—			—		$	132,805
	Special mention		—			3,060			177			—			—			24			325			—			—			3,586
	Substandard		685			3,598			724			—			—			38			—			—			—			5,045
	Total PNCI loans	$	61,808		$	62,104		$	14,367		$	281			—		$	2,101		$	775			—			—		$	141,436
	PCI loans	$	6,347		$	30,672		$	10,469		$	604			—		$	75		$	6,807		$	1,232		$	574		$	56,780
	Total loans	$	197,129		$	894,346		$	346,348		$	13,730		$	1,351		$	28,282		$	133,616		$	27,601		$	14,648		$	1,657,051
		Credit Quality Indicators – As of December 31, 2012
		RE Mortgage						Home Equity						Auto			Other						Construction
	(In thousands)	Resid.			Comm.			Lines			Loans			Indirect			Consumer			C&I			Resid.			Comm.			Total
	Originated loans:
	Pass	$	108,946		$	686,593		$	291,701		$	11,892		$	2,949		$	23,154		$	113,595		$	7,744		$	10,221		$	1,256,795
	Special mention		3,122			21,184			6,955			555			531			958			3,224			285			356			37,170
	Substandard		9,187			67,347			13,015			564			336			151			8,303			3,848			619			103,370
	Total Originated loans	$	121,255		$	775,124		$	311,671		$	13,011		$	3,816		$	24,263		$	125,122		$	11,877		$	11,196		$	1,397,335
	PNCI loans:
	Pass	$	4,968		$	64,917		$	15,915		$	342			—		$	2,240		$	848			—			—		$	89,230
	Special mention		—			5,249			193			—			—			104			21			—			—			5,567
	Substandard		436			1,924			680			—			—			74			—			—			—			3,114
	Loss		9			—			—			—			—			—			—			—			—			9
	Total PNCI loans	$	5,413		$	72,090		$	16,788		$	342			—		$	2,418		$	869			—			—		$	97,920
	PCI loans	$	5,016		$	31,232		$	13,566		$	204			—		$	32		$	9,537		$	6,582		$	3,399		$	69,568
	Total loans	$	131,684		$	878,446		$	342,025		$	13,557		$	3,816		$	26,713		$	135,528		$	18,459		$	14,595		$	1,564,823
Analysis of Past Due and Nonaccrual Loans	'
	The following table shows the ending balance of current, past due, and nonaccrual originated loans by loan category as of the date indicated:
		Analysis of Past Due and Nonaccrual Originated Loans – As of September 30, 2013
	(In thousands)	RE Mortgage						Home Equity						Auto			Other						Construction
	Originated loan balance:	Resid.			Comm.			Lines			Loans			Indirect			Consumer			C&I			Resid.			Comm.			Total
	Past due:
	30-59 Days	$	184		$	5,323		$	3,258		$	67		$	38		$	28		$	372		$	107		$	49		$	9,426
	60-89 Days		1,023			2,887			987			90			—			2			939			232			198			6,358
	> 90 Days		176			7,234			2,007			254			40			10			125			19			68			9,933
	Total past due		1,383			15,444			6,252			411			78			40			1,436			358			315			25,717
	Current		127,591			786,126			315,260			12,434			1,273			26,066			124,598			26,011			13,759			1,433,118
	Total Originated loans	$	128,974		$	801,570		$	321,512		$	12,845		$	1,351		$	26,106		$	126,034		$	26,369		$	14,074		$	1,458,835
	> 90 Days and still accruing		—			—			—			—			—			—			—			—			—			—
	Nonaccrual loans	$	4,353		$	38,241		$	6,098		$	490		$	59		$	28		$	1,152		$	2,588		$	252		$	53,261
	The following table shows the ending balance of current, past due, and nonaccrual PNCI loans by loan category as of the date indicated:
		Analysis of Past Due and Nonaccrual PNCI Loans – As of September 30, 2013
	(In thousands)	RE Mortgage						Home Equity						Auto			Other						Construction
	PNCI loan balance:	Resid.			Comm.			Lines			Loans			Indirect			Consumer			C&I			Resid.			Comm.			Total
	Past due:
	30-59 Days		—		$	514			—			—			—			—			—			—			—		$	514
	60-89 Days		—			1,883		$	38			—			—			—			—			—			—			1,921
	> 90 Days		—			10			—			—			—			—			—			—			—			10
	Total past due		—			2,407			38			—			—			—			—			—			—			2,445
	Current	$	61,808			59,697			14,329		$	281			—		$	2,101		$	775			—			—			138,991
	Total PNCI loans	$	61,808		$	62,104		$	14,367		$	281			—		$	2,101		$	775			—			—		$	141,436
	> 90 Days and still accruing		—			—			—			—			—			—			—			—			—			—
	Nonaccrual loans	$	265		$	800		$	494			—			—		$	38			—			—			—		$	1,597
	The following table shows the ending balance of current, past due, and nonaccrual originated loans by loan category as of the date indicated:
		Analysis of Past Due and Nonaccrual Originated Loans – As of December 31, 2012
	(In thousands)	RE Mortgage						Home Equity						Auto			Other						Construction
	Originated loan balance:	Resid.			Comm.			Lines			Loans			Indirect			Consumer			C&I			Resid.			Comm.			Total
	Past due:
	30-59 Days	$	1,702		$	2,695		$	3,371		$	67		$	77		$	67		$	1,848		$	309			—		$	10,136
	60-89 Days		278			1,578			819			33			40			40			138			—			—			2,926
	> 90 Days		674			13,829			3,395			217			79			14			4,782			42		$	94			23,126
	Total past due		2,654			18,102			7,585			317			196			121			6,768			351			94			36,188
	Current		118,601			757,022			304,086			12,694			3,620			24,142			118,354			11,526			11,102			1,361,147
	Total Originated loans	$	121,255		$	775,124		$	311,671		$	13,011		$	3,816		$	24,263		$	125,122		$	11,877		$	11,196		$	1,397,335
	> 90 Days and still accruing		—			—			—			—			—			—			—			—			—			—
	Nonaccrual loans	$	4,781		$	37,220		$	8,486		$	465		$	174		$	49		$	6,750		$	3,312		$	532		$	61,769
	The following table shows the ending balance of current, past due, and nonaccrual PNCI loans by loan category as of the date indicated:
		Analysis of Past Due and Nonaccrual PNCI Loans – As of December 31, 2012
	(In thousands)	RE Mortgage						Home Equity						Auto			Other						Construction
	PNCI loan balance:	Resid.			Comm.			Lines			Loans			Indirect			Consumer			C&I			Resid.			Comm.			Total
	Past due:
	30-59 Days	$	1,024		$	500		$	124			—			—		$	31			—			—			—		$	1,679
	60-89 Days		—			—			63			—			—			—			—			—			—			63
	> 90 Days		43			148			157			—			—			—			—			—			—			348
	Total past due		1,067			648			344			—			—			31			—			—			—			2,090
	Current		4,346			71,442			16,444		$	342			—			2,387		$	869			—			—			95,830
	Total PNCI loans	$	5,413		$	72,090		$	16,788		$	342			—		$	2,418		$	869			—			—		$	97,920
	> 90 Days and still accruing		—			—			—			—			—			—			—			—			—			—
	Nonaccrual loans	$	113		$	1,218		$	403			—			—		$	42			—			—			—		$	1,776
Impaired Loans	'
	The following tables show the recorded investment (financial statement balance), unpaid principal balance, average recorded investment, and interest income recognized for impaired Originated and PNCI loans, segregated by those with no related allowance recorded and those with an allowance recorded for the periods indicated.
		Impaired Originated Loans – As of September 30, 2013
		RE Mortgage						Home Equity						Auto			Other						Construction
	(In thousands)	Resid.			Comm.			Lines			Loans			Indirect			Consumer			C&I			Resid.			Comm.			Total
	With no related allowance recorded:
	Recorded investment	$	4,195		$	61,418		$	3,938		$	442		$	61		$	19		$	1,161		$	2,588		$	68		$	73,890
	Unpaid principal	$	6,320		$	67,314		$	7,445		$	1,131		$	135		$	32		$	1,182		$	7,345		$	68		$	90,972
	Average recorded investment	$	3,911		$	61,375		$	4,543		$	415		$	120		$	19		$	2,802		$	1,837		$	137		$	75,159
	Interest income recognized	$	246		$	2,644		$	268		$	21		$	10		$	2		$	61		$	81		$	1		$	3,334
	With an allowance recorded:
	Recorded investment	$	2,468		$	6,990		$	3,232		$	109		$	5		$	9		$	2,158		$	284		$	184		$	15,439
	Unpaid principal	$	2,510		$	7,670		$	3,703		$	161		$	7		$	10		$	3,063		$	284		$	426		$	17,834
	Related allowance	$	480		$	1,293		$	1,350		$	49		$	2		$	3		$	678		$	91		$	9		$	3,955
	Average recorded investment	$	2,304		$	5,568		$	3,722		$	126		$	19		$	12		$	2,519		$	1,438		$	242		$	15,950
	Interest income recognized	$	93		$	388		$	109		$	8			—		$	1		$	155		$	14		$	16		$	784
	The following tables show the recorded investment (financial statement balance), unpaid principal balance, average recorded investment, and interest income recognized for impaired Originated and PNCI loans, segregated by those with no related allowance recorded and those with an allowance recorded for the periods indicated.
		Impaired PNCI Loans – As of September 30, 2013
		RE Mortgage						Home Equity						Auto			Other						Construction
	(In thousands)	Resid.			Comm.			Lines			Loans			Indirect			Consumer			C&I			Resid.			Comm.			Total
	With no related allowance recorded:
	Recorded investment		—		$	800		$	290			—			—		$	38		$	14			—			—		$	1,142
	Unpaid principal		—		$	2,893		$	342			—			—		$	46		$	14			—			—		$	3,295
	Average recorded investment		—		$	1,088		$	367			—			—		$	30		$	4			—			—		$	1,489
	Interest income recognized		—		$	154		$	19			—			—		$	4			—			—			—		$	177
	With an allowance recorded:
	Recorded investment	$	350		$	165		$	204			—			—		$	28			—			—			—		$	747
	Unpaid principal	$	366		$	165		$	214			—			—		$	28			—			—			—		$	773
	Related allowance	$	193		$	133		$	179			—			—		$	10			—			—			—		$	515
	Average recorded investment	$	276		$	292		$	121			—			—		$	40			—			—			—		$	729
	Interest income recognized	$	18		$	7		$	9			—			—		$	1			—			—			—		$	35
		Impaired Originated Loans – As of December 31, 2012
		RE Mortgage						Home Equity						Auto			Other						Construction
	(In thousands)	Resid.			Comm.			Lines			Loans			Indirect			Consumer			C&I			Resid.			Comm.			Total
	With no related allowance recorded:
	Recorded investment	$	3,520		$	66,031		$	4,241		$	361		$	163		$	19		$	4,238		$	3,554		$	284		$	82,411
	Unpaid principal	$	5,349		$	70,709		$	6,691		$	781		$	311		$	40		$	4,613		$	8,227		$	484		$	97,205
	Average recorded investment	$	6,329		$	61,299		$	4,311		$	329		$	263		$	42		$	7,500		$	3,505		$	517		$	84,095
	Interest income recognized	$	71		$	2,513		$	58		$	1		$	3			—		$	73		$	20		$	10		$	2,749
	With an allowance recorded:
	Recorded investment	$	2,867		$	3,258		$	5,412		$	167		$	34		$	30		$	4,324		$	42		$	323		$	16,457
	Unpaid principal	$	3,432		$	3,556		$	7,103		$	396		$	51		$	32		$	4,992		$	42		$	523		$	20,127
	Related allowance	$	603		$	352		$	2,237		$	81		$	5		$	12		$	840		$	11		$	111		$	4,252
	Average recorded investment	$	3,890		$	7,841		$	6,331		$	317		$	102		$	49		$	2,800		$	1,543		$	6,570		$	29,443
	Interest income recognized	$	67		$	129		$	103		$	16		$	1		$	1		$	100		$	6		$	5		$	428
	The following tables show the recorded investment (financial statement balance), unpaid principal balance, average recorded investment, and interest income recognized for impaired PNCI and Originated loans, segregated by those with no related allowance recorded and those with an allowance recorded for the periods indicated.
		Impaired PNCI Loans – As of December 31, 2012
		RE Mortgage						Home Equity						Auto			Other						Construction
	(In thousands)	Resid.			Comm.			Lines			Loans			Indirect			Consumer			C&I			Resid.			Comm.			Total
	With no related allowance recorded:
	Recorded investment		—		$	1,468		$	365			—			—			—			—			—			—		$	1,833
	Unpaid principal		—		$	3,452		$	586			—			—			—			—			—			—		$	4,038
	Average recorded investment	$	16		$	2,097		$	308		$	11			—		$	31		$	11			—			—		$	2,474
	Interest income recognized		—		$	133		$	5			—			—			—			—			—			—		$	138
	With an allowance recorded:
	Recorded investment	$	199		$	320		$	38			—			—		$	72			—			—			—		$	629
	Unpaid principal	$	225		$	331		$	41			—			—		$	76			—			—			—		$	673
	Related allowance	$	28		$	163		$	27			—			—		$	35			—			—			—		$	253
	Average recorded investment	$	213		$	121		$	148			—			—		$	43			—			—			—		$	525
	Interest income recognized	$	9		$	12		$	1			—			—		$	2			—			—			—		$	24
		Impaired Originated Loans – As of September 30, 2012
		RE Mortgage						Home Equity						Auto			Other						Construction
	(In thousands)	Resid.			Comm.			Lines			Loans			Indirect			Consumer			C&I			Resid.			Comm.			Total
	With no related allowance recorded:
Recorded investment	$	5,971		$	58,397		$	4,262		$	390		$	207		$	32		$	6,907		$	3,879		$	524		$	80,569
Unpaid principal	$	8,638		$	67,181		$	7,183		$	866		$	375		$	52		$	7,753		$	9,010		$	864		$	101,922
Average recorded Investment	$	6,857		$	60,994		$	4,331		$	314		$	289		$	47		$	8,143		$	3,434		$	554		$	84,963
Interest income Recognized	$	41		$	1,178		$	36		$	4		$	3			—		$	43		$	19		$	8		$	1,332
With an allowance recorded:
Recorded investment	$	2,895		$	7,428		$	4,981		$	293		$	53		$	31		$	1,789		$	247		$	6,431		$	24,148
Unpaid principal	$	3,401		$	8,482		$	6,712		$	555		$	74		$	33		$	1,826		$	295		$	6,544		$	27,922
Related allowance	$	610		$	1,068		$	2,009		$	174		$	9		$	8		$	773		$	40		$	550		$	5,241
Average recorded Investment	$	2,934		$	6,755		$	4,527		$	261		$	90		$	39		$	1,359		$	1,529		$	6,463		$	23,957
Interest income Recognized	$	77		$	145		$	61		$	6		$	1			—		$	72		$	3		$	287		$	652
The following tables show the recorded investment (financial statement balance), unpaid principal balance, average recorded investment, and interest income recognized for impaired PNCI loans, segregated by those with no related allowance recorded and those with an allowance recorded for the periods indicated.
	Impaired PNCI Loans – As of September 30, 2012
	RE Mortgage						Home Equity						Auto			Other						Construction
(In thousands)	Resid.			Comm.			Lines			Loans			Indirect			Consumer			C&I			Resid.			Comm.			Total
With no related allowance recorded:
Recorded investment	$	63		$	2,739		$	287			—			—			—			—			—			—		$	3,089
Unpaid principal	$	63		$	4,769		$	319			—			—			—			—			—			—		$	5,151
Average recorded Investment	$	11		$	2,095		$	302		$	15			—		$	41		$	15			—			—		$	2,479
Interest income Recognized	$	3		$	130		$	8			—			—			—			—			—			—		$	141
With an allowance recorded:
Recorded investment	$	356		$	323		$	416			—			—		$	73			—			—			—		$	1,168
Unpaid principal	$	359		$	334		$	418			—			—		$	77			—			—			—		$	1,188
Related allowance	$	184		$	165		$	132			—			—		$	37			—			—			—		$	518
Average recorded Investment	$	192		$	54		$	122			—			—		$	33			—			—			—		$	401
Interest income Recognized	$	10		$	10		$	17			—			—		$	1			—			—			—		$	38
Troubled Debt Restructurings	'
	The following table shows certain information regarding Troubled Debt Restructurings (TDRs) that occurred during the period indicated:
		TDR Information for the Three Months Ended September 30, 2013
		RE Mortgage						Home Equity						Auto			Other						Construction
	(In thousands)	Resid.			Comm.			Lines			Loans			Indirect			Consum.			C&I			Resid.			Comm.			Total
	Number		4			1			3			—			—			—			5			—			—			13
	Pre-modification out-standing principal balance	$	607		$	25		$	480			—			—			—		$	113			—			—		$	1,225
	Post-modification out-standing principal balance	$	607		$	26		$	482			—			—			—		$	114			—			—		$	1,229
	Financial impact due to troubled debt restructure taken as additional provision		—		$	4		$	27			—			—			—		$	30			—			—		$	61
	Number that defaulted during the period		—			3			2			—			—			—			—			—			—			5
	Recorded investment of TDRs that defaulted during the period		—		$	674		$	100			—			—			—			—			—			—		$	774
	Financial impact due to the default of previous troubled debt restructure taken as charge-offs or additional provisions		—			—		$	7			—			—			—			—			—			—		$	7
	The following tables show certain information regarding TDRs that occurred during the periods indicated:
		TDR Information for the Nine Months Ended September 30, 2013
		RE Mortgage						Home Equity						Auto			Other						Construction
	(In thousands)	Resid.			Comm.			Lines			Loans			Indirect			Consum.			C&I			Resid.			Comm.			Total
	Number		6			7			10			—			—			—			7			—			—			30
	Pre-modification out-standing principal balance	$	1,039		$	4,580		$	1,062			—			—			—		$	221			—			—		$	6,902
	Post-modification out-standing principal balance	$	1,043		$	4,581		$	1,069			—			—			—		$	222			—			—		$	6,915
	Financial impact due to troubled debt restructure taken as additional provision	$	151		$	26		$	220			—			—			—		$	88			—			—		$	485
	Number that defaulted during the period		2			7			2			—			—			—			3			1			—			15
	Recorded investment of TDRs that defaulted during the period	$	181		$	1,065		$	100			—			—			—		$	1,297		$	73			—		$	3,256
	Financial impact due to the default of previous troubled debt restructure taken as charge-offs or additional provisions	$	(3	)		—		$	7			—			—			—			—		$	5			—		$	9
		TDR Information for the Three Months Ended September 30, 2012
		RE Mortgage						Home Equity						Auto			Other						Construction
	(Dollars in thousands)	Resid.			Comm.			Lines			Loans			Indirect			Consum.			C&I			Resid.			Comm.			Total
	Number		1			4			2			—			—			—			2			1			—			10
	Pre-modification out-standing principal balance	$	101		$	609		$	146			—			—			—		$	249		$	86			—		$	1,191
	Post-modification out-standing principal balance	$	101		$	609		$	150			—			—			—		$	249		$	97			—		$	1,206
	Financial Impact due to troubled debt restructure taken as additional provision		—		$	154			—			—			—			—		$	158			—			—		$	312
	Number that defaulted during the period		—			1			2			—			—			—			—			—			2			5
	Recorded investment of TDRs that defaulted during the period		—		$	625		$	169			—			—			—			—			—		$	217		$	1,011
	Financial Impact due to the default of previous troubled debt restructure taken as charge-offs or additional provisions		—			—			—			—			—			—			—			—			—			—
	The following table shows certain information regarding TDRs that occurred during the period indicated:
		TDR Information for the Nine Months Ended September 30, 2012
		RE Mortgage						Home Equity						Auto			Other						Construction
	(In thousands)	Resid.			Comm.			Lines			Loans			Indirect			Consum.			C&I			Resid.			Comm.			Total
	Number		4			14			10			—			—			1			3			3			—			35
	Pre-modification out-standing principal balance	$	822		$	3,220		$	1,398			—			—		$	38		$	498		$	317			—		$	6,293
	Post-modification out-standing principal balance	$	842		$	3,182		$	1,471			—			—		$	38		$	498		$	328			—		$	6,359
	Financial impact due to troubled debt restructure taken as additional provision	$	(11	)	$	212		$	60			—			—			—		$	158			—			—		$	419
	Number that defaulted during the period		1			8			3			1			—			—			2			1			3			19
	Recorded investment of TDRs that defaulted during the period	$	112		$	4,303		$	443		$	46			—			—		$	1,124		$	97		$	256		$	6,381
	Financial impact due to the default of previous troubled debt restructure taken as charge-offs or additional provisions		—			—		$	(13	)	$	(1	)		—			—		$	50			—			—		$	36

Foreclosed_Assets_Tables

Foreclosed Assets (Tables)	9 Months Ended
	Sep. 30, 2013
Text Block [Abstract]	'
Summary of the Activity in the Balance of Foreclosed Assets	'
	A summary of the activity in the balance of foreclosed assets follows (in thousands):
		Nine months ended September 30, 2013									Nine months ended September 30, 2012
		Noncovered			Covered			Total			Noncovered			Covered			Total
	Beginning balance, net	$	5,957		$	1,541		$	7,498		$	13,268		$	3,064		$	16,332
	Additions/transfers from loans		7,542			493			8,035			5,657			633			6,290
	Dispositions/sales		(10,004	)		(769	)		10,773	)		(10,073	)		(844	)		(10,917	)
	Valuation adjustments		(539	)		(81	)		(620	)		(1,059	)		(461	)		(1,520	)
	Ending balance, net	$	2,956		$	1,184		$	4,140		$	7,793		$	2,392		$	10,185
	Ending valuation allowance	$	(587	)	$	(340	)	$	(927	)	$	(1,385	)	$	(846	)	$	(2,231	)
	Ending number of foreclosed assets		26			5			31			42			8			50
	Proceeds from sale of foreclosed assets	$	11,383		$	869		$	12,252		$	10,271		$	1,010		$	11,281
	Gain (loss) on sale of foreclosed assets	$	1,379		$	100		$	1,479		$	198		$	166		$	364

Premises_and_Equipment_Tables

Premises and Equipment (Tables)	9 Months Ended
	Sep. 30, 2013
Property Plant And Equipment [Abstract]	'
Summary of Premises and Equipment	'
	Premises and equipment were comprised of:
		September 30,			December 31,
		2013			2012
		(In thousands)
	Land & land improvements	$	5,922		$	5,929
	Buildings		30,082			23,090
	Furniture and equipment		27,590			25,877
			63,594			54,896
	Less: Accumulated depreciation		(32,393	)		(32,101	)
			31,201			22,795
	Construction in progress		45			4,190
	Total premises and equipment	$	31,246		$	26,985

Cash_Value_of_Life_Insurance_T

Cash Value of Life Insurance (Tables)	9 Months Ended
	Sep. 30, 2013
Investments All Other Investments [Abstract]	'
Summary of the Activity in the Balance of Cash Value of Life Insurance	'
	A summary of the activity in the balance of cash value of life insurance follows (in thousands):
		Nine months ended September 30,
		2013		2012
	Beginning balance	$	50,582	$	50,403
	Increase in cash value of life insurance		1,337		1,350
	Gain on life insurance death benefit		—		600
	Death benefit		—		(1,611	)
	Ending balance	$	51,919	$	50,742
	End of period death benefit	$	95,206	$	95,132
	Number of policies owned		133		136
	Insurance companies used		6		6
	Current and former employees and directors covered		36		37

Goodwill_and_Other_Intangible_1

Goodwill and Other Intangible Assets (Tables)	9 Months Ended
	Sep. 30, 2013
Goodwill And Intangible Assets Disclosure [Abstract]	'
Summary of Goodwill Intangible	'
	The following table summarizes the Company’s goodwill intangible as of the dates indicated.
		September 30,								December 31,
	(In thousands)	2013			Additions		Reductions			2012
	Goodwill	$	15,519			—		—		$	15,519
Summary of Core Deposit Intangibles	'
	The following table summarizes the Company’s core deposit intangibles as of the dates indicated.
		September 30,								December 31,
	(In thousands)	2013			Additions		Reductions			2012
	Core deposit intangibles	$	1,460			—		—		$	1,460
	Accumulated amortization		(525	)		—	$	(157	)		(368	)
	Core deposit intangibles, net	$	935			—	$	(157	)	$	1,092
Estimated Core Deposit Intangible Amortization	'
	The following table summarizes the Company’s estimated core deposit intangible amortization (in thousands):
		Estimated Core Deposit
	Years Ended	Intangible Amortization
	2013	$	209
	2014		209
	2015		209
	2016		209
	2017		209
	2018		47

Mortgage_Servicing_Rights_Tabl

Mortgage Servicing Rights (Tables)	9 Months Ended
	Sep. 30, 2013
Text Block [Abstract]	'
Fair Value of Mortgage Servicing Rights	'
	The following tables summarize the activity in, and the main assumptions we used to determine the fair value of mortgage servicing rights for the periods indicated (in thousands):
		Three months ended September 30,					Nine months ended September 30,
		2013		2012			2013			2012
	Mortgage servicing rights:
	Balance at beginning of period	$	5,571	$	4,757		$	4,552		$	4,603
	Additions		298		409			1,187			1,395
	Change in fair value		180		(681	)		310			(1,513	)
	Balance at end of period	$	6,049	$	4,485		$	6,049		$	4,485
	Servicing, late and ancillary fees received	$	428	$	389		$	1,261		$	1,140
	Balance of loans serviced at:
	Beginning of period	$	682,176	$	628,674		$	666,512		$	598,185
	End of period	$	683,910	$	642,110		$	683,910		$	642,110
	Weighted-average prepayment speed (CPR)							11	%		20.9	%
	Discount rate							10	%		10	%

Indemnification_Asset_Tables

Indemnification Asset (Tables)	9 Months Ended
	Sep. 30, 2013
Text Block [Abstract]	'
A Summary of the Activity in the Balance of Indemnification Asset	'
	A summary of the activity in the balance of indemnification asset follows (in thousands):
		Three months ended September 30,						Nine months ended September 30,
		2013			2012			2013			2012
	Beginning balance	$	1,441		$	4,046		$	1,997		$	4,405
	Effect of actual covered losses and change in estimated future covered losses		(505	)		(87	)		(783	)		241
	Reimbursable expenses (revenue), net		51			2			(42	)		12
	Payments received		(126	)		(1,476	)		(311	)		(2,173	)
	Ending balance	$	861		$	2,485		$	861		$	2,485

Other_Assets_Tables

Other Assets (Tables)	9 Months Ended
	Sep. 30, 2013
Deferred Costs Capitalized Prepaid And Other Assets Disclosure [Abstract]	'
Summary of Other Assets	'
	Other assets were comprised of (in thousands):
		September 30,		December 31,
		2013		2012
	Deferred tax asset, net	$	29,046	$	28,935
	Prepaid expense including FDIC assessment and taxes		1,787		3,455
	Software		1347		1,550
	Life insurance proceeds receivable		—		706
	Advanced compensation		1,253		1,440
	TriCo Capital Trust I & II		1,238		1,238
	Miscellaneous other assets		568		1,283
	Total other assets	$	35,239	$	38,607

Deposits_Tables

Deposits (Tables)	9 Months Ended
	Sep. 30, 2013
Banking And Thrift [Abstract]	'
Summary of the Balances of Deposits	'
	A summary of the balances of deposits follows (in thousands):
		September 30,		December 31,
		2013		2012
	Noninterest-bearing demand	$	656,266	$	684,833
	Interest-bearing demand		524,897		503,465
	Savings		811,182		762,924
	Time certificates, $100,000 and over		163,033		180,195
	Other time certificates		137,933		158,285
	Total deposits	$	2,293,311	$	2,289,702

Reserve_for_Unfunded_Commitmen1

Reserve for Unfunded Commitments (Tables)	9 Months Ended
	Sep. 30, 2013
Text Block [Abstract]	'
Summary of the Activity in Reserve for Unfunded Commitments	'
	The following tables summarize the activity in reserve for unfunded commitments for the periods indicated (in thousands):
		Three months ended September 30,						Nine months ended September 30,
		2013			2012			2013			2012
	Balance at beginning of period	$	3,210		$	2,590		$	3,615		$	2,740
	Provision for losses – unfunded commitments		(335	)		(35	)		(740	)		(185	)
	Balance at end of period	$	2,875		$	2,555		$	2,875		$	2,555

Other_Liabilities_Tables

Other Liabilities (Tables)	9 Months Ended
	Sep. 30, 2013
Other Liabilities Disclosure [Abstract]	'
Components of Other Liabilities	'
	Other liabilities were comprised of (in thousands):
		September 30,		December 31,
		2013		2012
	Deferred compensation	$	7,158	$	7,738
	Supplemental retirement		17,275		16,345
	Joint beneficiary agreements		2,951		2,736
	Accrued legal settlement		—		2,090
	Miscellaneous other liabilities		6,283		6,213
	Total other liabilities	$	33,667	$	35,122

Other_Borrowings_Tables

Other Borrowings (Tables)	9 Months Ended
	Sep. 30, 2013
Text Block [Abstract]	'
Summary of the Balances of Other Borrowings	'
	A summary of the balances of other borrowings follows:
		September 30,		December 31,
	(In thousands)	2013		2012
	Other collateralized borrowings, fixed rate, as of September 30, 2013 of 0.05% payable on October 1, 2013	$	14,626	$	9,197
	Total other borrowings	$	14,626	$	9,197

Commitments_and_Contingencies_

Commitments and Contingencies (Tables)	9 Months Ended
	Sep. 30, 2013
Commitments And Contingencies Disclosure [Abstract]	'
Future Minimum Commitments under Non-Cancelable Operating Leases with Initial or Remaining Terms of One Year or More	'
	At December 31, 2012, future minimum commitments under non-cancelable operating leases with initial or remaining terms of one year or more are as follows:
		Operating
		Leases
		(In thousands)
	2013	$	2,772
	2014		2,417
	2015		1,536
	2016		954
	2017		617
	Thereafter		1,312
	Future minimum lease payments	$	9,608
Summary of the Bank's Commitments and Contingent Liabilities	'
	The following table presents a summary of the Bank’s commitments and contingent liabilities:
	(In thousands)	September 30,		December 31,
		2013		2012
	Financial instruments whose amounts represent risk:
	Commitments to extend credit:
	Commercial loans	$	119,638	$	123,517
	Consumer loans		356,850		369,467
	Real estate mortgage loans		31,926		27,959
	Real estate construction loans		22,003		36,311
	Standby letters of credit		2,013		2,905
	Deposit account overdraft privilege		70,424		69,675

Stock_Options_and_Other_Equity1

Stock Options and Other Equity-Based Incentive Instruments (Tables)	9 Months Ended
	Sep. 30, 2013
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]	'
Stock Option Activity	'
	Stock option activity is summarized in the following table for the time period indicated:
							Weighted		Weighted
							Average		Average Fair
		Number			Option Price		Exercise		Value on
		of Shares			per Share		Price		Date of Grant
	Outstanding at December 31, 2012		1,393,935		$	12.60 to $25.91	$	17.07
	Options granted		144,500		$	16.59 to $19.46	$	19.31	$	8.91
	Options exercised		(248,765	)	$	12.60 to $20.58	$	13.03
	Options forfeited		(8,000	)	$	22.54 to $25.91	$	24.23
	Outstanding at September 30, 2013		1,281,670		$	12.63 to $25.91	$	18.06
Summary of Options Outstanding	'
	The following table shows the number, weighted-average exercise price, intrinsic value, and weighted average remaining contractual life of options exercisable, options not yet exercisable and total options outstanding as of September 30, 2013:
		Currently			Currently Not		Total
		Exercisable			Exercisable		Outstanding
	Number of options		825,570			456,100		1,281,670
	Weighted average exercise price	$	18.86		$	16.63	$	18.06
	Intrinsic value (in thousands)	$	3,395		$	2,806	$	6,201
	Weighted average remaining contractual term (yrs.)		4			8.5		5.6

Noninterest_Income_and_Expense1

Noninterest Income and Expenses (Tables)	9 Months Ended
	Sep. 30, 2013
Other Income And Expenses [Abstract]	'
Components of Other Noninterest Income	'
	The components of other noninterest income were as follows (in thousands):
		Three months ended						Nine months ended
		September 30,						September 30,
		2013			2012			2013			2012
	Service charges on deposit accounts	$	3,353		$	3,617		$	9,770		$	10,788
	ATM and interchange fees		2,132			1,877			6,240			5,722
	Other service fees		562			567			1,683			1,740
	Mortgage banking service fees		434			403			1,280			1,154
	Change in value of mortgage servicing rights		181			(681	)		311			(1,514	)
	Total service charges and fees		6,662			5,783			19,284			17,890
	Gain on sale of loans		1,083			1,430			4,967			4,317
	Commissions on sale of non-deposit investment products		692			803			2,294			2,464
	Increase in cash value of life insurance		531			450			1,337			1,350
	Change in indemnification asset		(461	)		(94	)		(876	)		215
	Gain on sale of foreclosed assets		313			419			1,479			364
	Sale of customer checks		97			90			280			256
	Lease brokerage income		75			80			273			228
	Gain (loss) on disposal of fixed assets		2			(16	)		(12	)		(404	)
	Commission rebates		—			(17	)		—			(51	)
	Gain on life insurance death benefit		—			—			—			600
	Other		133			199			166			740
	Total other noninterest income		2,465			3,344			10,192			10,079
	Total noninterest income	$	9,127		$	9,127		$	29,476		$	27,969
Components of Noninterest Expense	'
	The components of noninterest expense were as follows (in thousands):
		Three months ended						Nine months ended
		September 30,						September 30,
		2013			2012			2013			2012
	Base salaries, net of deferred loan origination costs	$	8,716		$	8,337		$	25,572		$	24,769
	Incentive compensation		1,166			1,254			3,751			3,976
	Benefits and other compensation costs		2,979			2,771			9,389			8,869
	Total salaries and benefits expense		12,861			12,362			38,712			37,614
	Occupancy		1,925			1,851			5,337			5,424
	Equipment		1,089			1,138			3,036			3,381
	Data processing and software		1,184			1,017			3,542			3,589
	ATM network charges		626			529			1,801			1,628
	Telecommunications		629			553			1,741			1,675
	Postage		269			230			633			704
	Courier service		217			270			639			715
	Advertising		492			710			1,232			2,071
	Assessments		572			590			1,721			1,786
	Operational losses		137			171			376			430
	Professional fees		741			832			1,885			1,946
	Foreclosed assets expense		48			284			310			1,076
	Provision for foreclosed asset losses		47			433			620			1,520
	Change in reserve for unfunded commitments		(335	)		(35	)		(740	)		(185	)
	Intangible amortization		53			52			157			157
	Legal settlement		339			2,090			339			2,090
	Other		2,722			2,513			7,385			7,251
	Total other noninterest expense		10,755			13,228			30,014			35,258
	Total noninterest expense	$	23,616		$	25,590		$	68,726		$	72,872

Income_Taxes_Tables

Income Taxes (Tables)	9 Months Ended
	Sep. 30, 2013
Income Tax Disclosure [Abstract]	'
Reconciliation of Effective Tax Rate and Statutory Federal Income Tax Rate	'
	The effective tax rate and the statutory federal income tax rate are reconciled for the periods indicated as follows:
		Three months ended						Nine months ended
		September 30,						September 30,
		2013			2012			2013			2012
	Federal statutory income tax rate		35	%		35	%		35	%		35	%
	State income taxes, net of federal tax benefit		6.7	%		6.9	%		6.7	%		6.6	%
	Tax-exempt interest on municipal obligations		(0.5	%)		(0.4	%)		(0.4	%)		(0.5	%)
	Increase in cash value of insurance policies		(1.5	%)		(1.8	%)		(1.3	%)		(2.0	%)
	Other		0.3	%		2.2	%		0.4	%		0.9	%
	Effective Tax Rate		40	%		41.9	%		40.4	%		40	%

Earnings_Per_Share_Tables

Earnings Per Share (Tables)	9 Months Ended
	Sep. 30, 2013
Earnings Per Share [Abstract]	'
Computation of Earnings per Share	'
	Earnings per share have been computed based on the following:
		Three months ended				Nine months ended
		September 30,				September 30,
	(in thousands)	2013		2012		2013		2012
	Net income	$	7,361	$	5,020	$	22,163	$	14,272
	Average number of common shares outstanding		16,074		15,993		16,035		15,989
	Effect of dilutive stock options		156		59		117		61
	Average number of common shares outstanding used to calculate diluted earnings per share		16,230		16,052		16,152		16,050
	Options excluded from diluted earnings per share because the effect of these options was antidilutive		171		992		544		967

Comprehensive_Income_Tables

Comprehensive Income (Tables)	9 Months Ended
	Sep. 30, 2013
Equity [Abstract]	'
Components of Other Comprehensive Income and Related Tax Effects	'
	The components of other comprehensive income and related tax effects are as follows:
		Three months ended						Nine months ended
		September 30,						September, 30
		2013			2012			2013			2012
	(in thousands)
	Unrealized holding gains (losses) on available-for-sale securities	$	144		$	168		$	(3,498	)	$	(304	)
	Tax effect		(61	)		(70	)		1,471			128
	Unrealized holding gains (losses) on available-for-sale securities, net of tax	$	83		$	98		$	(2,027	)	$	(176	)
Components of Accumulated Other Comprehensive Income	'
	The components of accumulated other comprehensive income, included in shareholders’ equity, are as follows:
		September 30,			December 31,
		2013			2012
		(In thousands)
	Net unrealized gains on available-for-sale securities	$	4,936		$	8,434
	Tax effect		(2,076	)		(3,547	)
	Unrealized holding gains on available-for-sale securities, net of tax		2,860			4,887
	Pension liability		(3,806	)		(3,806	)
	Tax effect		1,600			1,600
	Pension liability, net of tax		(2,206	)		(2,206	)
	Joint beneficiary agreement liability		(522	)		(522	)
	Tax effect		—			—
	Joint beneficiary agreement liability, net of tax		(522	)		(522	)
	Accumulated other comprehensive income (loss)	$	132		$	2,159

Retirement_Plans_Tables

Retirement Plans (Tables)	9 Months Ended
	Sep. 30, 2013
Compensation And Retirement Disclosure [Abstract]	'
Net Periodic Benefit Cost Recognized for the Plans	'
	The following table sets forth the net periodic benefit cost recognized for the plans:
		Three months ended				Nine months ended
	(In thousands)	September 30,				September 30,
		2013		2012		2013		2013
	Net pension cost included the following components:
	Service cost-benefits earned during the period	$	187	$	170	$	557	$	510
	Interest cost on projected benefit obligation		161		172		482		515
	Amortization of net obligation at transition		—		—		1		1
	Amortization of prior service cost		39		38		115		115
	Recognized net actuarial loss		73		72		218		216
	Net periodic pension cost	$	460	$	452	$	1,373	$	1,357
	Company contributions to pension plans	$	151	$	106	$	411	$	366
	Pension plan payouts to participants	$	151	$	106	$	411	$	366

Related_Party_Transactions_Tab

Related Party Transactions (Tables)	9 Months Ended
	Sep. 30, 2013
Related Party Transactions [Abstract]	'
Summary of Loan Activity	'
	The following table summarizes the activity in these loans for the periods indicated (in thousands):
	Balance December 31, 2011	$	1,764
	Advances/new loans		1,568
	Removed/payments		(964	)
	Balance December 31, 2012	$	2,368
	Advances/new loans		277
	Removed/payments		(1,071	)
	Balance September 30, 2013	$	1,574

Fair_Value_Measurement_Tables

Fair Value Measurement (Tables)	9 Months Ended
	Sep. 30, 2013
Fair Value Disclosures [Abstract]	'
Recorded Amount of Assets and Liabilities Measured at Fair Value on Recurring Basis	'
	The table below presents the recorded amount of assets and liabilities measured at fair value on a recurring basis (in thousands):
	Fair value at September 30, 2013	Total		Level 1			Level 2				Level 3
	Investment securities available for sale:
	Obligations of U.S. government corporations and agencies	$	105,401		—		$	105,401				—
	Obligations of states and political subdivisions		7,905		—			7,905				—
	Corporate debt securities		1,909		—			1,909				—
	Mortgage servicing rights		6,049		—			—			$	6,049
	Total assets measured at fair value	$	121,264				$	115,215			$	6,049
	Fair value at December 31, 2012	Total		Level 1			Level 2				Level 3
	Investment securities available for sale:
	Obligations of U.S. government corporations and agencies	$	151,701		—		$	151,701				—
	Obligations of states and political subdivisions		9,421		—			9,421				—
	Corporate debt securities		1,905		—			1,905				—
	Mortgage servicing rights		4,552		—			—			$	4,552
	Total assets measured at fair value	$	167,579		—		$	163,027			$	4,552
Reconciliation of Assets and Liabilities Measured at Fair Value Using Significant Unobservable Inputs (Level 3) on Recurring Basis	'
	The following tables provide a reconciliation of assets and liabilities measured at fair value using significant unobservable inputs (Level 3) on a recurring basis during the three and nine months ended September 30, 2013 and 2012. Had there been any transfer into or out of Level 3 during 2013 or 2012, the amount included in the “Transfers into (out of) Level 3” column would represent the beginning balance of an item in the period (interim quarter) during which it was transferred (in thousands):
							Change
		Beginning		Transfers			Included						Ending
	Three months ended September 30,	Balance		into Level 3			in Earnings				Issuances		Balance
	2013: Mortgage servicing rights	$	5,571		—		$	180			$	298	$	6,049
	2012: Mortgage servicing rights	$	4,757		—		$	(681	)		$	409	$	4,485
							Change
		Beginning		Transfers			Included						Ending
	Nine months ended September 30,	Balance		into Level 3			in Earnings				Issuances		Balance
	2013: Mortgage servicing rights	$	4,552		—		$	310			$	1,187	$	6,049
	2012: Mortgage servicing rights	$	4,603		—		$	(1,513	)		$	1,395	$	4,485
Quantitative Information about Recurring Level 3 Fair Value Measurements	'
	The following table presents quantitative information about recurring Level 3 fair value measurements at September 30, 2013:
		Fair Value		Valuation			Unobservable		Range,
		(in thousands)		Technique			Inputs		Weighted Average
	Mortgage Servicing Rights	$	6,049		Discounted cash flow		Constant prepayment rate			6.9% - 33.0%, 11.0%
							Discount rate			10.0% - 10.0%, 10.0%
Assets and Liabilities Measured at Fair Value on Nonrecurring Basis	'
	The tables below present the recorded amount of assets and liabilities measured at fair value on a nonrecurring basis, as of the dates indicated, that had a write-down or an additional allowance provided during the periods indicated (in thousands):
	September 30, 2013	Total		Level 1			Level 2				Level 3
	Fair value:
	Impaired Originated & PNCI loans	$	22,638		—			—			$	22,638
	Foreclosed assets		2,049		—			—				2,049
	Total assets measured at fair value	$	24,687		—			—			$	24,687
	September 30, 2012	Total		Level 1			Level 2				Level 3
	Fair value:
	Impaired Originated & PNCI loans	$	18,241		—			—			$	18,241
	Foreclosed assets		10,185		—			—				10,185
	Total assets measured at fair value	$	28,426		—			—			$	28,426
Losses Resulting from Nonrecurring Fair Value Adjustments that Occurred in Periods Indicated	'
	The following table presents the losses resulting from nonrecurring fair value adjustments that occurred in the periods indicated:
		Three months ended					Nine months ended
		September 30,					September 30,
	(in thousands)	2013		2012			2013				2012
	Impaired Originated & PNCI loans	$	258	$	655		$	2,836			$	1,317
	Foreclosed assets		—		433			531				1,520
	Total loss from nonrecurring fair value adjustments	$	258	$	1,088		$	3,367			$	2,837
Quantitative Information about Level 3 Fair Value Measurements for Financial Instruments Measured at Fair Value on Nonrecurring Basis	'
	The following table presents quantitative information about Level 3 fair value measurements for financial instruments measured at fair value on a nonrecurring basis at September 30, 2013:
		Fair Value		Valuation		Unobservable	Range,
		(in thousands)		Technique		Inputs	Weighted Average
	Impaired Originated & PNCI Loans	$	22,638	Sales comparison		Adjustment for differences		5.0% - 41.0%, 9.33%
				approach Income		between comparable sales		6.7% - 9.00%, 8.99%
				approach		Capitalization rate
	Foreclosed assets	$	2,049	Sales comparison		Adjustment for differences		5.0% - 5.0%, 5.0%
				approach		between comparable sales
Estimated Fair Values of Financial Instruments that are Reported at Amortized Cost in Consolidated Balance Sheets	'
	The estimated fair values of financial instruments that are reported at amortized cost in the Corporation’s consolidated balance sheets, segregated by the level of the valuation inputs within the fair value hierarchy utilized to measure fair value, were as follows (in thousands):
		September 30, 2013					December 31, 2012
		Carrying		Fair			Carrying				Fair
		Amount		Value			Amount				Value
	Financial assets:
	Level 1 inputs:
	Cash and due from banks	$	69,173	$	69,173		$	81,086			$	81,086
	Cash at Federal Reserve and other banks		471,977		471,977			667,813				667,813
	Level 2 inputs:471,977
	Restricted equity securities		9,163		9,163			9,647				9,647
	Loans held for sale		3,247		3,247			12,053				12,053
	Accrued interest receivable		6,450		6,450			6,636				6,636
	Level 3 inputs:
	Loans, net		1,617,711		1,714,658			1,522,175				1,607,044
	Indemnification asset		861		861			1,997				1,997
	Financial liabilities:
	Level 2 inputs:
	Deposits		2,293,311		2,294,425			2,289,702				2,291,841
	Accrued interest payable		937		937			1,036				1,036
	Other borrowings		14,626		14,626			9,197				9,197
	Junior subordinated debt		41,238		25,980			41,238				28,042
		Contract		Fair			Contract				Fair
		Amount		Value			Amount				Value
	Off-balance sheet:
	Level 3 inputs:
	Commitments	$	530,417	$	5,304		$	557,254			$	5,573
	Standby letters of credit		2,013		20			2,905				29
	Overdraft privilege commitments		70,424		704			69,675				697

TriCo_Bancshares_Condensed_Fin1

TriCo Bancshares Condensed Financial Statements (Parent Only) (Tables)	9 Months Ended
	Sep. 30, 2013
Condensed Financial Information Of Parent Company Only Disclosure [Abstract]	'
Condensed Balance Sheets	'
	Condensed Balance Sheets							September 30,			December 31,
								2013			2012
								(In thousands)
	Assets
	Cash and Cash equivalents							$	2,489		$	2,511
	Investment in Tri Counties Bank								283,228			267,118
	Other assets								1,238			1,238
	Total assets							$	286,955		$	270,867
	Liabilities and shareholders’ equity
	Other liabilities							$	265		$	270
	Junior subordinated debt								41,238			41,238
	Total liabilities								41,503			41,508
	Shareholders’ equity:
	Common stock, no par value: authorized 50,000,000 shares; issued and outstanding 16,076,662 and 16,000,838 shares, respectively								89,054			85,561
	Retained earnings								156,266			141,639
	Accumulated other comprehensive loss, net								132			2,159
	Total shareholders’ equity								245,452			229,359
	Total liabilities and shareholders’ equity							$	286,955		$	270,867
Condensed Statements of Income	'
	Statements of Income	Three months ended Sept. 30,						Nine months ended Sept. 30,
	(In thousands)	2013			2012			2013			2012
	Interest expense	$	314		$	333		$	936		$	1,003
	Administration expense		191			131			568			445
	Loss before equity in net income of Tri Counties Bank		(505	)		(464	)		(1,504	)		(1,448	)
	Equity in net income of Tri Counties Bank:
	Distributed		2,300			1,550			6,080			6,872
	(Over) under distributed		5,354			3,739			16,955			8,244
	Income tax benefit		212			195			632			604
	Net income	$	7,361		$	5,020		$	22,163		$	14,272
Condensed Statements of Comprehensive Income	'
	Statements of Comprehensive Income	Three months ended Sept. 30,						Nine months ended Sept. 30,
	(In thousands)	2013			2012			2013			2012
	Net income	$	7,361		$	5,020		$	22,163		$	14,272
	Other comprehensive income, net of tax:
	Unrealized holding gains (losses) on securities arising during the period		83			98			(2,027	)		(176	)
	Other comprehensive loss		83			98			(2,027	)		(176	)
	Comprehensive income	$	7,444		$	5,118		$	20,136		$	14,096
Condensed Statements of Cash Flows	'
	Statements of Cash Flows							Nine months ended Sept. 30,
	(In thousands)							2013			2012
	Operating activities:
	Net income							$	22,163		$	14,272
	Adjustments to reconcile net income to net cash provided by operating activities:
	Over (under) distributed equity in earnings of Tri Counties Bank								(16,955	)		(8,244	)
	Stock option vesting expense								849			800
	Stock option excess tax benefits								(356	)		(21	)
	Net change in other assets and liabilities								(853	)		(747	)
	Net cash provided by operating activities								4,848			6,060
	Investing activities: None
	Financing activities:
	Issuance of common stock through option exercise								356			156
	Stock option excess tax benefits								251			21
	Repurchase of common stock								(501	)		(48	)
	Cash dividends paid — common								(4,976	)		(4,317	)
	Net cash used for financing activities								(4,870	)		(4,188	)
	(Decrease) increase in cash and cash equivalents								(22	)		1,872
	Cash and cash equivalents at beginning of year								2,511			706
	Cash and cash equivalents at end of year							$	2,489		$	2,578

Regulatory_Matters_Tables

Regulatory Matters (Tables)	9 Months Ended
	Sep. 30, 2013
Banking And Thrift [Abstract]	'
Actual Capital Amounts and Ratios of the Bank	'
	To be categorized as well capitalized the Bank must maintain minimum total risk-based, Tier 1 risk-based and Tier 1 leverage ratios as set forth in the table below. The Bank’s actual capital amounts and ratios are also presented in the table.
												Minimum to be Well
												Capitalized Under
							Minimum					Prompt Corrective
		Actual					Capital Requirement					Action Provisions
		Amount		Ratio			Amount		Ratio			Amount		Ratio
		(dollars in thousands)
	As of September 30, 2013:
	Total Capital (to Risk Weighted Assets):
	Consolidated	$	293,093		14.88	%	$	157,533		8	%		N/A		N/A
	Tri Counties Bank	$	290,852		14.78	%	$	157,432		8	%	$	196,916		10	%
	Tier 1 Capital (to Risk Weighted Assets):
	Consolidated	$	268,261		13.62	%	$	78,766		4	%		N/A		N/A
	Tri Counties Bank	$	266,036		13.52	%	$	78,716		4	%	$	118,149		6	%
	Tier 1 Capital (to Average Assets):
	Consolidated	$	268,261		10.37	%	$	103,447		4	%		N/A		N/A
	Tri Counties Bank	$	266,036		10.29	%	$	103,395		4	%	$	129,309		5	%
	As of December 31, 2012:
	Total Capital (to Risk Weighted Assets):
	Consolidated	$	273,979		14.53	%	$	150,896		8	%		N/A		N/A
	Tri Counties Bank	$	271,723		14.42	%	$	150,796		8	%	$	188,495		10	%
	Tier 1 Capital (to Risk Weighted Assets):
	Consolidated	$	250,133		13.27	%	$	75,448		4	%		N/A		N/A
	Tri Counties Bank	$	247,892		13.16	%	$	75,398		4	%	$	113,097		6	%
	Tier 1 Capital (to Average Assets):
	Consolidated	$	250,133		9.82	%	$	101,918		4	%		N/A		N/A
	Tri Counties Bank	$	247,892		9.73	%	$	101,866		4	%	$	127,333		5	%

Summary_of_Quarterly_Results_o1

Summary of Quarterly Results of Operations (unaudited) (Tables)	9 Months Ended
	Sep. 30, 2013
Quarterly Financial Information Disclosure [Abstract]	'
Results of Operations	'
	The following table sets forth the results of operations for the quarters of 2013 and 2012, and is unaudited; however, in the opinion of Management, it reflects all adjustments (which include only normal recurring adjustments) necessary to present fairly the summarized results for such periods.
		2013 Quarters Ended
		December 31,		September 30,			June 30,		March 31,
		(In thousands, except per share data)
	Interest and dividend income:
	Loans:
	Discount accretion PCI – cash basis			$	140		$	129	$	167
	Discount accretion PCI – other				898			732		597
	Discount accretion PNCI				1,115			815		766
	All other loan interest income				22,970			22,207		22,542
	Total loan interest income				25,123			23,883		24,072
	Debt securities, dividends and interest bearing cash at Banks (not FTE)				2,413			1,873		1,734
	Total interest income				27,536			25,756		25,806
	Interest expense				1,169			1,167		1,237
	Net interest income				26,367			24,589		24,569
	Reversal of provision for loan losses				(393	)		614		(1,108	)
	Net interest income after provision for loan losses				26,760			23,975		25,677
	Noninterest income				9,127			10,131		10,218
	Noninterest expense				23,616			23,509		21,601
	Income before income taxes				12,271			10,597		14,294
	Income tax expense				4,910			4,272		5,817
	Net income			$	7,361		$	6,325	$	8,477
	Per common share:
	Net income (diluted)			$	0.45		$	0.39	$	0.53
	Dividends			$	0.11		$	0.11	$	0.09
		2012 Quarters Ended
		December 31,		September 30,			June 30,		March 31,
		(In thousands, except per share data)
	Interest and dividend income:
	Loans:
	Discount accretion PCI – cash basis	$	42	$	24		$	108	$	18
	Discount accretion PCI – other		979		1,192			886		776
	Discount accretion PNCI		841		591			1,391		1,286
	All other loan interest income		22,383		23,723			23,407		22,849
	Total loan interest income		24,245		25,530			25,792		24,929
	Debt securities, dividends and interest bearing cash at Banks (not FTE)		1,898		1,935			2,152		2,235
	Total interest income		26,143		27,465			27,944		27,164
	Interest expense		1,372		1,834			2,010		2,128
	Net interest income		24,771		25,631			25,934		25,036
	Provision for loan losses		1,524		532			3,371		3,996
	Net interest income after provision for loan losses		23,247		25,099			22,563		21,040
	Noninterest income		10,011		9,127			10,577		8,265
	Noninterest expense		25,126		25,590			24,367		22,915
	Income before income taxes		8,132		8,636			8,773		6,390
	Income tax expense		3,410		3,616			3,452		2,459
	Net income	$	4,722	$	5,020		$	5,321	$	3,931
	Per common share:
	Net income (diluted)	$	0.29	$	0.31		$	0.33	$	0.25
	Dividends	$	0.09	$	0.09		$	0.09	$	0.09

Summary_of_Significant_Account2

Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)

3 Months Ended

9 Months Ended

12 Months Ended

9 Months Ended

3 Months Ended

9 Months Ended

Sep. 30, 2013

Mar. 31, 2013

Sep. 30, 2012

Sep. 30, 2013

Sep. 30, 2012

Dec. 31, 2012

Jun. 30, 2013

Jun. 30, 2012

Dec. 31, 2011

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Mar. 31, 2012

Jun. 30, 2013

Mar. 31, 2013

Sep. 30, 2013

Trust

Furniture and Equipment [Member]

Furniture and Equipment [Member]

Land Improvements and Buildings [Member]

Land Improvements and Buildings [Member]

Change in Accounting Method Accounted for as Change in Estimate [Member]

Impaired Real Estate Collateral Dependent Loans [Member]

Impaired Real Estate Collateral Dependent Loans [Member]

Impaired Real Estate Collateral Dependent Loans [Member]

Tri Countries Bank [Member]

Segment

Minimum [Member]

Maximum [Member]

Minimum [Member]

Maximum [Member]

Branches

Significant Of Accounting Policies [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Number of traditional operating branches

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

41

Number of in-store operating branches

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

24

Number of subsidiary business trusts

'

'

'

2

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Number of business segment

'

'

'

1

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Investment securities held to maturity

$193,262,000

$0

'

$193,262,000

'

$0

'

'

'

'

'

'

'

'

'

'

'

'

Recognized OTTI losses

'

'

'

0

'

0

'

'

'

'

'

'

'

'

'

'

'

'

Loans contractual past due

'

'

'

'90 days

'

'

'

'

'

'

'

'

'

'

'

'

'

'

TDR loans payment period in nonaccrual status

'

'

'

'6 months

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Net reduction calculated allowance for loan losses

393,000

'

-532,000

887,000

-7,899,000

-9,423,000

'

'

'

'

'

'

'

'

1,388,000

'

'

'

Method used to estimate net sale proceeds

'

'Greater of fifteen percent or actual estimated selling costs

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Allowance for loan losses

39,340,000

'

44,146,000

39,340,000

44,146,000

42,648,000

39,599,000

45,849,000

45,914,000

'

'

'

'

1,665,000

'

1,314,000

494,000

'

Estimated useful lives of the related assets or lease terms

'

'

'

'

'

'

'

'

'

'3 years

'10 years

'15 years

'40 years

'

'

'

'

'

Reserve for unfunded commitments due to change in methodology

'

'

'

'

'

'

$335,000

'

'

'

'

'

'

'

'

'

'

'

Business_Combinations_Addition

Business Combinations - Additional Information (Detail)	9 Months Ended
	Sep. 30, 2013
Business Acquisition [Line Items]	'
Maximum period of accrued interest on loan under agreement	'90 days
Granite [Member]	'
Business Acquisition [Line Items]	'
FDIC losses	80.00%
Loss recoveries on the covered assets acquired	80.00%
Loss sharing arrangements, Minimum	'5 years
Loss sharing arrangements, Maximum	'10 years
Loss recovery provisions, Minimum	'8 years
Loss recovery provisions, Maximum	'10 years

Investment_Securities_Amortize

Investment Securities - Amortized Cost and Estimated Fair Values of Investments in Debt and Equity Securities (Detail) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Schedule of Available-for-sale Securities [Line Items]	'	'
Amortized Cost	$110,279	$154,593
Gross Unrealized Gains	5,134	8,434
Gross Unrealized Losses	-198	'
Estimated Fair Value	115,215	163,027
Amortized Cost, Held to Maturity	193,262	'
Gross Unrealized Gains, Held to Maturity	1,299	'
Gross Unrealized Losses, Held to Maturity	-4,320	'
Estimated Fair Value, Held to Maturity	190,241	'
Obligations of U.S. government corporations and agencies [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Amortized Cost	100,629	143,633
Gross Unrealized Gains	4,970	8,068
Gross Unrealized Losses	-198	'
Estimated Fair Value	105,401	151,701
Amortized Cost, Held to Maturity	180,612	'
Gross Unrealized Gains, Held to Maturity	1,299	'
Gross Unrealized Losses, Held to Maturity	-2,905	'
Estimated Fair Value, Held to Maturity	179,006	'
Obligations of states and political subdivisions [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Amortized Cost	7,777	9,098
Gross Unrealized Gains	128	323
Gross Unrealized Losses	'	'
Estimated Fair Value	7,905	9,421
Amortized Cost, Held to Maturity	12,650	'
Gross Unrealized Gains, Held to Maturity	'	'
Gross Unrealized Losses, Held to Maturity	-1,415	'
Estimated Fair Value, Held to Maturity	11,235	'
Corporate debt securities [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Amortized Cost	1,873	1,862
Gross Unrealized Gains	36	43
Gross Unrealized Losses	'	'
Estimated Fair Value	$1,909	$1,905

Investment_Securities_Addition

Investment Securities - Additional Information (Detail) (USD $)	9 Months Ended	12 Months Ended
	Sep. 30, 2013	Dec. 31, 2012
	Investmentsecurities	Investmentsecurities
	Securities	Securities
Investment Securities [Line Items]	'	'
Investment securities sold	0	0
Investment securities carrying value	$66,442,000	$66,911,000
Life of mortgage-backed securities	'5 years 7 months 6 days	'
Investment securities with gross unrealized losses	'	0
Obligations of U.S. government corporations and agencies [Member]	'	'
Investment Securities [Line Items]	'	'
Mortgage-backed securities	$281,241,000	'
Debt securities	10	'
Percentage of aggregate depreciation in unrealized losses	3.73%	'
Obligations of states and political subdivisions [Member]	'	'
Investment Securities [Line Items]	'	'
Debt securities	14	'
Percentage of aggregate depreciation in unrealized losses	11.19%	'

Investment_Securities_Amortize1

Investment Securities - Amortized Cost and Estimated Fair Value of Debt Securities by Contractual Maturity (Detail) (USD $)	Sep. 30, 2013	Mar. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Investments Debt And Equity Securities [Abstract]	'	'	'
Due in one year, Amortized Cost	$2,554	'	'
Due after one year through five years, Amortized Cost	4,514	'	'
Due after five years through ten years, Amortized Cost	34,963	'	'
Due after ten years, Amortized Cost	68,248	'	'
Totals, Amortized Cost	110,279	'	'
Due in one year, Amortized Cost, Held to Maturity	'	'	'
Due after one year through five years, Amortized Cost, Held to Maturity	'	'	'
Due after five years through ten years, Amortized Cost, Held to Maturity	'	'	'
Due after ten years, Amortized Cost, Held to Maturity	193,262	'	'
Totals, Amortized Cost, Held to Maturity	193,262	0	0
Due in one year, Estimated Fair Value	2,594	'	'
Due after one year through five years, Estimated Fair Value	4,699	'	'
Due after five years through ten years, Estimated Fair Value	36,190	'	'
Due after ten years, Estimated Fair Value	71,732	'	'
Totals, Estimated Fair Value	115,215	'	'
Due in one year, Estimated Fair Value, Held to Maturity	'	'	'
Due after one year through five years, Estimated Fair Value, Held to Maturity	'	'	'
Due after five years through ten years, Estimated Fair Value, Held to Maturity	'	'	'
Due after ten years, Estimated Fair Value, Held to Maturity	190,241	'	'
Estimated Fair Value, Held to Maturity	$190,241	'	'

Investment_Securities_Gross_Un

Investment Securities - Gross Unrealized Losses on Investment (Detail) (USD $)	Sep. 30, 2013
In Thousands, unless otherwise specified
Schedule of Available-for-sale Securities [Line Items]	'
Less than 12 months, Fair Value	$10,962
Less than 12 months, Unrealized Loss	-198
12 months or more, Fair Value	'
12 months or more, Unrealized Loss	'
Total Fair Value	10,962
Total Unrealized Loss	-198
Less than 12 months, Fair Value, Held to Maturity	80,428
Less than 12 months, Unrealized Loss, Held to Maturity	-4,320
12 months or more, Fair Value, Held to Maturity	'
12 months or more, Unrealized Loss, Held to Maturity	'
Total Fair Value, Held to Maturity	80,428
Total Unrealized Loss, Held to Maturity	-4,320
Obligations of U.S. government corporations and agencies [Member]	'
Schedule of Available-for-sale Securities [Line Items]	'
Less than 12 months, Fair Value	10,962
Less than 12 months, Unrealized Loss	-198
12 months or more, Fair Value	'
12 months or more, Unrealized Loss	'
Total Fair Value	10,962
Total Unrealized Loss	-198
Less than 12 months, Fair Value, Held to Maturity	69,193
Less than 12 months, Unrealized Loss, Held to Maturity	-2,905
12 months or more, Fair Value, Held to Maturity	'
12 months or more, Unrealized Loss, Held to Maturity	'
Total Fair Value, Held to Maturity	69,193
Total Unrealized Loss, Held to Maturity	-2,905
Obligations of states and political subdivisions [Member]	'
Schedule of Available-for-sale Securities [Line Items]	'
Less than 12 months, Fair Value	'
Less than 12 months, Unrealized Loss	'
12 months or more, Fair Value	'
12 months or more, Unrealized Loss	'
Total Fair Value	'
Total Unrealized Loss	'
Less than 12 months, Fair Value, Held to Maturity	11,235
Less than 12 months, Unrealized Loss, Held to Maturity	-1,415
12 months or more, Fair Value, Held to Maturity	'
12 months or more, Unrealized Loss, Held to Maturity	'
Total Fair Value, Held to Maturity	11,235
Total Unrealized Loss, Held to Maturity	-1,415
Corporate debt securities [Member]	'
Schedule of Available-for-sale Securities [Line Items]	'
Less than 12 months, Fair Value	'
Less than 12 months, Unrealized Loss	'
12 months or more, Fair Value	'
12 months or more, Unrealized Loss	'
Total Fair Value	'
Total Unrealized Loss	'

Loans_Summary_of_Loan_Balances

Loans - Summary of Loan Balances (Detail) (USD $)	Sep. 30, 2013	Jun. 30, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Dec. 31, 2011
In Thousands, unless otherwise specified
Mortgage loans on real estate:	'	'	'	'	'	'
Total mortgage loan on real estate	$1,091,475	'	$1,010,130	'	'	'
Consumer:	'	'	'	'	'	'
Total consumer loans	389,711	'	386,111	'	'	'
Commercial	133,616	'	135,528	'	'	'
Construction:	'	'	'	'	'	'
Total construction	42,249	'	33,054	'	'	'
Total loans, net of deferred loan fees	1,657,051	'	1,564,823	'	'	'
Total principal balance of loans owed-net of charge-offs	1,691,825	'	1,607,331	'	'	'
Unamortized net deferred loan fees	-3,311	'	-2,812	'	'	'
(Discounts) premiums, net, to principal balance of loans owed, net of charge-offs	-31,463	'	-39,696	'	'	'
Total loans, net of unamortized deferred loan fees	1,657,051	'	1,564,823	'	'	'
Noncovered loans	1,626,482	'	1,522,935	'	'	'
Covered loans	30,569	'	41,888	'	'	'
Total loans, net of unamortized deferred loan fees	1,657,051	'	1,564,823	'	'	'
Allowance for loan losses	-39,340	-39,599	-42,648	-44,146	-45,849	-45,914
Auto Indirect [Member]	'	'	'	'	'	'
Consumer:	'	'	'	'	'	'
Total consumer loans	1,351	'	3,816	'	'	'
Other [Member]	'	'	'	'	'	'
Consumer:	'	'	'	'	'	'
Total consumer loans	28,282	'	26,713	'	'	'
Residential 1-4 family [Member]	'	'	'	'	'	'
Mortgage loans on real estate:	'	'	'	'	'	'
Total mortgage loan on real estate	197,129	'	131,684	'	'	'
Commercial [Member]	'	'	'	'	'	'
Mortgage loans on real estate:	'	'	'	'	'	'
Total mortgage loan on real estate	894,346	'	878,446	'	'	'
Construction:	'	'	'	'	'	'
Total construction	14,648	'	14,595	'	'	'
Home equity lines of credit [Member]	'	'	'	'	'	'
Consumer:	'	'	'	'	'	'
Total consumer loans	346,348	'	342,025	'	'	'
Home equity loans [Member]	'	'	'	'	'	'
Consumer:	'	'	'	'	'	'
Total consumer loans	13,730	'	13,557	'	'	'
Residential [Member]	'	'	'	'	'	'
Construction:	'	'	'	'	'	'
Total construction	27,601	'	18,459	'	'	'
Originated [Member]	'	'	'	'	'	'
Mortgage loans on real estate:	'	'	'	'	'	'
Total mortgage loan on real estate	930,544	'	896,379	'	'	'
Consumer:	'	'	'	'	'	'
Total consumer loans	361,814	'	352,761	'	'	'
Commercial	126,034	'	125,122	'	'	'
Construction:	'	'	'	'	'	'
Total construction	40,443	'	23,073	'	'	'
Total loans, net of deferred loan fees	1,458,835	'	1,397,335	'	'	'
Total principal balance of loans owed-net of charge-offs	1,462,146	'	1,400,147	'	'	'
Unamortized net deferred loan fees	-3,311	'	-2,812	'	'	'
(Discounts) premiums, net, to principal balance of loans owed, net of charge-offs	'	'	'	'	'	'
Total loans, net of unamortized deferred loan fees	1,458,835	'	1,397,335	'	'	'
Noncovered loans	1,458,835	'	1,397,335	'	'	'
Covered loans	'	'	'	'	'	'
Total loans, net of unamortized deferred loan fees	1,458,835	'	1,397,335	'	'	'
Allowance for loan losses	-32,307	'	-35,769	'	'	'
Originated [Member] | Auto Indirect [Member]	'	'	'	'	'	'
Consumer:	'	'	'	'	'	'
Total consumer loans	1,351	'	3,816	'	'	'
Originated [Member] | Other [Member]	'	'	'	'	'	'
Consumer:	'	'	'	'	'	'
Total consumer loans	26,106	'	24,263	'	'	'
Originated [Member] | Residential 1-4 family [Member]	'	'	'	'	'	'
Mortgage loans on real estate:	'	'	'	'	'	'
Total mortgage loan on real estate	128,974	'	121,255	'	'	'
Originated [Member] | Commercial [Member]	'	'	'	'	'	'
Mortgage loans on real estate:	'	'	'	'	'	'
Total mortgage loan on real estate	801,570	'	775,124	'	'	'
Construction:	'	'	'	'	'	'
Total construction	14,074	'	11,196	'	'	'
Originated [Member] | Home equity lines of credit [Member]	'	'	'	'	'	'
Consumer:	'	'	'	'	'	'
Total consumer loans	321,512	'	311,671	'	'	'
Originated [Member] | Home equity loans [Member]	'	'	'	'	'	'
Consumer:	'	'	'	'	'	'
Total consumer loans	12,845	'	13,011	'	'	'
Originated [Member] | Residential [Member]	'	'	'	'	'	'
Construction:	'	'	'	'	'	'
Total construction	26,369	'	11,877	'	'	'
PNCI [Member]	'	'	'	'	'	'
Mortgage loans on real estate:	'	'	'	'	'	'
Total mortgage loan on real estate	123,912	'	77,503	'	'	'
Consumer:	'	'	'	'	'	'
Total consumer loans	16,749	'	19,548	'	'	'
Commercial	775	'	869	'	'	'
Construction:	'	'	'	'	'	'
Total construction	'	'	'	'	'	'
Total loans, net of deferred loan fees	141,436	'	97,920	'	'	'
Total principal balance of loans owed-net of charge-offs	150,042	'	111,286	'	'	'
Unamortized net deferred loan fees	'	'	'	'	'	'
(Discounts) premiums, net, to principal balance of loans owed, net of charge-offs	-8,606	'	-13,366	'	'	'
Total loans, net of unamortized deferred loan fees	141,436	'	97,920	'	'	'
Noncovered loans	141,436	'	97,920	'	'	'
Covered loans	'	'	'	'	'	'
Total loans, net of unamortized deferred loan fees	141,436	'	97,920	'	'	'
Allowance for loan losses	-2,800	'	-1,969	'	'	'
PNCI [Member] | Auto Indirect [Member]	'	'	'	'	'	'
Consumer:	'	'	'	'	'	'
Total consumer loans	'	'	'	'	'	'
PNCI [Member] | Other [Member]	'	'	'	'	'	'
Consumer:	'	'	'	'	'	'
Total consumer loans	2,101	'	2,418	'	'	'
PNCI [Member] | Residential 1-4 family [Member]	'	'	'	'	'	'
Mortgage loans on real estate:	'	'	'	'	'	'
Total mortgage loan on real estate	61,808	'	5,413	'	'	'
PNCI [Member] | Commercial [Member]	'	'	'	'	'	'
Mortgage loans on real estate:	'	'	'	'	'	'
Total mortgage loan on real estate	62,104	'	72,090	'	'	'
Construction:	'	'	'	'	'	'
Total construction	'	'	'	'	'	'
PNCI [Member] | Home equity lines of credit [Member]	'	'	'	'	'	'
Consumer:	'	'	'	'	'	'
Total consumer loans	14,367	'	16,788	'	'	'
PNCI [Member] | Home equity loans [Member]	'	'	'	'	'	'
Consumer:	'	'	'	'	'	'
Total consumer loans	281	'	342	'	'	'
PNCI [Member] | Residential [Member]	'	'	'	'	'	'
Construction:	'	'	'	'	'	'
Total construction	'	'	'	'	'	'
PCI- Cash basis [Member]	'	'	'	'	'	'
Mortgage loans on real estate:	'	'	'	'	'	'
Total mortgage loan on real estate	'	'	1,289	'	'	'
Consumer:	'	'	'	'	'	'
Total consumer loans	6,501	'	7,661	'	'	'
Commercial	25	'	22	'	'	'
Construction:	'	'	'	'	'	'
Total construction	'	'	'	'	'	'
Total loans, net of deferred loan fees	6,526	'	8,972	'	'	'
Total principal balance of loans owed-net of charge-offs	17,398	'	20,621	'	'	'
Unamortized net deferred loan fees	'	'	'	'	'	'
(Discounts) premiums, net, to principal balance of loans owed, net of charge-offs	-10,872	'	-11,649	'	'	'
Total loans, net of unamortized deferred loan fees	6,526	'	8,972	'	'	'
Noncovered loans	6,526	'	8,972	'	'	'
Covered loans	'	'	'	'	'	'
Total loans, net of unamortized deferred loan fees	6,526	'	8,972	'	'	'
Allowance for loan losses	-899	'	-1,054	'	'	'
PCI- Cash basis [Member] | Auto Indirect [Member]	'	'	'	'	'	'
Consumer:	'	'	'	'	'	'
Total consumer loans	'	'	'	'	'	'
PCI- Cash basis [Member] | Other [Member]	'	'	'	'	'	'
Consumer:	'	'	'	'	'	'
Total consumer loans	'	'	'	'	'	'
PCI- Cash basis [Member] | Residential 1-4 family [Member]	'	'	'	'	'	'
Mortgage loans on real estate:	'	'	'	'	'	'
Total mortgage loan on real estate	'	'	'	'	'	'
PCI- Cash basis [Member] | Commercial [Member]	'	'	'	'	'	'
Mortgage loans on real estate:	'	'	'	'	'	'
Total mortgage loan on real estate	'	'	1,289	'	'	'
Construction:	'	'	'	'	'	'
Total construction	'	'	'	'	'	'
PCI- Cash basis [Member] | Home equity lines of credit [Member]	'	'	'	'	'	'
Consumer:	'	'	'	'	'	'
Total consumer loans	6,452	'	7,612	'	'	'
PCI- Cash basis [Member] | Home equity loans [Member]	'	'	'	'	'	'
Consumer:	'	'	'	'	'	'
Total consumer loans	49	'	49	'	'	'
PCI- Cash basis [Member] | Residential [Member]	'	'	'	'	'	'
Construction:	'	'	'	'	'	'
Total construction	'	'	'	'	'	'
PCI- Other [Member]	'	'	'	'	'	'
Mortgage loans on real estate:	'	'	'	'	'	'
Total mortgage loan on real estate	37,019	'	34,959	'	'	'
Consumer:	'	'	'	'	'	'
Total consumer loans	4,647	'	6,141	'	'	'
Commercial	6,782	'	9,515	'	'	'
Construction:	'	'	'	'	'	'
Total construction	1,806	'	9,981	'	'	'
Total loans, net of deferred loan fees	50,254	'	60,596	'	'	'
Total principal balance of loans owed-net of charge-offs	62,239	'	75,277	'	'	'
Unamortized net deferred loan fees	'	'	'	'	'	'
(Discounts) premiums, net, to principal balance of loans owed, net of charge-offs	-11,985	'	-14,681	'	'	'
Total loans, net of unamortized deferred loan fees	50,254	'	60,596	'	'	'
Noncovered loans	19,685	'	18,708	'	'	'
Covered loans	30,569	'	41,888	'	'	'
Total loans, net of unamortized deferred loan fees	50,254	'	60,596	'	'	'
Allowance for loan losses	-3,334	'	-3,856	'	'	'
PCI- Other [Member] | Auto Indirect [Member]	'	'	'	'	'	'
Consumer:	'	'	'	'	'	'
Total consumer loans	'	'	'	'	'	'
PCI- Other [Member] | Other [Member]	'	'	'	'	'	'
Consumer:	'	'	'	'	'	'
Total consumer loans	75	'	32	'	'	'
PCI- Other [Member] | Residential 1-4 family [Member]	'	'	'	'	'	'
Mortgage loans on real estate:	'	'	'	'	'	'
Total mortgage loan on real estate	6,347	'	5,016	'	'	'
PCI- Other [Member] | Commercial [Member]	'	'	'	'	'	'
Mortgage loans on real estate:	'	'	'	'	'	'
Total mortgage loan on real estate	30,672	'	29,943	'	'	'
Construction:	'	'	'	'	'	'
Total construction	574	'	3,399	'	'	'
PCI- Other [Member] | Home equity lines of credit [Member]	'	'	'	'	'	'
Consumer:	'	'	'	'	'	'
Total consumer loans	4,017	'	5,954	'	'	'
PCI- Other [Member] | Home equity loans [Member]	'	'	'	'	'	'
Consumer:	'	'	'	'	'	'
Total consumer loans	555	'	155	'	'	'
PCI- Other [Member] | Residential [Member]	'	'	'	'	'	'
Construction:	'	'	'	'	'	'
Total construction	$1,232	'	$6,582	'	'	'

Loans_Change_in_Accretable_Yie

Loans - Change in Accretable Yield for PCI (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Change in accretable yield:	'	'	'	'
Balance at beginning of period	$19,727	$23,732	$22,337	$25,145
Accretion to interest income	-1,656	-2,037	-4,847	-5,921
Reclassification from nonaccretable difference	1,850	2,385	2,431	4,857
Balance at end of period	$19,921	$24,080	$19,921	$24,080

Allowance_for_Loan_Losses_Summ

Allowance for Loan Losses - Summary of Activity in the Allowance for Loan Losses, and Ending Balance of Loans, Net of Unearned Fees for the Periods Indicated (Detail) (USD $)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'	'	'
Beginning balance	$39,599,000	$45,849,000	$42,648,000	$45,914,000	$45,914,000
Charge-offs	-985,000	-3,368,000	-5,703,000	-12,478,000	-16,484,000
Recoveries	1,119,000	1,133,000	3,282,000	2,811,000	3,795,000
(Benefit) provision	-393,000	532,000	-887,000	7,899,000	9,423,000
Ending balance	39,340,000	44,146,000	39,340,000	44,146,000	42,648,000
Ending balance:	'	'	'	'	'
Individ. evaluated for impairment	4,458,000	5,759,000	4,458,000	5,759,000	4,505,000
Loans pooled for evaluation	30,649,000	33,507,000	30,649,000	33,507,000	33,233,000
Loans acquired with deteriorated credit quality	4,233,000	4,880,000	4,233,000	4,880,000	4,910,000
Total loans	1,657,051,000	1,575,647,000	1,657,051,000	1,575,647,000	1,564,823,000
Individually evaluated for impairment loans, net of unearned fees	91,218,000	108,974,000	91,218,000	108,974,000	101,330,000
Loans pooled for evaluation, net of unearned fees	1,509,053,000	1,390,324,000	1,509,053,000	1,390,324,000	1,393,925,000
Loans acquired with deteriorated credit quality, net of unearned fees	56,780,000	76,349,000	56,780,000	76,349,000	69,568,000
RE Mortgage [Member] | Residential [Member]	'	'	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'	'	'
Beginning balance	3,231,000	3,458,000	3,523,000	2,404,000	2,404,000
Charge-offs	-4,000	-370,000	-46,000	-918,000	-1,558,000
Recoveries	154,000	'	345,000	27,000	147,000
(Benefit) provision	-190,000	492,000	-631,000	2,067,000	2,530,000
Ending balance	3,191,000	3,580,000	3,191,000	3,580,000	3,523,000
Ending balance:	'	'	'	'	'
Individ. evaluated for impairment	623,000	794,000	623,000	794,000	631,000
Loans pooled for evaluation	2,235,000	2,415,000	2,235,000	2,415,000	2,526,000
Loans acquired with deteriorated credit quality	333,000	371,000	333,000	371,000	366,000
Total loans	197,129,000	134,041,000	197,129,000	134,041,000	131,684,000
Individually evaluated for impairment loans, net of unearned fees	7,013,000	9,285,000	7,013,000	9,285,000	6,586,000
Loans pooled for evaluation, net of unearned fees	183,769,000	118,702,000	183,769,000	118,702,000	120,082,000
Loans acquired with deteriorated credit quality, net of unearned fees	6,347,000	6,054,000	6,347,000	6,054,000	5,016,000
RE Mortgage [Member] | Commercial [Member]	'	'	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'	'	'
Beginning balance	8,764,000	9,566,000	8,782,000	13,217,000	13,217,000
Charge-offs	-23,000	-340,000	-1,712,000	-2,008,000	-3,457,000
Recoveries	295,000	181,000	965,000	999,000	1,020,000
(Benefit) provision	704,000	630,000	1,705,000	-2,171,000	-1,998,000
Ending balance	9,740,000	10,037,000	9,740,000	10,037,000	8,782,000
Ending balance:	'	'	'	'	'
Individ. evaluated for impairment	1,446,000	1,234,000	1,446,000	1,234,000	515,000
Loans pooled for evaluation	7,748,000	8,239,000	7,748,000	8,239,000	8,026,000
Loans acquired with deteriorated credit quality	546,000	564,000	546,000	564,000	241,000
Total loans	894,346,000	873,391,000	894,346,000	873,391,000	878,446,000
Individually evaluated for impairment loans, net of unearned fees	69,373,000	68,887,000	69,373,000	68,887,000	71,077,000
Loans pooled for evaluation, net of unearned fees	794,301,000	771,971,000	794,301,000	771,971,000	776,137,000
Loans acquired with deteriorated credit quality, net of unearned fees	30,672,000	32,533,000	30,672,000	32,533,000	31,232,000
Home equity lines of credit [Member]	'	'	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'	'	'
Beginning balance	18,710,000	21,602,000	21,367,000	18,258,000	18,258,000
Charge-offs	-331,000	-1,636,000	-1,843,000	-6,739,000	-8,042,000
Recoveries	304,000	160,000	809,000	307,000	398,000
(Benefit) provision	-871,000	1,176,000	-2,521,000	9,476,000	10,753,000
Ending balance	17,812,000	21,302,000	17,812,000	21,302,000	21,367,000
Ending balance:	'	'	'	'	'
Individ. evaluated for impairment	1,554,000	2,140,000	1,554,000	2,140,000	2,264,000
Loans pooled for evaluation	15,259,000	17,899,000	15,259,000	17,899,000	17,862,000
Loans acquired with deteriorated credit quality	999,000	1,263,000	999,000	1,263,000	1,241,000
Total loans	346,348,000	342,898,000	346,348,000	342,898,000	342,025,000
Individually evaluated for impairment loans, net of unearned fees	7,664,000	9,946,000	7,664,000	9,946,000	10,056,000
Loans pooled for evaluation, net of unearned fees	328,215,000	318,987,000	328,215,000	318,987,000	318,403,000
Loans acquired with deteriorated credit quality, net of unearned fees	10,469,000	13,965,000	10,469,000	13,965,000	13,566,000
Home equity loans [Member]	'	'	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'	'	'
Beginning balance	1,109,000	1,159,000	1,155,000	1,101,000	1,101,000
Charge-offs	-30,000	-12,000	-56,000	-170,000	-385,000
Recoveries	3,000	6,000	29,000	15,000	100,000
(Benefit) provision	-50,000	100,000	-96,000	307,000	339,000
Ending balance	1,032,000	1,253,000	1,032,000	1,253,000	1,155,000
Ending balance:	'	'	'	'	'
Individ. evaluated for impairment	49,000	174,000	49,000	174,000	81,000
Loans pooled for evaluation	983,000	999,000	983,000	999,000	995,000
Loans acquired with deteriorated credit quality	'	79,000	'	79,000	79,000
Total loans	13,730,000	14,270,000	13,730,000	14,270,000	13,557,000
Individually evaluated for impairment loans, net of unearned fees	551,000	683,000	551,000	683,000	528,000
Loans pooled for evaluation, net of unearned fees	12,575,000	13,383,000	12,575,000	13,383,000	12,825,000
Loans acquired with deteriorated credit quality, net of unearned fees	604,000	204,000	604,000	204,000	204,000
Auto Indirect [Member]	'	'	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'	'	'
Beginning balance	114,000	433,000	243,000	215,000	215,000
Charge-offs	-9,000	-12,000	-67,000	-83,000	-83,000
Recoveries	34,000	72,000	180,000	171,000	215,000
(Benefit) provision	-58,000	-161,000	-275,000	29,000	-104,000
Ending balance	81,000	332,000	81,000	332,000	243,000
Ending balance:	'	'	'	'	'
Individ. evaluated for impairment	2,000	9,000	2,000	9,000	5,000
Loans pooled for evaluation	79,000	324,000	79,000	324,000	238,000
Loans acquired with deteriorated credit quality	'	'	'	'	'
Total loans	1,351,000	5,067,000	1,351,000	5,067,000	3,816,000
Individually evaluated for impairment loans, net of unearned fees	66,000	260,000	66,000	260,000	197,000
Loans pooled for evaluation, net of unearned fees	1,285,000	4,807,000	1,285,000	4,807,000	3,619,000
Loans acquired with deteriorated credit quality, net of unearned fees	'	'	'	'	'
Other Consumer [Member]	'	'	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'	'	'
Beginning balance	567,000	621,000	696,000	932,000	932,000
Charge-offs	-239,000	-280,000	-724,000	-928,000	-1,202,000
Recoveries	199,000	211,000	601,000	653,000	860,000
(Benefit) provision	7,000	132,000	-39,000	27,000	106,000
Ending balance	534,000	684,000	534,000	684,000	696,000
Ending balance:	'	'	'	'	'
Individ. evaluated for impairment	6,000	45,000	6,000	45,000	47,000
Loans pooled for evaluation	521,000	640,000	521,000	640,000	649,000
Loans acquired with deteriorated credit quality	7,000	'	7,000	'	'
Total loans	28,282,000	26,609,000	28,282,000	26,609,000	26,713,000
Individually evaluated for impairment loans, net of unearned fees	94,000	136,000	94,000	136,000	121,000
Loans pooled for evaluation, net of unearned fees	28,113,000	26,450,000	28,113,000	26,450,000	26,560,000
Loans acquired with deteriorated credit quality, net of unearned fees	75,000	23,000	75,000	23,000	32,000
C&I [Member]	'	'	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'	'	'
Beginning balance	4,929,000	5,694,000	4,703,000	6,545,000	6,545,000
Charge-offs	-318,000	-625,000	-1,143,000	-1,202,000	-1,251,000
Recoveries	108,000	91,000	244,000	227,000	643,000
(Benefit) provision	-234,000	-389,000	681,000	-799,000	-1,234,000
Ending balance	4,485,000	4,771,000	4,485,000	4,771,000	4,703,000
Ending balance:	'	'	'	'	'
Individ. evaluated for impairment	678,000	773,000	678,000	773,000	840,000
Loans pooled for evaluation	2,450,000	2,445,000	2,450,000	2,445,000	2,342,000
Loans acquired with deteriorated credit quality	1,358,000	1,553,000	1,358,000	1,553,000	1,521,000
Total loans	133,616,000	145,469,000	133,616,000	145,469,000	135,528,000
Individually evaluated for impairment loans, net of unearned fees	3,333,000	8,696,000	3,333,000	8,696,000	8,562,000
Loans pooled for evaluation, net of unearned fees	123,476,000	124,487,000	123,476,000	124,487,000	117,429,000
Loans acquired with deteriorated credit quality, net of unearned fees	6,807,000	12,286,000	6,807,000	12,286,000	9,537,000
Construction [Member] | Residential [Member]	'	'	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'	'	'
Beginning balance	1,288,000	1,679,000	1,400,000	1,817,000	1,817,000
Charge-offs	'	'	-20,000	-362,000	-406,000
Recoveries	2,000	412,000	63,000	412,000	412,000
(Benefit) provision	157,000	-802,000	4,000	-578,000	-423,000
Ending balance	1,447,000	1,289,000	1,447,000	1,289,000	1,400,000
Ending balance:	'	'	'	'	'
Individ. evaluated for impairment	91,000	40,000	91,000	40,000	11,000
Loans pooled for evaluation	723,000	465,000	723,000	465,000	430,000
Loans acquired with deteriorated credit quality	633,000	783,000	633,000	783,000	959,000
Total loans	27,601,000	18,332,000	27,601,000	18,332,000	18,459,000
Individually evaluated for impairment loans, net of unearned fees	2,872,000	4,126,000	2,872,000	4,126,000	3,596,000
Loans pooled for evaluation, net of unearned fees	23,497,000	6,448,000	23,497,000	6,448,000	8,281,000
Loans acquired with deteriorated credit quality, net of unearned fees	1,232,000	7,758,000	1,232,000	7,758,000	6,582,000
Construction [Member] | Commercial [Member]	'	'	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'	'	'
Beginning balance	887,000	1,637,000	779,000	1,425,000	1,425,000
Charge-offs	-31,000	-93,000	-92,000	-68,000	-100,000
Recoveries	20,000	'	46,000	'	'
(Benefit) provision	142,000	-646,000	285,000	-459,000	-546,000
Ending balance	1,018,000	898,000	1,018,000	898,000	779,000
Ending balance:	'	'	'	'	'
Individ. evaluated for impairment	9,000	550,000	9,000	550,000	111,000
Loans pooled for evaluation	653,000	81,000	653,000	81,000	165,000
Loans acquired with deteriorated credit quality	356,000	267,000	356,000	267,000	503,000
Total loans	14,648,000	15,570,000	14,648,000	15,570,000	14,595,000
Individually evaluated for impairment loans, net of unearned fees	252,000	6,955,000	252,000	6,955,000	607,000
Loans pooled for evaluation, net of unearned fees	13,822,000	5,089,000	13,822,000	5,089,000	10,589,000
Loans acquired with deteriorated credit quality, net of unearned fees	$574,000	$3,526,000	$574,000	$3,526,000	$3,399,000

Allowance_for_Loan_Losses_Pres

Allowance for Loan Losses - Presentation of Credit Quality Indicators (Detail) (USD $)	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2012
In Thousands, unless otherwise specified
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total loans	$1,657,051	$1,564,823	$1,575,647
Originated loans [Member]	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total loans	1,458,835	1,397,335	'
PNCI loans [Member]	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total loans	141,436	97,920	'
PCI loans [Member]	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total loans	56,780	69,568	'
Pass [Member] | Originated loans [Member]	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total loans	1,356,854	1,256,795	'
Pass [Member] | PNCI loans [Member]	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total loans	132,805	89,230	'
Special mention [Member] | Originated loans [Member]	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total loans	26,620	37,170	'
Special mention [Member] | PNCI loans [Member]	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total loans	3,586	5,567	'
Substandard [Member] | Originated loans [Member]	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total loans	75,361	103,370	'
Substandard [Member] | PNCI loans [Member]	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total loans	5,045	3,114	'
Loss [Member] | PNCI loans [Member]	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total loans	'	9	'
RE Mortgage [Member] | Residential [Member]	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total loans	197,129	131,684	134,041
RE Mortgage [Member] | Residential [Member] | Originated loans [Member]	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total loans	128,974	121,255	'
RE Mortgage [Member] | Residential [Member] | PNCI loans [Member]	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total loans	61,808	5,413	'
RE Mortgage [Member] | Residential [Member] | PCI loans [Member]	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total loans	6,347	5,016	'
RE Mortgage [Member] | Commercial [Member]	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total loans	894,346	878,446	873,391
RE Mortgage [Member] | Commercial [Member] | Originated loans [Member]	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total loans	801,570	775,124	'
RE Mortgage [Member] | Commercial [Member] | PNCI loans [Member]	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total loans	62,104	72,090	'
RE Mortgage [Member] | Commercial [Member] | PCI loans [Member]	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total loans	30,672	31,232	'
RE Mortgage [Member] | Pass [Member] | Residential [Member] | Originated loans [Member]	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total loans	120,824	108,946	'
RE Mortgage [Member] | Pass [Member] | Residential [Member] | PNCI loans [Member]	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total loans	61,123	4,968	'
RE Mortgage [Member] | Pass [Member] | Commercial [Member] | Originated loans [Member]	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total loans	731,319	686,593	'
RE Mortgage [Member] | Pass [Member] | Commercial [Member] | PNCI loans [Member]	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total loans	55,446	64,917	'
RE Mortgage [Member] | Special mention [Member] | Residential [Member] | Originated loans [Member]	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total loans	968	3,122	'
RE Mortgage [Member] | Special mention [Member] | Residential [Member] | PNCI loans [Member]	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total loans	'	'	'
RE Mortgage [Member] | Special mention [Member] | Commercial [Member] | Originated loans [Member]	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total loans	20,660	21,184	'
RE Mortgage [Member] | Special mention [Member] | Commercial [Member] | PNCI loans [Member]	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total loans	3,060	5,249	'
RE Mortgage [Member] | Substandard [Member] | Residential [Member] | Originated loans [Member]	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total loans	7,182	9,187	'
RE Mortgage [Member] | Substandard [Member] | Residential [Member] | PNCI loans [Member]	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total loans	685	436	'
RE Mortgage [Member] | Substandard [Member] | Commercial [Member] | Originated loans [Member]	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total loans	49,591	67,347	'
RE Mortgage [Member] | Substandard [Member] | Commercial [Member] | PNCI loans [Member]	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total loans	3,598	1,924	'
RE Mortgage [Member] | Loss [Member] | Residential [Member] | PNCI loans [Member]	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total loans	'	9	'
Home equity lines of credit [Member]	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total loans	346,348	342,025	342,898
Home equity lines of credit [Member] | Originated loans [Member]	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total loans	321,512	311,671	'
Home equity lines of credit [Member] | PNCI loans [Member]	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total loans	14,367	16,788	'
Home equity lines of credit [Member] | PCI loans [Member]	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total loans	10,469	13,566	'
Home equity lines of credit [Member] | Pass [Member] | Originated loans [Member]	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total loans	308,997	291,701	'
Home equity lines of credit [Member] | Pass [Member] | PNCI loans [Member]	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total loans	13,466	15,915	'
Home equity lines of credit [Member] | Special mention [Member] | Originated loans [Member]	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total loans	2,731	6,955	'
Home equity lines of credit [Member] | Special mention [Member] | PNCI loans [Member]	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total loans	177	193	'
Home equity lines of credit [Member] | Substandard [Member] | Originated loans [Member]	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total loans	9,784	13,015	'
Home equity lines of credit [Member] | Substandard [Member] | PNCI loans [Member]	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total loans	724	680	'
Home equity loans [Member]	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total loans	13,730	13,557	14,270
Home equity loans [Member] | Originated loans [Member]	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total loans	12,845	13,011	'
Home equity loans [Member] | PNCI loans [Member]	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total loans	281	342	'
Home equity loans [Member] | PCI loans [Member]	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total loans	604	204	'
Home equity loans [Member] | Pass [Member] | Originated loans [Member]	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total loans	11,827	11,892	'
Home equity loans [Member] | Pass [Member] | PNCI loans [Member]	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total loans	281	342	'
Home equity loans [Member] | Special mention [Member] | Originated loans [Member]	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total loans	217	555	'
Home equity loans [Member] | Special mention [Member] | PNCI loans [Member]	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total loans	'	'	'
Home equity loans [Member] | Substandard [Member] | Originated loans [Member]	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total loans	801	564	'
Home equity loans [Member] | Substandard [Member] | PNCI loans [Member]	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total loans	'	'	'
Auto Indirect [Member]	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total loans	1,351	3,816	5,067
Auto Indirect [Member] | Originated loans [Member]	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total loans	1,351	3,816	'
Auto Indirect [Member] | PNCI loans [Member]	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total loans	'	'	'
Auto Indirect [Member] | PCI loans [Member]	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total loans	'	'	'
Auto Indirect [Member] | Pass [Member] | Originated loans [Member]	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total loans	1,051	2,949	'
Auto Indirect [Member] | Pass [Member] | PNCI loans [Member]	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total loans	'	'	'
Auto Indirect [Member] | Special mention [Member] | Originated loans [Member]	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total loans	157	531	'
Auto Indirect [Member] | Special mention [Member] | PNCI loans [Member]	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total loans	'	'	'
Auto Indirect [Member] | Substandard [Member] | Originated loans [Member]	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total loans	143	336	'
Auto Indirect [Member] | Substandard [Member] | PNCI loans [Member]	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total loans	'	'	'
Other Consumer [Member]	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total loans	28,282	26,713	26,609
Other Consumer [Member] | Originated loans [Member]	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total loans	26,106	24,263	'
Other Consumer [Member] | PNCI loans [Member]	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total loans	2,101	2,418	'
Other Consumer [Member] | PCI loans [Member]	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total loans	75	32	'
Other Consumer [Member] | Pass [Member] | Originated loans [Member]	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total loans	25,462	23,154	'
Other Consumer [Member] | Pass [Member] | PNCI loans [Member]	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total loans	2,039	2,240	'
Other Consumer [Member] | Special mention [Member] | Originated loans [Member]	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total loans	529	958	'
Other Consumer [Member] | Special mention [Member] | PNCI loans [Member]	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total loans	24	104	'
Other Consumer [Member] | Substandard [Member] | Originated loans [Member]	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total loans	115	151	'
Other Consumer [Member] | Substandard [Member] | PNCI loans [Member]	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total loans	38	74	'
C&I [Member]	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total loans	133,616	135,528	145,469
C&I [Member] | Originated loans [Member]	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total loans	126,034	125,122	'
C&I [Member] | PNCI loans [Member]	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total loans	775	869	'
C&I [Member] | PCI loans [Member]	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total loans	6,807	9,537	'
C&I [Member] | Pass [Member] | Originated loans [Member]	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total loans	121,901	113,595	'
C&I [Member] | Pass [Member] | PNCI loans [Member]	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total loans	450	848	'
C&I [Member] | Special mention [Member] | Originated loans [Member]	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total loans	740	3,224	'
C&I [Member] | Special mention [Member] | PNCI loans [Member]	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total loans	325	21	'
C&I [Member] | Substandard [Member] | Originated loans [Member]	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total loans	3,393	8,303	'
C&I [Member] | Substandard [Member] | PNCI loans [Member]	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total loans	'	'	'
Construction [Member] | Residential [Member]	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total loans	27,601	18,459	18,332
Construction [Member] | Residential [Member] | Originated loans [Member]	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total loans	26,369	11,877	'
Construction [Member] | Residential [Member] | PNCI loans [Member]	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total loans	'	'	'
Construction [Member] | Residential [Member] | PCI loans [Member]	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total loans	1,232	6,582	'
Construction [Member] | Commercial [Member]	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total loans	14,648	14,595	15,570
Construction [Member] | Commercial [Member] | Originated loans [Member]	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total loans	14,074	11,196	'
Construction [Member] | Commercial [Member] | PNCI loans [Member]	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total loans	'	'	'
Construction [Member] | Commercial [Member] | PCI loans [Member]	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total loans	574	3,399	'
Construction [Member] | Pass [Member] | Residential [Member] | Originated loans [Member]	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total loans	22,205	7,744	'
Construction [Member] | Pass [Member] | Residential [Member] | PNCI loans [Member]	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total loans	'	'	'
Construction [Member] | Pass [Member] | Commercial [Member] | Originated loans [Member]	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total loans	13,268	10,221	'
Construction [Member] | Pass [Member] | Commercial [Member] | PNCI loans [Member]	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total loans	'	'	'
Construction [Member] | Special mention [Member] | Residential [Member] | Originated loans [Member]	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total loans	98	285	'
Construction [Member] | Special mention [Member] | Residential [Member] | PNCI loans [Member]	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total loans	'	'	'
Construction [Member] | Special mention [Member] | Commercial [Member] | Originated loans [Member]	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total loans	520	356	'
Construction [Member] | Special mention [Member] | Commercial [Member] | PNCI loans [Member]	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total loans	'	'	'
Construction [Member] | Substandard [Member] | Residential [Member] | Originated loans [Member]	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total loans	4,066	3,848	'
Construction [Member] | Substandard [Member] | Residential [Member] | PNCI loans [Member]	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total loans	'	'	'
Construction [Member] | Substandard [Member] | Commercial [Member] | Originated loans [Member]	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total loans	286	619	'
Construction [Member] | Substandard [Member] | Commercial [Member] | PNCI loans [Member]	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total loans	'	'	'

Allowance_for_Loan_Losses_Addi

Allowance for Loan Losses - Additional Information (Detail) (USD $)	9 Months Ended						9 Months Ended
	Sep. 30, 2013	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2013	Sep. 30, 2013	Sep. 30, 2013
	Category	Originated loans [Member]	Originated loans [Member]	PNCI loans [Member]	PNCI loans [Member]	PCI loans [Member]	Minimum [Member]	Maximum [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'	'	'	'	'	'
Period of collateral payment of loan	'	'	'	'	'	'	'3 months	'12 months
Number of categories occupied under commercial real estate loans	2	'	'	'	'	'	'	'
Impaired TDR Loans	'	$54,551,000	$57,223,000	$928,000	$950,000	$87,000	'	'
Additional funds in TDR	'	50,000	137,000	'	'	'	'	'
Obligations to lend additional funds on TDR	'	'	'	$0	$0	'	'	'

Allowance_for_Loan_Losses_Anal

Allowance for Loan Losses - Analysis of Past Due and Nonaccrual Loans (Detail) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Originated loans [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
30-59 Days	$9,426	$10,136
60-89 Days	6,358	2,926
> 90 Days	9,933	23,126
Total past due	25,717	36,188
Current	1,433,118	1,361,147
Total Originated loans	1,458,835	1,397,335
> 90 Days and still accruing	'	'
Nonaccrual loans	53,261	61,769
PNCI loans [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
30-59 Days	514	1,679
60-89 Days	1,921	63
> 90 Days	10	348
Total past due	2,445	2,090
Current	138,991	95,830
Total Originated loans	141,436	97,920
> 90 Days and still accruing	'	'
Nonaccrual loans	1,597	1,776
RE Mortgage [Member] | Residential [Member] | Originated loans [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
30-59 Days	184	1,702
60-89 Days	1,023	278
> 90 Days	176	674
Total past due	1,383	2,654
Current	127,591	118,601
Total Originated loans	128,974	121,255
> 90 Days and still accruing	'	'
Nonaccrual loans	4,353	4,781
RE Mortgage [Member] | Residential [Member] | PNCI loans [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
30-59 Days	'	1,024
60-89 Days	'	'
> 90 Days	'	43
Total past due	'	1,067
Current	61,808	4,346
Total Originated loans	61,808	5,413
> 90 Days and still accruing	'	'
Nonaccrual loans	265	113
RE Mortgage [Member] | Commercial [Member] | Originated loans [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
30-59 Days	5,323	2,695
60-89 Days	2,887	1,578
> 90 Days	7,234	13,829
Total past due	15,444	18,102
Current	786,126	757,022
Total Originated loans	801,570	775,124
> 90 Days and still accruing	'	'
Nonaccrual loans	38,241	37,220
RE Mortgage [Member] | Commercial [Member] | PNCI loans [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
30-59 Days	514	500
60-89 Days	1,883	'
> 90 Days	10	148
Total past due	2,407	648
Current	59,697	71,442
Total Originated loans	62,104	72,090
> 90 Days and still accruing	'	'
Nonaccrual loans	800	1,218
Home equity lines of credit [Member] | Originated loans [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
30-59 Days	3,258	3,371
60-89 Days	987	819
> 90 Days	2,007	3,395
Total past due	6,252	7,585
Current	315,260	304,086
Total Originated loans	321,512	311,671
> 90 Days and still accruing	'	'
Nonaccrual loans	6,098	8,486
Home equity lines of credit [Member] | PNCI loans [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
30-59 Days	'	124
60-89 Days	38	63
> 90 Days	'	157
Total past due	38	344
Current	14,329	16,444
Total Originated loans	14,367	16,788
> 90 Days and still accruing	'	'
Nonaccrual loans	494	403
Home equity loans [Member] | Originated loans [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
30-59 Days	67	67
60-89 Days	90	33
> 90 Days	254	217
Total past due	411	317
Current	12,434	12,694
Total Originated loans	12,845	13,011
> 90 Days and still accruing	'	'
Nonaccrual loans	490	465
Home equity loans [Member] | PNCI loans [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
30-59 Days	'	'
60-89 Days	'	'
> 90 Days	'	'
Total past due	'	'
Current	281	342
Total Originated loans	281	342
> 90 Days and still accruing	'	'
Nonaccrual loans	'	'
Auto Indirect [Member] | Originated loans [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
30-59 Days	38	77
60-89 Days	'	40
> 90 Days	40	79
Total past due	78	196
Current	1,273	3,620
Total Originated loans	1,351	3,816
> 90 Days and still accruing	'	'
Nonaccrual loans	59	174
Other Consumer [Member] | Originated loans [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
30-59 Days	28	67
60-89 Days	2	40
> 90 Days	10	14
Total past due	40	121
Current	26,066	24,142
Total Originated loans	26,106	24,263
> 90 Days and still accruing	'	'
Nonaccrual loans	28	49
Other Consumer [Member] | PNCI loans [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
30-59 Days	'	31
60-89 Days	'	'
> 90 Days	'	'
Total past due	'	31
Current	2,101	2,387
Total Originated loans	2,101	2,418
> 90 Days and still accruing	'	'
Nonaccrual loans	38	42
C&I [Member] | Originated loans [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
30-59 Days	372	1,848
60-89 Days	939	138
> 90 Days	125	4,782
Total past due	1,436	6,768
Current	124,598	118,354
Total Originated loans	126,034	125,122
> 90 Days and still accruing	'	'
Nonaccrual loans	1,152	6,750
C&I [Member] | PNCI loans [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
30-59 Days	'	'
60-89 Days	'	'
> 90 Days	'	'
Total past due	'	'
Current	775	869
Total Originated loans	775	869
> 90 Days and still accruing	'	'
Nonaccrual loans	'	'
Construction [Member] | Residential [Member] | Originated loans [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
30-59 Days	107	309
60-89 Days	232	'
> 90 Days	19	42
Total past due	358	351
Current	26,011	11,526
Total Originated loans	26,369	11,877
> 90 Days and still accruing	'	'
Nonaccrual loans	2,588	3,312
Construction [Member] | Commercial [Member] | Originated loans [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
30-59 Days	49	'
60-89 Days	198	'
> 90 Days	68	94
Total past due	315	94
Current	13,759	11,102
Total Originated loans	14,074	11,196
> 90 Days and still accruing	'	'
Nonaccrual loans	$252	$532

Allowance_for_Loan_Losses_Impa

Allowance for Loan Losses - Impaired Loans (Detail) (USD $)	9 Months Ended		12 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Originated loans [Member]	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Recorded investment, with no related allowance recorded	$73,890	$80,569	$82,411
Unpaid principal, with no related allowance recorded	90,972	101,922	97,205
Average recorded investment, with no related allowance recorded	75,159	84,963	84,095
Interest income recognized, with no related allowance recorded	3,334	1,332	2,749
Recorded investment, with an allowance recorded	15,439	24,148	16,457
Unpaid principal, with an allowance recorded	17,834	27,922	20,127
Related allowance, with an allowance recorded	3,955	5,241	4,252
Average recorded investment, with an allowance recorded	15,950	23,957	29,443
Interest income recognized, with an allowance recorded	784	652	428
PNCI loans [Member]	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Recorded investment, with no related allowance recorded	1,142	3,089	1,833
Unpaid principal, with no related allowance recorded	3,295	5,151	4,038
Average recorded investment, with no related allowance recorded	1,489	2,479	2,474
Interest income recognized, with no related allowance recorded	177	141	138
Recorded investment, with an allowance recorded	747	1,168	629
Unpaid principal, with an allowance recorded	773	1,188	673
Related allowance, with an allowance recorded	515	518	253
Average recorded investment, with an allowance recorded	729	401	525
Interest income recognized, with an allowance recorded	35	38	24
RE Mortgage [Member] | Residential [Member] | Originated loans [Member]	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Recorded investment, with no related allowance recorded	4,195	5,971	3,520
Unpaid principal, with no related allowance recorded	6,320	8,638	5,349
Average recorded investment, with no related allowance recorded	3,911	6,857	6,329
Interest income recognized, with no related allowance recorded	246	41	71
Recorded investment, with an allowance recorded	2,468	2,895	2,867
Unpaid principal, with an allowance recorded	2,510	3,401	3,432
Related allowance, with an allowance recorded	480	610	603
Average recorded investment, with an allowance recorded	2,304	2,934	3,890
Interest income recognized, with an allowance recorded	93	77	67
RE Mortgage [Member] | Residential [Member] | PNCI loans [Member]	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Recorded investment, with no related allowance recorded	'	63	'
Unpaid principal, with no related allowance recorded	'	63	'
Average recorded investment, with no related allowance recorded	'	11	16
Interest income recognized, with no related allowance recorded	'	3	'
Recorded investment, with an allowance recorded	350	356	199
Unpaid principal, with an allowance recorded	366	359	225
Related allowance, with an allowance recorded	193	184	28
Average recorded investment, with an allowance recorded	276	192	213
Interest income recognized, with an allowance recorded	18	10	9
RE Mortgage [Member] | Commercial [Member] | Originated loans [Member]	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Recorded investment, with no related allowance recorded	61,418	58,397	66,031
Unpaid principal, with no related allowance recorded	67,314	67,181	70,709
Average recorded investment, with no related allowance recorded	61,375	60,994	61,299
Interest income recognized, with no related allowance recorded	2,644	1,178	2,513
Recorded investment, with an allowance recorded	6,990	7,428	3,258
Unpaid principal, with an allowance recorded	7,670	8,482	3,556
Related allowance, with an allowance recorded	1,293	1,068	352
Average recorded investment, with an allowance recorded	5,568	6,755	7,841
Interest income recognized, with an allowance recorded	388	145	129
RE Mortgage [Member] | Commercial [Member] | PNCI loans [Member]	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Recorded investment, with no related allowance recorded	800	2,739	1,468
Unpaid principal, with no related allowance recorded	2,893	4,769	3,452
Average recorded investment, with no related allowance recorded	1,088	2,095	2,097
Interest income recognized, with no related allowance recorded	154	130	133
Recorded investment, with an allowance recorded	165	323	320
Unpaid principal, with an allowance recorded	165	334	331
Related allowance, with an allowance recorded	133	165	163
Average recorded investment, with an allowance recorded	292	54	121
Interest income recognized, with an allowance recorded	7	10	12
Home equity lines of credit [Member] | Originated loans [Member]	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Recorded investment, with no related allowance recorded	3,938	4,262	4,241
Unpaid principal, with no related allowance recorded	7,445	7,183	6,691
Average recorded investment, with no related allowance recorded	4,543	4,331	4,311
Interest income recognized, with no related allowance recorded	268	36	58
Recorded investment, with an allowance recorded	3,232	4,981	5,412
Unpaid principal, with an allowance recorded	3,703	6,712	7,103
Related allowance, with an allowance recorded	1,350	2,009	2,237
Average recorded investment, with an allowance recorded	3,722	4,527	6,331
Interest income recognized, with an allowance recorded	109	61	103
Home equity lines of credit [Member] | PNCI loans [Member]	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Recorded investment, with no related allowance recorded	290	287	365
Unpaid principal, with no related allowance recorded	342	319	586
Average recorded investment, with no related allowance recorded	367	302	308
Interest income recognized, with no related allowance recorded	19	8	5
Recorded investment, with an allowance recorded	204	416	38
Unpaid principal, with an allowance recorded	214	418	41
Related allowance, with an allowance recorded	179	132	27
Average recorded investment, with an allowance recorded	121	122	148
Interest income recognized, with an allowance recorded	9	17	1
Home equity loans [Member] | Originated loans [Member]	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Recorded investment, with no related allowance recorded	442	390	361
Unpaid principal, with no related allowance recorded	1,131	866	781
Average recorded investment, with no related allowance recorded	415	314	329
Interest income recognized, with no related allowance recorded	21	4	1
Recorded investment, with an allowance recorded	109	293	167
Unpaid principal, with an allowance recorded	161	555	396
Related allowance, with an allowance recorded	49	174	81
Average recorded investment, with an allowance recorded	126	261	317
Interest income recognized, with an allowance recorded	8	6	16
Home equity loans [Member] | PNCI loans [Member]	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Recorded investment, with no related allowance recorded	'	'	'
Unpaid principal, with no related allowance recorded	'	'	'
Average recorded investment, with no related allowance recorded	'	15	11
Interest income recognized, with no related allowance recorded	'	'	'
Recorded investment, with an allowance recorded	'	'	'
Unpaid principal, with an allowance recorded	'	'	'
Related allowance, with an allowance recorded	'	'	'
Average recorded investment, with an allowance recorded	'	'	'
Interest income recognized, with an allowance recorded	'	'	'
Auto Indirect [Member] | Originated loans [Member]	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Recorded investment, with no related allowance recorded	61	207	163
Unpaid principal, with no related allowance recorded	135	375	311
Average recorded investment, with no related allowance recorded	120	289	263
Interest income recognized, with no related allowance recorded	10	3	3
Recorded investment, with an allowance recorded	5	53	34
Unpaid principal, with an allowance recorded	7	74	51
Related allowance, with an allowance recorded	2	9	5
Average recorded investment, with an allowance recorded	19	90	102
Interest income recognized, with an allowance recorded	'	1	1
Other Consumer [Member] | Originated loans [Member]	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Recorded investment, with no related allowance recorded	19	32	19
Unpaid principal, with no related allowance recorded	32	52	40
Average recorded investment, with no related allowance recorded	19	47	42
Interest income recognized, with no related allowance recorded	2	'	'
Recorded investment, with an allowance recorded	9	31	30
Unpaid principal, with an allowance recorded	10	33	32
Related allowance, with an allowance recorded	3	8	12
Average recorded investment, with an allowance recorded	12	39	49
Interest income recognized, with an allowance recorded	1	'	1
Other Consumer [Member] | PNCI loans [Member]	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Recorded investment, with no related allowance recorded	38	'	'
Unpaid principal, with no related allowance recorded	46	'	'
Average recorded investment, with no related allowance recorded	30	41	31
Interest income recognized, with no related allowance recorded	4	'	'
Recorded investment, with an allowance recorded	28	73	72
Unpaid principal, with an allowance recorded	28	77	76
Related allowance, with an allowance recorded	10	37	35
Average recorded investment, with an allowance recorded	40	33	43
Interest income recognized, with an allowance recorded	1	1	2
C&I [Member] | Originated loans [Member]	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Recorded investment, with no related allowance recorded	1,161	6,907	4,238
Unpaid principal, with no related allowance recorded	1,182	7,753	4,613
Average recorded investment, with no related allowance recorded	2,802	8,143	7,500
Interest income recognized, with no related allowance recorded	61	43	73
Recorded investment, with an allowance recorded	2,158	1,789	4,324
Unpaid principal, with an allowance recorded	3,063	1,826	4,992
Related allowance, with an allowance recorded	678	773	840
Average recorded investment, with an allowance recorded	2,519	1,359	2,800
Interest income recognized, with an allowance recorded	155	72	100
C&I [Member] | PNCI loans [Member]	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Recorded investment, with no related allowance recorded	14	'	'
Unpaid principal, with no related allowance recorded	14	'	'
Average recorded investment, with no related allowance recorded	4	15	11
Interest income recognized, with no related allowance recorded	'	'	'
Recorded investment, with an allowance recorded	'	'	'
Unpaid principal, with an allowance recorded	'	'	'
Related allowance, with an allowance recorded	'	'	'
Average recorded investment, with an allowance recorded	'	'	'
Interest income recognized, with an allowance recorded	'	'	'
Construction [Member] | Residential [Member] | Originated loans [Member]	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Recorded investment, with no related allowance recorded	2,588	3,879	3,554
Unpaid principal, with no related allowance recorded	7,345	9,010	8,227
Average recorded investment, with no related allowance recorded	1,837	3,434	3,505
Interest income recognized, with no related allowance recorded	81	19	20
Recorded investment, with an allowance recorded	284	247	42
Unpaid principal, with an allowance recorded	284	295	42
Related allowance, with an allowance recorded	91	40	11
Average recorded investment, with an allowance recorded	1,438	1,529	1,543
Interest income recognized, with an allowance recorded	14	3	6
Construction [Member] | Commercial [Member] | Originated loans [Member]	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Recorded investment, with no related allowance recorded	68	524	284
Unpaid principal, with no related allowance recorded	68	864	484
Average recorded investment, with no related allowance recorded	137	554	517
Interest income recognized, with no related allowance recorded	1	8	10
Recorded investment, with an allowance recorded	184	6,431	323
Unpaid principal, with an allowance recorded	426	6,544	523
Related allowance, with an allowance recorded	9	550	111
Average recorded investment, with an allowance recorded	242	6,463	6,570
Interest income recognized, with an allowance recorded	$16	$287	$5

Allowance_for_Loan_Losses_Trou

Allowance for Loan Losses - Troubled Debt Restructurings (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
	SecurityLoan	SecurityLoan	SecurityLoan	SecurityLoan
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'	'
Number	13	10	30	35
Pre-modification out-standing principal balance	$1,225	$1,191	$6,902	$6,293
Post-modification out-standing principal balance	1,229	1,206	6,915	6,359
Financial impact due to troubled debt restructure taken as additional provision	61	312	485	419
Number that defaulted during the period	5	5	15	19
Recorded investment of TDRs that defaulted during the period	774	1,011	3,256	6,381
Financial impact due to the default of previous troubled debt restructure taken as charge-offs or additional provisions	7	'	9	36
RE Mortgage [Member] | Residential [Member]	'	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'	'
Number	4	1	6	4
Pre-modification out-standing principal balance	607	101	1,039	822
Post-modification out-standing principal balance	607	101	1,043	842
Financial impact due to troubled debt restructure taken as additional provision	'	'	151	-11
Number that defaulted during the period	'	'	2	1
Recorded investment of TDRs that defaulted during the period	'	'	181	112
Financial impact due to the default of previous troubled debt restructure taken as charge-offs or additional provisions	'	'	-3	'
RE Mortgage [Member] | Commercial [Member]	'	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'	'
Number	1	4	7	14
Pre-modification out-standing principal balance	25	609	4,580	3,220
Post-modification out-standing principal balance	26	609	4,581	3,182
Financial impact due to troubled debt restructure taken as additional provision	4	154	26	212
Number that defaulted during the period	3	1	7	8
Recorded investment of TDRs that defaulted during the period	674	625	1,065	4,303
Financial impact due to the default of previous troubled debt restructure taken as charge-offs or additional provisions	'	'	'	'
Home equity lines of credit [Member]	'	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'	'
Number	3	2	10	10
Pre-modification out-standing principal balance	480	146	1,062	1,398
Post-modification out-standing principal balance	482	150	1,069	1,471
Financial impact due to troubled debt restructure taken as additional provision	27	'	220	60
Number that defaulted during the period	2	2	2	3
Recorded investment of TDRs that defaulted during the period	100	169	100	443
Financial impact due to the default of previous troubled debt restructure taken as charge-offs or additional provisions	7	'	7	-13
Home equity loans [Member]	'	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'	'
Number	'	'	'	'
Pre-modification out-standing principal balance	'	'	'	'
Post-modification out-standing principal balance	'	'	'	'
Financial impact due to troubled debt restructure taken as additional provision	'	'	'	'
Number that defaulted during the period	'	'	'	1
Recorded investment of TDRs that defaulted during the period	'	'	'	46
Financial impact due to the default of previous troubled debt restructure taken as charge-offs or additional provisions	'	'	'	-1
Other Consumer [Member]	'	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'	'
Number	'	'	'	1
Pre-modification out-standing principal balance	'	'	'	38
Post-modification out-standing principal balance	'	'	'	38
Financial impact due to troubled debt restructure taken as additional provision	'	'	'	'
Number that defaulted during the period	'	'	'	'
Recorded investment of TDRs that defaulted during the period	'	'	'	'
Financial impact due to the default of previous troubled debt restructure taken as charge-offs or additional provisions	'	'	'	'
C&I [Member]	'	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'	'
Number	5	2	7	3
Pre-modification out-standing principal balance	113	249	221	498
Post-modification out-standing principal balance	114	249	222	498
Financial impact due to troubled debt restructure taken as additional provision	30	158	88	158
Number that defaulted during the period	'	'	3	2
Recorded investment of TDRs that defaulted during the period	'	'	1,297	1,124
Financial impact due to the default of previous troubled debt restructure taken as charge-offs or additional provisions	'	'	'	50
Construction [Member] | Residential [Member]	'	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'	'
Number	'	1	'	3
Pre-modification out-standing principal balance	'	86	'	317
Post-modification out-standing principal balance	'	97	'	328
Financial impact due to troubled debt restructure taken as additional provision	'	'	'	'
Number that defaulted during the period	'	'	1	1
Recorded investment of TDRs that defaulted during the period	'	'	73	97
Financial impact due to the default of previous troubled debt restructure taken as charge-offs or additional provisions	'	'	5	'
Construction [Member] | Commercial [Member]	'	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'	'
Number	'	'	'	'
Pre-modification out-standing principal balance	'	'	'	'
Post-modification out-standing principal balance	'	'	'	'
Financial impact due to troubled debt restructure taken as additional provision	'	'	'	'
Number that defaulted during the period	'	2	'	3
Recorded investment of TDRs that defaulted during the period	'	217	'	256
Financial impact due to the default of previous troubled debt restructure taken as charge-offs or additional provisions	'	'	'	'

Foreclosed_Assets_Summary_of_t

Foreclosed Assets - Summary of the Activity in the Balance of Foreclosed Assets (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
			Assets	Assets
Schedule Of Assets By Segment [Line Items]	'	'	'	'
Beginning balance, net	'	'	$7,498	$16,332
Additions/transfers from loans	'	'	8,035	6,290
Dispositions/sales	'	'	-10,773	-10,917
Valuation adjustments	'	-433	-620	-1,520
Ending balance, net	4,140	10,185	4,140	10,185
Ending valuation allowance	'	'	-927	-2,231
Ending number of foreclosed assets	'	'	31	50
Proceeds from sale of foreclosed assets	'	'	12,252	11,281
Gain (loss) on sale of foreclosed assets	'	'	1,479	364
Noncovered [Member]	'	'	'	'
Schedule Of Assets By Segment [Line Items]	'	'	'	'
Beginning balance, net	'	'	5,957	13,268
Additions/transfers from loans	'	'	7,542	5,657
Dispositions/sales	'	'	-10,004	-10,073
Valuation adjustments	'	'	-539	-1,059
Ending balance, net	2,956	7,793	2,956	7,793
Ending valuation allowance	'	'	-587	-1,385
Ending number of foreclosed assets	'	'	26	42
Proceeds from sale of foreclosed assets	'	'	11,383	10,271
Gain (loss) on sale of foreclosed assets	'	'	1,379	198
Covered [Member]	'	'	'	'
Schedule Of Assets By Segment [Line Items]	'	'	'	'
Beginning balance, net	'	'	1,541	3,064
Additions/transfers from loans	'	'	493	633
Dispositions/sales	'	'	-769	-844
Valuation adjustments	'	'	-81	-461
Ending balance, net	1,184	2,392	1,184	2,392
Ending valuation allowance	'	'	-340	-846
Ending number of foreclosed assets	'	'	5	8
Proceeds from sale of foreclosed assets	'	'	869	1,010
Gain (loss) on sale of foreclosed assets	'	'	$100	$166

Premises_and_Equipment_Summary

Premises and Equipment - Summary of Premises and Equipment (Detail) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Property Plant And Equipment Net By Type [Abstract]	'	'
Land & land improvements	$5,922	$5,929
Buildings	30,082	23,090
Furniture and equipment	27,590	25,877
Premises and equipment, gross	63,594	54,896
Less: Accumulated depreciation	-32,393	-32,101
Premises and equipment less depreciation, gross	31,201	22,795
Construction in progress	45	4,190
Total premises and equipment	$31,246	$26,985

Premises_and_Equipment_Additio

Premises and Equipment - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Property Plant And Equipment [Abstract]	'	'	'	'
Depreciation expense for premises and equipment	$1,014,000	$820,000	$2,489,000	$2,450,000

Cash_Value_of_Life_Insurance_S

Cash Value of Life Insurance - Summary of the Activity in the Balance of Cash Value of Life Insurance (Detail) (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012
	Policies	Company
	Company	Employees
	Employees	Policies
Increase Decrease In Insurance Liabilities [Abstract]	'	'
Beginning balance	$50,582	$50,403
Increase in cash value of life insurance	1,337	1,350
Gain on life insurance death benefit	'	600
Death benefit	'	-1,611
Ending balance	51,919	50,742
End of period death benefit	$95,206	$95,132
Number of policies owned	133	136
Insurance companies used	6	6
Current and former employees and directors covered	36	37

Cash_Value_of_Life_Insurance_A

Cash Value of Life Insurance - Additional Information (Detail)	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
	Company	Company
	Policies
Insurance [Abstract]	'	'
Number of life insurance policies owned by the Company	133	'
Insurance companies used	6	6
Policies covering current and former employees and directors	36	'

Goodwill_and_Other_Intangible_2

Goodwill and Other Intangible Assets - Summary of Goodwill Intangible (Detail) (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013
Goodwill And Intangible Assets Disclosure [Abstract]	'
Goodwill, Beginning Balance	$15,519
Goodwill, Additions	'
Goodwill, Reductions	'
Goodwill, Ending Balance	$15,519

Goodwill_and_Other_Intangible_3

Goodwill and Other Intangible Assets - Summary of Core Deposit Intangibles (Detail) (Core Deposits [Member], USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013
Core Deposits [Member]	'
Finite-Lived Intangible Assets [Line Items]	'
Core deposit intangibles, Beginning balance	$1,460
Core deposit intangibles, Reductions	'
Core deposit intangibles, Additions	'
Core deposit intangibles, Ending balance	1,460
Accumulated amortization, Beginning balance	-368
Accumulated amortization, Reductions	-157
Accumulated amortization, Additions	'
Accumulated amortization, Ending balance	-525
Core deposit intangibles, net, Beginning balance	1,092
Core deposit intangibles, net, Reductions	-157
Core deposit intangibles, net, Additions	'
Core deposit intangibles, net, Ending balance	$935

Goodwill_and_Other_Intangible_4

Goodwill and Other Intangible Assets - Additional Information (Detail) (USD $)	Sep. 23, 2011	28-May-10
	Citizens [Member]	Granite [Member]
Goodwill [Line Items]	'	'
Additions to core deposit intangibles	$898,000	$562,000

Goodwill_and_Other_Intangible_5

Goodwill and Other Intangible Assets - Estimated Core Deposit Intangible Amortization (Detail) (Core Deposits [Member], USD $)	Sep. 30, 2013
In Thousands, unless otherwise specified
Core Deposits [Member]	'
Finite-Lived Intangible Assets [Line Items]	'
2013	$209
2014	209
2015	209
2016	209
2017	209
2018	$47

Mortgage_Servicing_Rights_Fair

Mortgage Servicing Rights - Fair Value of Mortgage Servicing Rights (Detail) (USD $)

3 Months Ended

9 Months Ended

3 Months Ended

9 Months Ended

In Thousands, unless otherwise specified

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2013

Jun. 30, 2013

Dec. 31, 2012

Sep. 30, 2012

Jun. 30, 2012

Dec. 31, 2011

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2013

Sep. 30, 2012

Loans [Member]

Loans [Member]

Loans [Member]

Loans [Member]

Loans [Member]

Loans [Member]

Mortgage servicing rights [Member]

Mortgage servicing rights [Member]

Mortgage servicing rights [Member]

Mortgage servicing rights [Member]

Servicing Assets at Fair Value [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Balance at beginning of period

'

'

'

'

$683,910

$682,176

$666,512

$642,110

$628,674

$598,185

$5,571

$4,757

$4,552

$4,603

Additions

'

'

'

'

'

'

'

'

'

'

298

409

1,187

1,395

Change in fair value

'

'

'

'

'

'

'

'

'

'

180

-681

310

-1,513

Balance at end of period

'

'

'

'

683,910

682,176

666,512

642,110

628,674

598,185

6,049

4,485

6,049

4,485

Servicing, late and ancillary fees received

$428

$389

$1,261

$1,140

'

'

'

'

'

'

'

'

'

'

Weighted-average prepayment speed (CPR)

'

'

11.00%

20.90%

'

'

'

'

'

'

'

'

'

'

Discount rate

'

'

10.00%

10.00%

'

'

'

'

'

'

'

'

'

'

Indemnification_Asset_A_Summar

Indemnification Asset - A Summary of the Activity in the Balance of Indemnification Asset (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Indemnification Asset [Abstract]	'	'	'	'
Beginning balance	$1,441	$4,046	$1,997	$4,405
Effect of actual covered losses and change in estimated future covered losses	-505	-87	-783	241
Reimbursable expenses (revenue), net	51	2	-42	12
Payments received	-126	-1,476	-311	-2,173
Ending balance	$861	$2,485	$861	$2,485

Other_Assets_Summary_of_Other_

Other Assets - Summary of Other Assets (Detail) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Deferred Costs Capitalized Prepaid And Other Assets Disclosure [Abstract]	'	'
Deferred tax asset, net	$29,046	$28,935
Prepaid expense including FDIC assessment and taxes	1,787	3,455
Software	1,347	1,550
Life insurance proceeds receivable	'	706
Advanced compensation	1,253	1,440
TriCo Capital Trust I & II	1,238	1,238
Miscellaneous other assets	568	1,283
Total other assets	$35,239	$38,607

Deposits_Summary_of_the_Balanc

Deposits - Summary of the Balances of Deposits (Detail) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Deposits [Abstract]	'	'
Noninterest-bearing demand	$656,266	$684,833
Interest-bearing demand	524,897	503,465
Savings	811,182	762,924
Time certificates, $100,000 and over	163,033	180,195
Other time certificates	137,933	158,285
Total deposits	$2,293,311	$2,289,702

Deposits_Additional_Informatio

Deposits - Additional Information (Detail) (USD $)	9 Months Ended	12 Months Ended
	Sep. 30, 2013	Dec. 31, 2012
Deposits [Abstract]	'	'
Certificate of deposit balances included in time certificates	$5,000,000	$5,000,000
Certificate of deposit included in time certificates	100,000	100,000
Overdrawn deposit balances classified as consumer loans	$1,255,000	$1,408,000

Reserve_for_Unfunded_Commitmen2

Reserve for Unfunded Commitments - Summary of the Activity in Reserve for Unfunded Commitments (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Commitments And Contingencies Disclosure [Abstract]	'	'	'	'
Balance at beginning of period	$3,210	$2,590	$3,615	$2,740
Change in reserve for unfunded commitments	-335	-35	-740	-185
Balance at end of period	$2,875	$2,555	$2,875	$2,555

Other_Liabilities_Components_o

Other Liabilities - Components of Other Liabilities (Detail) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Other Liabilities Disclosure [Abstract]	'	'
Deferred compensation	$7,158	$7,738
Supplemental retirement	17,275	16,345
Joint beneficiary agreements	2,951	2,736
Accrued legal settlement	'	2,090
Miscellaneous other liabilities	6,283	6,213
Total other liabilities	$33,667	$35,122

Other_Borrowings_Summary_of_th

Other Borrowings - Summary of the Balances of Other Borrowings (Detail) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Debt Instrument [Line Items]	'	'
Total other borrowings	$14,626	$9,197
Other collateralized borrowings, fixed rate, as of September 30, 2013 of 0.05% payable on October 1, 2013 [Member]	'	'
Debt Instrument [Line Items]	'	'
Other collateralized borrowings, fixed rate, as of September 30, 2013 of 0.05% payable on October 1, 2013	$14,626	$9,197

Other_Borrowings_Additional_In

Other Borrowings - Additional Information (Detail) (USD $)	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2013
			Other collateralized borrowings, fixed rate, as of September 30, 2013 of 0.05% payable on October 1, 2013 [Member]
Business Acquisition [Line Items]	'	'	'
Other collateralized borrowings	$14,626,000	$9,197,000	'
Repurchase investment securities sold and pledged as collateral under securities repurchase agreement	19,105,000	'	'
FHLB Collateral line of credit, maximum borrowings capacity	592,200,000	'	'
FHLB collateral line of credit, outstanding balance	'	'	'
FHLB collateral line of credit, remaining borrowing capacity	592,200,000	'	'
Loans designated as potential collateral under collateralized line of credit with FHLB	1,084,690,000	'	'
Collateralized line of credit with Federal Reserve Bank, maximum borrowings capacity	109,408,000	'	'
Collateralized line of credit with Federal Reserve Bank, outstanding balance	0	'	'
Collateralized line of credit with Federal Reserve Bank, remaining borrowing capacity	109,408,000	'	'
Investment securities designated as potential collateral under collateral line of credit with FRB	50,000	'	'
Loans designated as potential collateral under collateral line of credit with FRB	139,198,000	'	'
Unused correspondent banking lines of credit from commercial banks for federal funds	$10,000,000	'	'
FHLB fixed rate borrowings effective rate	'	'	0.05%
FHLB fixed rate borrowings maturity date	'	'	1-Oct-13

Junior_Subordinated_Debt_Addit

Junior Subordinated Debt - Additional Information (Detail) (USD $)	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2013	Jul. 31, 2003	Sep. 30, 2013	Jun. 22, 2004
			TriCo Capital Trust I [Member]	TriCo Capital Trust I [Member]	TriCo Capital Trust II [Member]	TriCo Capital Trust II [Member]
Changes In Equity And Comprehensive Income Line Items [Line Items]	'	'	'	'	'	'
Common stock shares issued	16,076,662	16,000,838	'	619	'	619
Common stock par value	'	'	'	$1,000	'	$1,000
Issuance of common stock, aggregate value	'	'	'	$619,000	'	$619,000
Issued Junior Subordinated Debenture to the trust	'	'	'	20,619,000	'	20,619,000
Offering of cumulative trust preferred securities	'	'	'	20,000	'	20,000
Cumulative trust preferred securities for cash in an aggregate amount	'	'	'	20,000,000	'	20,000,000
Redeem the trust preferred securities	'	'	7-Oct-33	'	23-Jul-34	'
LIBOR Rate, Description	'	'	'LIBOR plus 3.05%	'	'LIBOR plus 2.55%	'
Preferred securities redeemable interest rate	'	'	3.05%	'	2.55%	'
Company paid underwriting fees, per trust preferred security	'	'	$7.50	'	$2.50	'
Company paid underwriting fees aggregate	'	'	150,000	'	50,000	'
Net proceeds were used to finance the opening of new branches, services and technology	'	'	$19,850,000	'	$19,950,000	'
Debenture carried an interest rate	'	'	3.32%	'	2.81%	'

Commitments_and_Contingencies_1

Commitments and Contingencies - Additional Information (Detail) (USD $)	1 Months Ended		3 Months Ended		9 Months Ended
	Aug. 27, 2013	Sep. 16, 2012	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Mar. 31, 2013	Dec. 31, 2012	Aug. 21, 2007
					site
Conversion of Stock [Line Items]	'	'	'	'	'	'	'	'	'
Reserves to satisfy Federal regulatory requirements	'	'	$33,755,000	'	$33,755,000	'	'	$31,594,000	'
Number of sites leased under non-cancelable operating leases	'	'	'	'	48	'	'	'	'
Rent expense under operating leases	'	'	1,071,000	1,054,000	3,257,000	3,205,000	'	'	'
Commitment expiration date	'	'	'	'	'One year or less or other termination clauses and may require payment of a fee.	'	'	'	'
Letters of credit, issue period	'	'	'	'	'One year or less	'	'	'	'
Overdraft privilege receivable criteria	'	'	'	'	'All holders of such accounts who bring their accounts to a positive balance at least once every thirty days receive the overdraft privilege.	'	'	'	'
Class B common stock of Visa Inc.	'	'	16,076,662	'	16,076,662	'	'	16,000,838	15,814,662
Conversion ratio	'	'	'	'	'	'	0.4206	'	'
Former employee settlement minimum amount	'	2,039,500	'	'	'	'	'	'	'
Former employee settlement maximum amount	'	2,500,000	'	'	'	'	'	'	'
Recorded expense and accrued liability in anticipation of approval of this settlement	'	2,090,000	'	'	'	'	'	'	'
Loss contingency settlement date	'	7-May-13	'	'	'	'	'	'	'
Court approved final settlement agreement	2,429,000	'	'	'	'	'	'	'	'
Bank recorded an additional expense and accrued liability	339,000	'	'	'	'	'	'	'	'
Common Class B [Member]	'	'	'	'	'	'	'	'	'
Conversion of Stock [Line Items]	'	'	'	'	'	'	'	'	'
Class B common stock of Visa Inc.	'	'	'	'	'	'	10,214	'	'
Common Class A [Member]	'	'	'	'	'	'	'	'	'
Conversion of Stock [Line Items]	'	'	'	'	'	'	'	'	'
The value of the Class A shares	'	'	$191.10	'	$191.10	'	'	'	'
Value of unredeemed Class A equivalent shares	'	'	$821,000	'	$821,000	'	'	'	'

Commitments_and_Contingencies_2

Commitments and Contingencies - Future Minimum Commitments under Non-Cancelable Operating Leases with Initial or Remaining Terms of One Year or More (Detail) (USD $)	Dec. 31, 2012
In Thousands, unless otherwise specified
Leases [Abstract]	'
2013	$2,772
2014	2,417
2015	1,536
2016	954
2017	617
Thereafter	1,312
Future minimum lease payments	$9,608

Commitments_and_Contingencies_3

Commitments and Contingencies - Summary of the Bank's Commitments and Contingent Liabilities (Detail) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]	'	'
Commitments to extend credit	'	'
Commercial [Member]	'	'
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]	'	'
Commitments to extend credit	119,638	123,517
Other Consumer [Member]	'	'
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]	'	'
Commitments to extend credit	356,850	369,467
RE Mortgage [Member]	'	'
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]	'	'
Commitments to extend credit	31,926	27,959
Real estate construction loans [Member]	'	'
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]	'	'
Commitments to extend credit	22,003	36,311
Standby letters of credit [Member]	'	'
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]	'	'
Commitments to extend credit	2,013	2,905
Deposit account overdraft privilege [Member]	'	'
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]	'	'
Commitments to extend credit	$70,424	$69,675

Shareholders_Equity_Additional

Shareholders' Equity -Additional Information (Detail) (USD $)	9 Months Ended				9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012	Aug. 21, 2007	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012	Dec. 31, 2011
					Tri Countries Bank [Member]	Tri Countries Bank [Member]	Common Stock [Member]	Common Stock [Member]	Common Stock [Member]	Common Stock [Member]
Class of Stock [Line Items]	'	'	'	'	'	'	'	'	'	'
Cash dividends received	'	'	'	'	$6,080,000	$6,872,000	'	'	'	'
Shareholder Rights Plan	25-Jun-01	'	'	'	'	'	'	'	'	'
Amendment date of Rights Plan	8-Jul-01	'	'	'	'	'	'	'	'	'
Extended maturity date of Rights Plan	10-Jul-01	'	'	'	'	'	'	'	'	'
Percentage of restriction on acquiring outstanding common stock by person or group	15.00%	'	'	'	'	'	'	'	'	'
Portion of market value to acquire common stock or shares	'One-half of market value	'	'	'	'	'	'	'	'	'
Initial exercise price of rights	49	'	'	'	'	'	'	'	'	'
Redemption price of rights	0.01	'	'	'	'	'	'	'	'	'
Repurchase of common stock	'	'	'	500,000	'	'	'	'	'	'
Stock repurchase plan percentage of common stock	'	'	'	3.20%	'	'	'	'	'	'
Common stock, shares outstanding	16,076,662	'	16,000,838	15,814,662	'	'	16,076,662	15,992,893	16,000,838	15,978,958
Repurchased shares outstanding	166,600	'	'	'	'	'	'	'	'	'
Company's common stock in lieu of cash to exercise options to purchase shares	248,765	'	'	'	'	'	172,941	'	'	'
Market value of common stock	$3,240,000	$204,000	'	'	'	'	$3,240,000	$204,000	'	'

Stock_Options_and_Other_Equity2

Stock Options and Other Equity-Based Incentive Instruments - Additional Information (Detail) (USD $)	9 Months Ended
	Sep. 30, 2013	Dec. 31, 2012
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]	'	'
Outstanding options under the plan	1,281,670	1,393,935
Options currently not exercisable yet expected to vest	456,100	'
Weighted-average remaining contractual term	'3 years 2 months 12 days	'
Pre-tax compensation costs expected to recognize	$2,906,000	'
2009 Plan [Member]	'	'
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]	'	'
Number of shares to be reduced pursuant to stock option for computation of available number of shares for issuance	1	'
Number of shares to be reduced pursuant to restricted stock award for computation of available number of shares for issuance	2	'
Outstanding options under the plan	710,500	'
Options available for grant under the plan	927,500	'
2001 Plan [Member]	'	'
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]	'	'
Outstanding options under the plan	571,170	'
Options available for grant under the plan	0	'
Share based compensation grant expiry period	'10 years	'
Minimum [Member]	'	'
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]	'	'
Maximum aggregate number of shares of TriCo's common stock issued	650,000	'
Maximum [Member]	'	'
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]	'	'
Maximum aggregate number of shares of TriCo's common stock issued	1,650,000	'

Stock_Options_and_Other_Equity3

Stock Options and Other Equity-Based Incentive Instruments - Stock Option Activity (Detail) (USD $)	9 Months Ended
	Sep. 30, 2013
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]	'
Options granted, Weighted Average Fair Value on Date of Grant	$8.91
Options outstanding, Weighted Average Exercise Price, beginning balance	$17.07
Options granted, Weighted Average Exercise Price	$19.31
Options exercised, Weighted Average Exercise Price	$13.03
Options forfeited, Weighted Average Exercise Price	$24.23
Options outstanding, Weighted Average Exercise Price, ending balance	$18.06
Options outstanding, Number of Shares, beginning balance	1,393,935
Options granted, Number of Shares	144,500
Options exercised, Number of Shares	-248,765
Options forfeited, Number of Shares	-8,000
Options outstanding, Number of Shares, ending balance	1,281,670
Minimum [Member]	'
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]	'
Options outstanding, Option Price per Share, beginning balance	$12.60
Options granted, Option Price per Share	$16.59
Options exercised, Option Price per Share	$12.60
Options forfeited, Option Price per Share	$22.54
Options outstanding, Option Price per Share, ending balance	$12.63
Maximum [Member]	'
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]	'
Options outstanding, Option Price per Share, beginning balance	$25.91
Options granted, Option Price per Share	$19.46
Options exercised, Option Price per Share	$20.58
Options forfeited, Option Price per Share	$25.91
Options outstanding, Option Price per Share, ending balance	$25.91

Stock_Options_and_Other_Equity4

Stock Options and Other Equity-Based Incentive Instruments - Summary of Options Outstanding (Detail) (USD $)	9 Months Ended
In Thousands, except Share data, unless otherwise specified	Sep. 30, 2013
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]	'
Number of options	1,281,670
Weighted average exercise price	$18.06
Intrinsic value (in thousands)	$6,201
Weighted average remaining contractual term (yrs.)	'5 years 7 months 6 days
Currently Exercisable [Member]	'
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]	'
Number of options	825,570
Weighted average exercise price	$18.86
Intrinsic value (in thousands)	3,395
Weighted average remaining contractual term (yrs.)	'4 years
Currently Not Exercisable [Member]	'
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]	'
Number of options	456,100
Weighted average exercise price	$16.63
Intrinsic value (in thousands)	$2,806
Weighted average remaining contractual term (yrs.)	'8 years 6 months

Noninterest_Income_and_Expense2

Noninterest Income and Expenses - Components of Other Noninterest Income (Detail) (USD $)	3 Months Ended							9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Sep. 30, 2013	Sep. 30, 2012
Income Statement [Abstract]	'	'	'	'	'	'	'	'	'
Service charges on deposit accounts	$3,353	'	'	'	$3,617	'	'	$9,770	$10,788
ATM and interchange fees	2,132	'	'	'	1,877	'	'	6,240	5,722
Other service fees	562	'	'	'	567	'	'	1,683	1,740
Mortgage banking service fees	434	'	'	'	403	'	'	1,280	1,154
Change in value of mortgage servicing rights	181	'	'	'	-681	'	'	311	-1,513
Total service charges and fees	6,662	'	'	'	5,783	'	'	19,284	17,890
Gain on sale of loans	1,083	'	'	'	1,430	'	'	4,967	4,317
Commissions on sale of non-deposit investment products	692	'	'	'	803	'	'	2,294	2,464
Increase in cash value of life insurance	531	'	'	'	450	'	'	1,337	1,350
Change in indemnification asset	-461	'	'	'	-94	'	'	-876	215
Gain on sale of foreclosed assets	313	'	'	'	419	'	'	1,479	364
Sale of customer checks	97	'	'	'	90	'	'	280	256
Lease brokerage income	75	'	'	'	80	'	'	273	228
Gain (loss) on disposal of fixed assets	2	'	'	'	-16	'	'	-12	-404
Commission rebates	'	'	'	'	-17	'	'	'	-51
Gain on life insurance death benefit	'	'	'	'	'	'	'	'	600
Other	133	'	'	'	199	'	'	166	740
Total other noninterest income	2,465	'	'	'	3,344	'	'	10,192	10,079
Total noninterest income	$9,127	$10,131	$10,218	$10,011	$9,127	$10,577	$8,265	$29,476	$27,969

Noninterest_Income_and_Expense3

Noninterest Income and Expenses - Components of Noninterest Expense (Detail) (USD $)	3 Months Ended							9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Sep. 30, 2013	Sep. 30, 2012
Income Statement [Abstract]	'	'	'	'	'	'	'	'	'
Base salaries, net of deferred loan origination costs	$8,716	'	'	'	$8,337	'	'	$25,572	$24,769
Incentive compensation	1,166	'	'	'	1,254	'	'	3,751	3,976
Benefits and other compensation costs	2,979	'	'	'	2,771	'	'	9,389	8,869
Total salaries and benefits expense	12,861	'	'	'	12,362	'	'	38,712	37,614
Occupancy	1,925	'	'	'	1,851	'	'	5,337	5,424
Equipment	1,089	'	'	'	1,138	'	'	3,036	3,381
Data processing and software	1,184	'	'	'	1,017	'	'	3,542	3,589
ATM network charges	626	'	'	'	529	'	'	1,801	1,628
Telecommunications	629	'	'	'	553	'	'	1,741	1,675
Postage	269	'	'	'	230	'	'	633	704
Courier service	217	'	'	'	270	'	'	639	715
Advertising	492	'	'	'	710	'	'	1,232	2,071
Assessments	572	'	'	'	590	'	'	1,721	1,786
Operational losses	137	'	'	'	171	'	'	376	430
Professional fees	741	'	'	'	832	'	'	1,885	1,946
Foreclosed assets expense	48	'	'	'	284	'	'	310	1,076
Provision for foreclosed asset losses	47	'	'	'	433	'	'	620	1,520
Change in reserve for unfunded commitments	-335	'	'	'	-35	'	'	-740	-185
Intangible amortization	53	'	'	'	52	'	'	157	157
Legal settlement	339	'	'	'	2,090	'	'	339	2,090
Other	2,722	'	'	'	2,513	'	'	7,385	7,251
Total other noninterest expense	10,755	'	'	'	13,228	'	'	30,014	35,258
Total noninterest expense	$23,616	$23,509	$21,601	$25,126	$25,590	$24,367	$22,915	$68,726	$72,872

Income_Taxes_Reconciliation_of

Income Taxes - Reconciliation of Effective Tax Rate and Statutory Federal Income Tax Rate (Detail)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Income Tax Disclosure [Abstract]	'	'	'	'
Federal statutory income tax rate	35.00%	35.00%	35.00%	35.00%
State income taxes, net of federal tax benefit	6.70%	6.90%	6.70%	6.60%
Tax-exempt interest on municipal obligations	-0.50%	-0.40%	-0.40%	-0.50%
Increase in cash value of insurance policies	-1.50%	-1.80%	-1.30%	-2.00%
Other	0.30%	2.20%	0.40%	0.90%
Effective Tax Rate	40.00%	41.90%	40.40%	40.00%

Earnings_Per_Share_Computation

Earnings Per Share - Computation of Earnings per Share (Detail) (USD $)	3 Months Ended								9 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Sep. 30, 2013	Sep. 30, 2012
Earnings Per Share [Abstract]	'	'	'	'	'	'	'	'	'	'
Net income	'	$7,361	$6,325	$8,477	$4,722	$5,020	$5,321	$3,931	$22,163	$14,272
Average number of common shares outstanding	'	16,074	'	'	'	15,993	'	'	16,035	15,989
Effect of dilutive stock options	'	156	'	'	'	59	'	'	117	61
Average number of common shares outstanding used to calculate diluted earnings per share	'	16,230	'	'	'	16,052	'	'	16,152	16,050
Options excluded from diluted earnings per share because the effect of these options was antidilutive	'	171	'	'	'	992	'	'	544	967

Comprehensive_Income_Component

Comprehensive Income - Components of Other Comprehensive Income and Related Tax Effects (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Equity [Abstract]	'	'	'	'
Unrealized holding gains (losses) on available-for-sale securities	$144	$168	($3,498)	($304)
Tax effect	-61	-70	1,471	128
Unrealized holding gains (losses) on available-for-sale securities, net of tax	$83	$98	($2,027)	($176)

Comprehensive_Income_Component1

Comprehensive Income - Components of Accumulated Other Comprehensive Income (Detail) (USD $)	9 Months Ended	12 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Equity [Abstract]	'	'
Net unrealized gains on available-for-sale securities	$4,936	$8,434
Tax effect	-2,076	-3,547
Unrealized holding gains on available-for-sale securities, net of tax	2,860	4,887
Pension liability	-3,806	-3,806
Tax effect	1,600	1,600
Pension liability, net of tax	-2,206	-2,206
Joint beneficiary agreement liability	-522	-522
Tax effect	'	'
Joint beneficiary agreement liability, net of tax	-522	-522
Accumulated other comprehensive income (loss)	$132	$2,159

Retirement_Plans_Net_Periodic_

Retirement Plans - Net Periodic Benefit Cost Recognized for the Plans (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Net pension cost included the following components:	'	'	'	'
Service cost-benefits earned during the period	$187	$170	$557	$510
Interest cost on projected benefit obligation	161	172	482	515
Amortization of net obligation at transition	'	'	1	1
Amortization of prior service cost	39	38	115	115
Recognized net actuarial loss	73	72	218	216
Net periodic pension cost	460	452	1,373	1,357
Company contributions to pension plans	151	106	411	366
Pension plan payouts to participants	$151	$106	$411	$366

Retirement_Plans_Additional_In

Retirement Plans - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2013
					Forecast [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]	'	'	'	'	'
Contribution and paid out as benefits	$151,000	$106,000	$411,000	$366,000	$537,000

Related_Party_Transactions_Sum

Related Party Transactions - Summary of Loan Activity (Detail) (USD $)	9 Months Ended	12 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Related Party Transaction Due From To Related Party Noncurrent [Abstract]	'	'
Beginning balance	$2,368	$1,764
Advances/new loans	277	1,568
Removed/payments	-1,071	-964
Ending balance	$1,574	$2,368

Related_Party_Transactions_Add

Related Party Transactions - Additional Information (Detail) (Modern Building Inc [Member], USD $)	9 Months Ended	12 Months Ended
	Sep. 30, 2013	Dec. 31, 2012
Modern Building Inc [Member]	'	'
Related Party Transaction [Line Items]	'	'
Construction services	$3,075,000	$3,924,000

Fair_Value_Measurement_Recorde

Fair Value Measurement - Recorded Amount of Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) (Fair Value, Measurements, Recurring [Member], USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]	'	'
Total assets measured at fair value	$121,264	$167,579
Obligations of U.S. government corporations and agencies [Member]	'	'
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]	'	'
Total assets measured at fair value	105,401	151,701
Obligations of states and political subdivisions [Member]	'	'
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]	'	'
Total assets measured at fair value	7,905	9,421
Corporate debt securities [Member]	'	'
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]	'	'
Total assets measured at fair value	1,909	1,905
Mortgage servicing rights [Member]	'	'
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]	'	'
Total assets measured at fair value	6,049	4,552
Level 1 [Member]	'	'
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]	'	'
Total assets measured at fair value	'	'
Level 1 [Member] | Obligations of U.S. government corporations and agencies [Member]	'	'
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]	'	'
Total assets measured at fair value	'	'
Level 1 [Member] | Obligations of states and political subdivisions [Member]	'	'
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]	'	'
Total assets measured at fair value	'	'
Level 1 [Member] | Corporate debt securities [Member]	'	'
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]	'	'
Total assets measured at fair value	'	'
Level 1 [Member] | Mortgage servicing rights [Member]	'	'
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]	'	'
Total assets measured at fair value	'	'
Level 2 [Member]	'	'
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]	'	'
Total assets measured at fair value	115,215	163,027
Level 2 [Member] | Obligations of U.S. government corporations and agencies [Member]	'	'
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]	'	'
Total assets measured at fair value	105,401	151,701
Level 2 [Member] | Obligations of states and political subdivisions [Member]	'	'
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]	'	'
Total assets measured at fair value	7,905	9,421
Level 2 [Member] | Corporate debt securities [Member]	'	'
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]	'	'
Total assets measured at fair value	1,909	1,905
Level 2 [Member] | Mortgage servicing rights [Member]	'	'
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]	'	'
Total assets measured at fair value	'	'
Level 3 [Member]	'	'
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]	'	'
Total assets measured at fair value	6,049	4,552
Level 3 [Member] | Obligations of U.S. government corporations and agencies [Member]	'	'
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]	'	'
Total assets measured at fair value	'	'
Level 3 [Member] | Obligations of states and political subdivisions [Member]	'	'
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]	'	'
Total assets measured at fair value	'	'
Level 3 [Member] | Corporate debt securities [Member]	'	'
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]	'	'
Total assets measured at fair value	'	'
Level 3 [Member] | Mortgage servicing rights [Member]	'	'
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]	'	'
Total assets measured at fair value	$6,049	$4,552

Fair_Value_Measurement_Reconci

Fair Value Measurement - Reconciliation of Assets and Liabilities Measured at Fair Value Using Significant Unobservable Inputs (Level 3) on Recurring Basis (Detail) (Mortgage servicing rights [Member], USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Mortgage servicing rights [Member]	'	'	'	'
Fair Value Liabilities Measured On Recurring and Nonrecurring Basis [Line Items]	'	'	'	'
Beginning Balance	$5,571	$4,757	$4,552	$4,603
Transfers into (out of) Level 3	'	'	'	'
Change Included in Earnings	180	-681	310	-1,513
Issuances	298	409	1,187	1,395
Ending Balance	$6,049	$4,485	$6,049	$4,485

Fair_Value_Measurement_Quantit

Fair Value Measurement - Quantitative Information about Recurring Level 3 Fair Value Measurements (Detail) (USD $)	3 Months Ended	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2013	Sep. 30, 2012
Fair Value Inputs, Assets, Quantitative Information [Line Items]	'	'	'
Constant prepayment rate	'	11.00%	20.90%
Discount rate	'	10.00%	10.00%
Mortgage servicing rights [Member]	'	'	'
Fair Value Inputs, Assets, Quantitative Information [Line Items]	'	'	'
Mortgages servicing rights fair value	6,049	6,049	'
Valuation Technique	'	'Discounted cash flow	'
Minimum [Member] | Mortgage servicing rights [Member]	'	'	'
Fair Value Inputs, Assets, Quantitative Information [Line Items]	'	'	'
Constant prepayment rate	'	6.90%	'
Discount rate	'	10.00%	'
Maximum [Member] | Mortgage servicing rights [Member]	'	'	'
Fair Value Inputs, Assets, Quantitative Information [Line Items]	'	'	'
Constant prepayment rate	'	33.00%	'
Discount rate	'	10.00%	'
Weighted Average [Member] | Mortgage servicing rights [Member]	'	'	'
Fair Value Inputs, Assets, Quantitative Information [Line Items]	'	'	'
Constant prepayment rate	'	11.00%	'
Discount rate	'	10.00%	'

Fair_Value_Measurement_Assets_

Fair Value Measurement - Assets and Liabilities Measured at Fair Value on Nonrecurring Basis (Detail) (USD $)	Sep. 30, 2013	Sep. 30, 2012
In Thousands, unless otherwise specified
Impaired originated & PNCI loans [Member]	'	'
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]	'	'
Total assets measured at fair value	$22,638	'
Foreclosed assets [Member]	'	'
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]	'	'
Total assets measured at fair value	2,049	'
Fair value nonrecurring basis [Member]	'	'
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]	'	'
Total assets measured at fair value	24,687	28,426
Fair value nonrecurring basis [Member] | Impaired originated & PNCI loans [Member]	'	'
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]	'	'
Total assets measured at fair value	22,638	18,241
Fair value nonrecurring basis [Member] | Foreclosed assets [Member]	'	'
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]	'	'
Total assets measured at fair value	2,049	10,185
Fair value nonrecurring basis [Member] | Level 1 [Member]	'	'
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]	'	'
Total assets measured at fair value	'	'
Fair value nonrecurring basis [Member] | Level 1 [Member] | Impaired originated & PNCI loans [Member]	'	'
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]	'	'
Total assets measured at fair value	'	'
Fair value nonrecurring basis [Member] | Level 1 [Member] | Foreclosed assets [Member]	'	'
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]	'	'
Total assets measured at fair value	'	'
Fair value nonrecurring basis [Member] | Level 2 [Member]	'	'
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]	'	'
Total assets measured at fair value	'	'
Fair value nonrecurring basis [Member] | Level 2 [Member] | Impaired originated & PNCI loans [Member]	'	'
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]	'	'
Total assets measured at fair value	'	'
Fair value nonrecurring basis [Member] | Level 2 [Member] | Foreclosed assets [Member]	'	'
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]	'	'
Total assets measured at fair value	'	'
Fair value nonrecurring basis [Member] | Level 3 [Member]	'	'
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]	'	'
Total assets measured at fair value	24,687	28,426
Fair value nonrecurring basis [Member] | Level 3 [Member] | Impaired originated & PNCI loans [Member]	'	'
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]	'	'
Total assets measured at fair value	22,638	18,241
Fair value nonrecurring basis [Member] | Level 3 [Member] | Foreclosed assets [Member]	'	'
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]	'	'
Total assets measured at fair value	$2,049	$10,185

Fair_Value_Measurement_Losses_

Fair Value Measurement - Losses Resulting from Nonrecurring Fair Value Adjustments that Occurred in Periods Indicated (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Fair Value Disclosures [Abstract]	'	'	'	'
Impaired Originated & PNCI loans	$258	$655	$2,836	$1,317
Foreclosed assets	'	433	620	1,520
Total loss from nonrecurring fair value adjustments	$258	$1,088	$3,367	$2,837

Fair_Value_Measurement_Additio

Fair Value Measurement - Additional Information (Detail) (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013
Fair Value Disclosures [Abstract]	'
Carrying value of loans fully charged-off	$0

Fair_Value_Measurement_Quantit1

Fair Value Measurement - Quantitative Information About Level 3 Fair Value Measurements for Financial Instruments Measured at Fair Value on Nonrecurring Basis (Detail) (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013
Impaired originated & PNCI loans [Member]	'
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]	'
Fair Value	22,638
Foreclosed assets [Member]	'
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]	'
Fair Value	2,049
Level 3 [Member] | Sales comparison approach [Member] | Impaired originated & PNCI loans [Member]	'
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]	'
Valuation Technique	'Sales comparison approach
Level 3 [Member] | Sales comparison approach [Member] | Foreclosed assets [Member]	'
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]	'
Valuation Technique	'Sales comparison approach
Level 3 [Member] | Sales comparison approach [Member] | Minimum [Member] | Impaired originated & PNCI loans [Member]	'
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]	'
Adjustment for differences between comparable sales	5.00%
Level 3 [Member] | Sales comparison approach [Member] | Minimum [Member] | Foreclosed assets [Member]	'
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]	'
Adjustment for differences between comparable sales	5.00%
Level 3 [Member] | Sales comparison approach [Member] | Maximum [Member] | Impaired originated & PNCI loans [Member]	'
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]	'
Adjustment for differences between comparable sales	41.00%
Level 3 [Member] | Sales comparison approach [Member] | Maximum [Member] | Foreclosed assets [Member]	'
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]	'
Adjustment for differences between comparable sales	5.00%
Level 3 [Member] | Sales comparison approach [Member] | Weighted Average [Member] | Impaired originated & PNCI loans [Member]	'
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]	'
Adjustment for differences between comparable sales	9.33%
Level 3 [Member] | Sales comparison approach [Member] | Weighted Average [Member] | Foreclosed assets [Member]	'
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]	'
Adjustment for differences between comparable sales	5.00%
Level 3 [Member] | Income approach [Member] | Impaired originated & PNCI loans [Member]	'
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]	'
Valuation Technique	'Income approach
Level 3 [Member] | Income approach [Member] | Minimum [Member] | Impaired originated & PNCI loans [Member]	'
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]	'
Capitalization rate	6.70%
Level 3 [Member] | Income approach [Member] | Maximum [Member] | Impaired originated & PNCI loans [Member]	'
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]	'
Capitalization rate	9.00%
Level 3 [Member] | Income approach [Member] | Weighted Average [Member] | Impaired originated & PNCI loans [Member]	'
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]	'
Capitalization rate	8.99%

Fair_Value_Measurement_Estimat

Fair Value Measurement - Estimated Fair Values of Financial Instruments that are Reported at Amortized Cost in Consolidated Balance Sheets (Detail) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Financial assets:	'	'
Cash and due from banks	$69,173	$81,086
Accrued interest receivable	6,450	6,636
Indemnification asset	861	1,997
Financial liabilities:	'	'
Accrued interest payable	937	1,036
Other borrowings	14,626	9,197
Junior subordinated debt	41,238	41,238
Contract Amount [Member] | Level 3 [Member]	'	'
Off-balance sheet:	'	'
Commitments	530,417	557,254
Standby letters of credit	2,013	2,905
Overdraft privilege commitments	70,424	69,675
Fair Value [Member] | Level 3 [Member]	'	'
Financial assets:	'	'
Loans, net	1,714,658	1,607,044
Indemnification asset	861	1,997
Off-balance sheet:	'	'
Commitments	5,304	5,573
Standby letters of credit	20	29
Overdraft privilege commitments	704	697
Fair Value [Member] | Level 1 [Member]	'	'
Financial assets:	'	'
Cash and due from banks	69,173	81,086
Cash at Federal Reserve and other banks	471,977	667,813
Fair Value [Member] | Level 2 [Member]	'	'
Financial assets:	'	'
Restricted equity securities	9,163	9,647
Loans held for sale	3,247	12,053
Accrued interest receivable	6,450	6,636
Financial liabilities:	'	'
Deposits	2,294,425	2,291,841
Accrued interest payable	937	1,036
Other borrowings	14,626	9,197
Junior subordinated debt	25,980	28,042
Carrying Amount [Member] | Level 3 [Member]	'	'
Financial assets:	'	'
Loans, net	1,617,711	1,522,175
Indemnification asset	861	1,997
Carrying Amount [Member] | Level 1 [Member]	'	'
Financial assets:	'	'
Cash and due from banks	69,173	81,086
Cash at Federal Reserve and other banks	471,977	667,813
Carrying Amount [Member] | Level 2 [Member]	'	'
Financial assets:	'	'
Restricted equity securities	9,163	9,647
Loans held for sale	3,247	12,053
Accrued interest receivable	6,450	6,636
Financial liabilities:	'	'
Deposits	2,293,311	2,289,702
Accrued interest payable	937	1,036
Other borrowings	14,626	9,197
Junior subordinated debt	$41,238	$41,238

TriCo_Bancshares_Condensed_Fin2

TriCo Bancshares Condensed Financial Statements (Parent Only) - Condensed Balance Sheets (Detail) (USD $)	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2012	Dec. 31, 2011
In Thousands, unless otherwise specified
Assets	'	'	'	'
Cash and Cash equivalents	$541,150	$748,899	$622,494	$637,275
Other assets	35,239	38,607	'	'
Total assets	2,632,106	2,609,269	'	'
Liabilities and shareholders' equity	'	'	'	'
Other liabilities	33,667	35,122	'	'
Junior subordinated debt	41,238	41,238	'	'
Total liabilities	2,386,654	2,379,910	'	'
Shareholders' equity:	'	'	'	'
Common stock, no par value authorized 50,000,000 shares; issued and outstanding 16,076,662 and 16,000,838 shares, respectively	89,054	85,561	'	'
Retained earnings	156,266	141,639	'	'
Accumulated other comprehensive loss, net	132	2,159	'	'
Total shareholders' equity	245,452	229,359	227,197	216,441
Total liabilities and shareholders' equity	2,632,106	2,609,269	'	'
Parent [Member]	'	'	'	'
Assets	'	'	'	'
Cash and Cash equivalents	2,489	2,511	2,578	706
Investment in Tri Counties Bank	283,228	267,118	'	'
Other assets	1,238	1,238	'	'
Total assets	286,955	270,867	'	'
Liabilities and shareholders' equity	'	'	'	'
Other liabilities	265	270	'	'
Junior subordinated debt	41,238	41,238	'	'
Total liabilities	41,503	41,508	'	'
Shareholders' equity:	'	'	'	'
Common stock, no par value authorized 50,000,000 shares; issued and outstanding 16,076,662 and 16,000,838 shares, respectively	89,054	85,561	'	'
Retained earnings	156,266	141,639	'	'
Accumulated other comprehensive loss, net	132	2,159	'	'
Total shareholders' equity	245,452	229,359	'	'
Total liabilities and shareholders' equity	$286,955	$270,867	'	'

TriCo_Bancshares_Condensed_Fin3

TriCo Bancshares Condensed Financial Statements (Parent Only) - Condensed Balance Sheets (Parenthetical) (Detail) (USD $)	Sep. 30, 2013	Dec. 31, 2012	Aug. 21, 2007
Condensed Financial Statements, Captions [Line Items]	'	'	'
Common stock, no par value	'	'	'
Common stock, shares authorized	50,000,000	50,000,000	'
Common stock, shares issued	16,076,662	16,000,838	'
Common stock, shares outstanding	16,076,662	16,000,838	15,814,662
Parent [Member]	'	'	'
Condensed Financial Statements, Captions [Line Items]	'	'	'
Common stock, no par value	'	'	'
Common stock, shares authorized	50,000,000	50,000,000	'
Common stock, shares issued	16,076,662	16,000,838	'
Common stock, shares outstanding	16,076,662	16,000,838	'

TriCo_Bancshares_Condensed_Fin4

TriCo Bancshares Condensed Financial Statements (Parent Only) - Condensed Statements of Income (Detail) (USD $)	3 Months Ended								9 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Sep. 30, 2013	Sep. 30, 2012
Condensed Financial Statements, Captions [Line Items]	'	'	'	'	'	'	'	'	'	'
Interest expense	'	$1,169	$1,167	$1,237	$1,372	$1,834	$2,010	$2,128	$3,573	$5,972
Income before income taxes	'	12,271	10,597	14,294	8,132	8,636	8,773	6,390	37,162	23,799
Equity in net income of Tri Counties Bank:	'	'	'	'	'	'	'	'	'	'
Income tax benefit	'	-4,910	-4,272	-5,817	-3,410	-3,616	-3,452	-2,459	-14,999	-9,527
Net income	'	7,361	6,325	8,477	4,722	5,020	5,321	3,931	22,163	14,272
Parent [Member]	'	'	'	'	'	'	'	'	'	'
Condensed Financial Statements, Captions [Line Items]	'	'	'	'	'	'	'	'	'	'
Interest expense	'	314	'	'	'	333	'	'	936	1,003
Administration expense	'	191	'	'	'	131	'	'	568	445
Income before income taxes	'	-505	'	'	'	-464	'	'	-1,504	-1,448
Equity in net income of Tri Counties Bank:	'	'	'	'	'	'	'	'	'	'
Distributed	'	2,300	'	'	'	1,550	'	'	6,080	6,872
(Over) under distributed	'	5,354	'	'	'	3,739	'	'	16,955	8,244
Income tax benefit	'	212	'	'	'	195	'	'	632	604
Net income	'	$7,361	'	'	'	$5,020	'	'	$22,163	$14,272

TriCo_Bancshares_Condensed_Fin5

TriCo Bancshares Condensed Financial Statements (Parent Only) - Condensed Statements of Comprehensive Income (Detail) (USD $)	3 Months Ended								9 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Sep. 30, 2013	Sep. 30, 2012
Condensed Financial Statements, Captions [Line Items]	'	'	'	'	'	'	'	'	'	'
Net income	'	$7,361	$6,325	$8,477	$4,722	$5,020	$5,321	$3,931	$22,163	$14,272
Other comprehensive income, net of tax:	'	'	'	'	'	'	'	'	'	'
Unrealized holding gains (losses) on securities arising during the period	'	83	'	'	'	98	'	'	-2,027	-176
Other comprehensive loss	'	83	'	'	'	98	'	'	-2,027	-176
Comprehensive income	'	7,444	'	'	'	5,118	'	'	20,136	14,096
Parent [Member]	'	'	'	'	'	'	'	'	'	'
Condensed Financial Statements, Captions [Line Items]	'	'	'	'	'	'	'	'	'	'
Net income	'	7,361	'	'	'	5,020	'	'	22,163	14,272
Other comprehensive income, net of tax:	'	'	'	'	'	'	'	'	'	'
Unrealized holding gains (losses) on securities arising during the period	'	83	'	'	'	98	'	'	-2,027	-176
Other comprehensive loss	'	83	'	'	'	98	'	'	-2,027	-176
Comprehensive income	'	$7,444	'	'	'	$5,118	'	'	$20,136	$14,096

TriCo_Bancshares_Condensed_Fin6

TriCo Bancshares Condensed Financial Statements (Parent Only) - Condensed Statements of Cash Flows (Detail) (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012
Operating activities:	'	'
Net income	$22,163	$14,272
Adjustments to reconcile net income to net cash provided by operating activities:	'	'
Stock option vesting expense	849	800
Stock option excess tax benefits	-356	-21
Net cash from operating activities	33,632	30,762
Financing activities:	'	'
Stock option excess tax benefits	356	21
Repurchase of common stock	-501	-48
Cash dividends paid - common	-4,976	-4,317
Net cash provided (used) in financing activities	4,168	-56,362
Net change in cash and cash equivalents	-207,749	-14,781
Cash and cash equivalents at beginning of period	748,899	637,275
Cash and cash equivalents at end of period	541,150	622,494
Parent [Member]	'	'
Operating activities:	'	'
Net income	22,163	14,272
Adjustments to reconcile net income to net cash provided by operating activities:	'	'
Over (under) distributed equity in earnings of Tri Counties Bank	-16,955	-8,244
Stock option vesting expense	849	800
Stock option excess tax benefits	-356	-21
Net change in other assets and liabilities	-853	-747
Net cash from operating activities	4,848	6,060
Financing activities:	'	'
Issuance of common stock through option exercise	356	156
Stock option excess tax benefits	251	21
Repurchase of common stock	-501	-48
Cash dividends paid - common	-4,976	-4,317
Net cash provided (used) in financing activities	-4,870	-4,188
Net change in cash and cash equivalents	-22	1,872
Cash and cash equivalents at beginning of period	2,511	706
Cash and cash equivalents at end of period	$2,489	$2,578

Regulatory_Matters_Actual_Capi

Regulatory Matters - Actual Capital Amounts and Ratios of the Bank (Detail) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Tri Countries Bank [Member]	'	'
Schedule of Capitalization [Line Items]	'	'
Total Capital (to Risk Weighted Assets), Actual, Amount	$290,852	$271,723
Tier 1 Capital (to Risk Weighted Assets), Actual, Amount	266,036	247,892
Tier 1 Capital (to Average Assets), Actual, Amount	266,036	247,892
Total Capital (to Risk Weighted Assets), Actual, Ratio	14.78%	14.42%
Tier 1 Capital (to Risk Weighted Assets), Actual, Ratio	13.52%	13.16%
Tier 1 Capital (to Average Assets), Actual, Ratio	10.29%	9.73%
Total Capital (to Risk Weighted Assets), Minimum Capital Requirement, Amount	157,432	150,796
Tier 1 Capital (to Risk Weighted Assets), Minimum Capital Requirement, Amount	78,716	75,398
Tier 1 Capital (to Average Assets), Minimum Capital Requirement, Amount	103,395	101,866
Total Capital (to Risk Weighted Assets), Minimum Capital Requirement, Ratio	8.00%	8.00%
Tier 1 Capital (to Risk Weighted Assets), Minimum Capital Requirement, Ratio	4.00%	4.00%
Tier 1 Capital (to Average Assets), Minimum Capital Requirement, Ratio	4.00%	4.00%
Total Capital (to Risk Weighted Assets), Minimum to be Well Capitalized Under Prompt Corrective Action Provisions, Amount	196,916	188,495
Tier 1 Capital (to Risk Weighted Assets), Minimum to be Well Capitalized Under Prompt Corrective Action Provisions, Amount	118,149	113,097
Tier 1 Capital (to Average Assets), Minimum to be Well Capitalized Under Prompt Corrective Action Provisions, Amount	129,309	127,333
Total Capital (to Risk Weighted Assets), Minimum to be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	10.00%	10.00%
Tier 1 Capital (to Risk Weighted Assets), Minimum to be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	6.00%	6.00%
Tier 1 Capital (to Average Assets), Minimum to be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	5.00%	5.00%
Parent [Member]	'	'
Schedule of Capitalization [Line Items]	'	'
Total Capital (to Risk Weighted Assets), Actual, Amount	293,093	273,979
Tier 1 Capital (to Risk Weighted Assets), Actual, Amount	268,261	250,133
Tier 1 Capital (to Average Assets), Actual, Amount	268,261	250,133
Total Capital (to Risk Weighted Assets), Actual, Ratio	14.88%	14.53%
Tier 1 Capital (to Risk Weighted Assets), Actual, Ratio	13.62%	13.27%
Tier 1 Capital (to Average Assets), Actual, Ratio	10.37%	9.82%
Total Capital (to Risk Weighted Assets), Minimum Capital Requirement, Amount	157,533	150,896
Tier 1 Capital (to Risk Weighted Assets), Minimum Capital Requirement, Amount	78,766	75,448
Tier 1 Capital (to Average Assets), Minimum Capital Requirement, Amount	$103,447	$101,918
Total Capital (to Risk Weighted Assets), Minimum Capital Requirement, Ratio	8.00%	8.00%
Tier 1 Capital (to Risk Weighted Assets), Minimum Capital Requirement, Ratio	4.00%	4.00%
Tier 1 Capital (to Average Assets), Minimum Capital Requirement, Ratio	4.00%	4.00%

Summary_of_Quarterly_Results_o2

Summary of Quarterly Results of Operations (unaudited) - Result of Operations (Detail) (USD $)	3 Months Ended								9 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Sep. 30, 2013	Sep. 30, 2012
Loans:	'	'	'	'	'	'	'	'	'	'
Discount accretion PCI - cash basis	'	$140	$129	$167	$42	$24	$108	$18	'	'
Discount accretion PCI - other	'	898	732	597	979	1,192	886	776	'	'
Discount accretion PNCI	'	1,115	815	766	841	591	1,391	1,286	'	'
All other loan interest income	'	22,970	22,207	22,542	22,383	23,723	23,407	22,849	'	'
Total loan interest income	'	25,123	23,883	24,072	24,245	25,530	25,792	24,929	'	'
Debt securities, dividends and interest bearing cash at Banks (not FTE)	'	2,413	1,873	1,734	1,898	1,935	2,152	2,235	'	'
Total interest and dividend income	'	27,536	25,756	25,806	26,143	27,465	27,944	27,164	79,098	82,573
Interest expense	'	1,169	1,167	1,237	1,372	1,834	2,010	2,128	3,573	5,972
Net interest income	'	26,367	24,589	24,569	24,771	25,631	25,934	25,036	75,525	76,601
Reversal of provision for loan losses	'	-393	614	-1,108	1,524	532	3,371	3,996	-887	7,899
Net interest income after provision for loan losses	'	26,760	23,975	25,677	23,247	25,099	22,563	21,040	76,412	68,702
Noninterest income	'	9,127	10,131	10,218	10,011	9,127	10,577	8,265	29,476	27,969
Noninterest expense	'	23,616	23,509	21,601	25,126	25,590	24,367	22,915	68,726	72,872
Income before income taxes	'	12,271	10,597	14,294	8,132	8,636	8,773	6,390	37,162	23,799
Income tax benefit / expense	'	4,910	4,272	5,817	3,410	3,616	3,452	2,459	14,999	9,527
Net income	'	$7,361	$6,325	$8,477	$4,722	$5,020	$5,321	$3,931	$22,163	$14,272
Per common share:	'	'	'	'	'	'	'	'	'	'
Net income (diluted)	'	$0.45	$0.39	$0.53	$0.29	$0.31	$0.33	$0.25	$1.37	$0.89
Dividends	'	$0.11	$0.11	$0.09	$0.09	$0.09	$0.09	$0.09	'	'