Ameris Bancorp (ABCB) 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	Oct. 31, 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	'
Entity Registrant Name	'Ameris Bancorp	'
Entity Central Index Key	'0000351569	'
Current Fiscal Year End Date	'--12-31	'
Entity Filer Category	'Accelerated Filer	'
Entity Common Stock, Shares Outstanding	'	23,905,509

Consolidated_Balance_Sheets

Consolidated Balance Sheets (USD $)	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2012
In Thousands, unless otherwise specified
Assets	'	'	'
Cash and due from banks	$53,516	$80,256	$57,289
Federal funds sold and interest-bearing accounts	73,899	193,677	66,872
Investment securities available for sale, at fair value	312,248	346,909	361,051
Other investments	7,764	6,832	7,003
Mortgage loans held for sale	69,634	48,786	29,021
Loans	1,589,267	1,450,635	1,439,862
Covered loans	417,649	507,712	546,234
Less: allowance for loan losses	23,854	23,593	25,901
Loans, net	1,983,062	1,934,754	1,960,195
Other real estate owned	37,978	39,850	37,325
Covered other real estate owned	52,552	88,273	88,895
Total other real estate owned	90,530	128,123	126,220
FDIC loss-share receivable	81,763	159,724	198,440
Premises and equipment, net	65,661	75,983	75,609
Intangible assets, net	1,972	3,040	3,404
Goodwill	956	956	956
Cash value of bank owned life insurance	49,095	15,603	50,087
Other assets	28,402	24,409	13,236
Total assets	2,818,502	3,019,052	2,949,383
Liabilities and Stockholders' Equity Liabilities	'	'	'
Noninterest-bearing	475,505	510,751	464,503
Interest-bearing	1,967,916	2,113,912	2,115,614
Total deposits	2,443,421	2,624,663	2,580,117
Securities sold under agreements to repurchase	20,255	50,120	17,404
Other borrowings	5,000	0	0
Other liabilities	17,201	22,983	10,387
Subordinated deferrable interest debentures	42,269	42,269	42,269
Total liabilities	2,528,146	2,740,035	2,650,177
Commitments and contingencies	'	'	'
Stockholders' Equity	'	'	'
Preferred stock, stated value $1,000; 5,000,000 shares authorized; 28,000, 28,000 and 52,000 shares issued and outstanding	27,938	27,662	51,207
Common stock, par value $1; 100,000,000 shares authorized; 25,270,851, 25,154,818 and 25,155,318 issued	25,271	25,155	25,155
Capital surplus	165,835	164,949	164,182
Retained earnings	83,025	65,710	62,156
Accumulated other comprehensive income (loss)	-531	6,607	7,337
Treasury stock, at cost, 1,363,342, 1,355,050 and 1,336,174 shares	-11,182	-11,066	-10,831
Total stockholders' equity	290,356	279,017	299,206
Total liabilities and stockholders' equity	$2,818,502	$3,019,052	$2,949,383

Consolidated_Balance_Sheets_Pa

Consolidated Balance Sheets (Parenthetical) (USD $)	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2012
Statement Of Financial Position [Abstract]	'	'	'
Preferred stock, stated value	$1,000	$1,000	$1,000
Preferred stock, shares authorized	5,000,000	5,000,000	5,000,000
Preferred stock, shares issued	28,000	28,000	52,000
Preferred stock, shares outstanding	28,000	28,000	52,000
Common stock, par value	$1	$1	$1
Common stock, shares authorized	100,000,000	100,000,000	100,000,000
Common stock, shares issued	25,270,851	25,154,818	25,155,318
Treasury stock, shares	1,363,342	1,355,050	1,336,174

Consolidated_Statements_of_Ear

Consolidated Statements of Earnings and Comprehensive Income (Loss) (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 income	'	'	'	'
Interest and fees on loans	$29,633	$29,165	$88,208	$88,981
Interest on taxable securities	1,720	2,017	5,136	6,513
Interest on nontaxable securities	352	365	1,071	1,104
Interest on deposits in other banks and federal funds sold	44	104	158	342
Total interest income	31,749	31,651	94,573	96,940
Interest expense	'	'	'	'
Interest on deposits	2,025	3,005	6,334	10,724
Interest on other borrowings	404	408	1,105	1,370
Total interest expense	2,429	3,413	7,439	12,094
Net interest income	29,320	28,238	87,134	84,846
Provision for loan losses	2,920	6,540	10,008	26,647
Net interest income after provision for loan losses	26,400	21,698	77,126	58,199
Noninterest income	'	'	'	'
Service charges on deposit accounts	4,948	5,121	14,480	14,277
Mortgage banking activity	5,232	3,740	14,697	8,221
Other service charges, commissions and fees	593	331	1,539	1,044
Gain on acquisitions	'	'	'	20,037
Gain (loss) on sale of securities	'	'	171	'
Other noninterest income	1,515	639	4,145	2,391
Total noninterest income	12,288	9,831	35,032	45,970
Noninterest expense	'	'	'	'
Salaries and employee benefits	14,412	13,766	41,599	37,337
Equipment and occupancy expenses	3,149	3,340	9,058	9,555
Amortization of intangible assets	346	364	1,068	996
Data processing and telecommunications expenses	3,072	2,599	8,478	7,429
Advertising and marketing expenses	434	421	1,016	1,134
Other noninterest expenses	7,336	8,320	23,102	33,228
Total noninterest expense	28,749	28,810	84,321	89,679
Income before income tax expense	9,939	2,719	27,837	14,490
Applicable income tax expense	3,262	816	9,197	4,727
Net income	6,677	1,903	18,640	9,763
Less preferred stock dividends	443	827	1,326	2,459
Net income available to common shareholders	6,234	1,076	17,314	7,304
Other comprehensive income (loss)	'	'	'	'
Unrealized holding gain (loss) arising during period on investment securities available for sale, net of tax	-4,007	-228	-8,125	1,017
Reclassification adjustment for losses (gains) included in earnings, net of tax	'	'	-111	'
Unrealized gain (loss) on cash flow hedges arising during period, net of tax	-106	-240	1,098	-976
Other comprehensive income (loss)	-4,113	-468	-7,138	41
Total comprehensive income	$2,121	$608	$10,176	$7,345
Basic earnings per share	$0.26	$0.05	$0.72	$0.31
Diluted earnings per share	$0.26	$0.04	$0.71	$0.30
Weighted average common shares outstanding	'	'	'	'
Basic	23,901	23,819	23,883	23,800
Diluted	24,316	23,973	24,298	23,954

Consolidated_Statements_of_Cha

Consolidated Statements of Changes in Stockholders' Equity (USD $)	Total	Preferred Stock [Member]	Common Stock [Member]	Capital Surplus [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income, Net of Tax [Member]	Treasury Stock [Member]
In Thousands, except Share data
Balance at beginning of period at Dec. 31, 2011	'	$50,727	$25,087	$166,639	$54,852	$7,296	($10,831)
Balance at beginning of period, Shares at Dec. 31, 2011	'	52,000	25,087,468	'	'	'	'
Repurchase of warrants	'	'	'	-2,670	'	'	'
Net income	9,763	'	'	'	9,763	'	'
Other comprehensive income (loss)	41	'	'	'	'	41	'
Issuance of restricted shares	'	'	67	-67	'	'	'
Stock-based compensation	'	'	'	278	'	'	'
Dividends on preferred shares	'	'	'	'	-1,979	'	'
Issuance of restricted shares, Shares	'	'	67,450	'	'	'	'
Accretion of fair value of warrant	'	480	'	'	-480	'	'
Accretion of fair value of warrant, Shares	'	'	'	'	'	'	'
Proceeds from exercise of stock options	'	'	1	2	'	'	'
Proceeds from exercise of stock options, Shares	'	'	400	'	'	'	'
Balance at end of period at Sep. 30, 2012	299,206	51,207	25,155	164,182	62,156	7,337	-10,831
Balance at end of period, Shares at Sep. 30, 2012	'	52,000	25,155,318	'	'	'	'
Balance at beginning of period at Dec. 31, 2012	279,017	27,662	25,155	164,949	65,710	6,607	-11,066
Balance at beginning of period, Shares at Dec. 31, 2012	'	28,000	25,154,818	'	'	'	'
Net income	18,640	'	'	'	18,640	'	'
Other comprehensive income (loss)	-7,138	'	'	'	'	-7,138	'
Purchase of treasury shares	'	'	'	'	'	'	-116
Issuance of restricted shares	'	'	83	-83	'	'	'
Stock-based compensation	'	'	'	592	'	'	'
Dividends on preferred shares	'	'	'	'	-275	'	'
Issuance of restricted shares, Shares	'	'	83,400	'	'	'	'
Cancellation of restricted shares	'	'	-1	1	'	'	'
Accretion of fair value of warrant	'	276	'	'	-1,050	'	'
Cancellation of restricted shares, Shares	'	'	-1,000	'	'	'	'
Accretion of fair value of warrant, Shares	'	'	'	'	'	'	'
Proceeds from exercise of stock options	'	'	34	376	'	'	'
Proceeds from exercise of stock options, Shares	'	'	33,633	'	'	'	'
Balance at end of period at Sep. 30, 2013	$290,356	$27,938	$25,271	$165,835	$83,025	($531)	($11,182)
Balance at end of period, Shares at Sep. 30, 2013	'	28,000	25,270,851	'	'	'	'

Consolidated_Statements_of_Cas

Consolidated Statements of Cash Flows (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012
Cash flows from operating activities:	'	'
Net income	$18,640	$9,763
Adjustments reconciling net income to net cash provided by operating activities:	'	'
Depreciation	3,683	3,585
Net (gains) losses on sale or disposal of premises and equipment	-61	163
Net losses or write-downs on sale of other real estate owned	5,646	9,048
Provision for loan losses	10,008	26,647
Gain on acquisitions	'	-20,037
Amortization of intangible assets	1,068	996
Net change in mortgage loans held for sale	-20,848	-17,458
Net gains on securities available for sale	-171	'
Change in other prepaids, deferrals and accruals, net	15,537	16,236
Net cash provided by operating activities	33,502	28,943
Cash flows from investing activities, net of effect of business combinations:	'	'
Net decrease in federal funds sold and interest-bearing deposits	119,778	162,170
Proceeds from maturities of securities available for sale	46,005	82,623
Purchase of securities available for sale	-61,445	-89,787
Proceeds from sales of securities available for sale	36,669	27,563
Purchase of bank owned life insurance	-30,000	-50,000
Net (increase) decrease in loans	-95,370	-53,660
Proceeds from sales of other real estate owned	55,270	57,443
Proceeds from sales of premises and equipment	1,889	409
Purchases of premises and equipment	-4,136	-6,642
Decrease in FDIC loss-share receivable	77,961	96,608
Net cash proceeds received from FDIC-assisted acquisitions	'	220,516
Net cash provided by investing activities	146,621	447,243
Cash flows from financing activities, net of effect of business combinations:	'	'
Net decrease in deposits	-181,242	-429,185
Net decrease in securities sold under agreements to repurchase	-29,865	-20,261
Proceeds from other borrowings	5,000	'
Decrease in other borrowings	'	-30,334
Dividends paid - preferred stock	-1,050	-1,979
Repurchase of warrants	'	-2,670
Purchase of treasury shares	-116	'
Proceeds from exercise of stock options	410	4
Net cash used in financing activities	-206,863	-484,425
Net change in cash and due from banks	-26,740	-8,239
Cash and due from banks at beginning of period	80,256	65,528
Cash and due from banks at end of period	53,516	57,289
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION	'	'
Interest	7,840	13,699
Income taxes	11,304	52
Loans transferred to other real estate owned	$37,054	$61,237

Basis_of_Presentation_and_Acco

Basis of Presentation and Accounting Policies	9 Months Ended
	Sep. 30, 2013
Accounting Policies [Abstract]	'
Basis of Presentation and Accounting Policies	'
	NOTE 1 – BASIS OF PRESENTATION AND ACCOUNTING POLICIES
	Ameris Bancorp (the “Company” or “Ameris”) is a financial holding company headquartered in Moultrie, Georgia. Ameris conducts substantially all of its operations through its wholly owned banking subsidiary, Ameris Bank (the “Bank”). At September 30, 2013, the Bank operated 57 branches in select markets in Georgia, Alabama, Florida and South Carolina. Our business model capitalizes on the efficiencies of a large financial services company while still providing the community with the personalized banking service expected by our customers. We manage our Bank through a balance of decentralized management responsibilities and efficient centralized operating systems, products and loan underwriting standards. The Company’s Board of Directors and senior managers establish corporate policy, strategy and administrative policies. Within the Company’s established guidelines and policies, the banker closest to the customer responds to the differing needs and demands of their unique market.
	The accompanying unaudited consolidated financial statements for Ameris have been prepared in accordance with accounting principles generally accepted in the United States of America for interim financial information and Regulation S-X. Accordingly, the financial statements do not include all of the information and footnotes required by accounting principles generally accepted in the United States of America for complete financial statement presentation. The interim consolidated financial statements included herein are unaudited, but reflect all adjustments which, in the opinion of management, are necessary for a fair presentation of the consolidated financial position and results of operations for the interim periods presented. All significant intercompany accounts and transactions have been eliminated in consolidation. The results of operations for the period ended September 30, 2013 are not necessarily indicative of the results to be expected for the full year. These financial statements should be read in conjunction with the financial statements and notes thereto and the report of our registered independent public accounting firm included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2012.
	Newly Adopted Accounting Pronouncements
	ASU 2013-11 – Presentation of an Unrecognized Tax Benefit When a Net Operating Loss Carryforward, a Similar Tax Loss, or a Tax Credit Carryforward Exists (“ASU 2013-11”). ASU 2013-11 requires that an unrecognized tax benefit, or a portion of an unrecognized tax benefit, be presented in the financial statements as a reduction to a deferred tax asset for a net operating loss carryforward, a similar tax loss or a tax credit carryforward. However, if a net operating loss carryforward, a similar tax loss or a tax credit carryforward is not available at the reporting date under the tax law of the applicable jurisdiction to settle any additional income taxes that would result from the disallowance of a tax position or the tax law of the applicable jurisdiction does not require the entity to use, and the entity does not intend to use, the deferred tax asset for such purpose, the unrecognized tax benefit should be presented in the financial statements as a liability and should not be combined with deferred tax assets. The amendments are effective for fiscal years, and interim periods within those years, beginning after December 15, 2013. The amendments are not expected to have a material impact on the Company’s results of operations, financial position or disclosures.
	ASU 2013-02 – Reporting of Amounts Reclassified Out of Accumulated Other Comprehensive Income (“ASU 2013-02”). ASU 2013-02 requires an entity to provide information about the amounts reclassified from accumulated other comprehensive income by component. In addition, an entity is required to present, either on the face of the statement where net income is presented or in the notes, significant amounts reclassified out of accumulated other comprehensive income by the respective line items of net income but only if the amount reclassified is required under United States generally accepted accounting principles to be reclassified to net income in its entirety in the same reporting period. For all other amounts, an entity is required to cross-reference to other disclosures that provide additional details about these amounts. The amendments are effective prospectively for reporting periods beginning after December 15, 2012. It did not have a material effect on the Company’s results of operations, financial position or disclosures.
	ASU 2012-06 – 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”). When an entity recognizes an indemnification asset and subsequently a change in the cash flows expected to be collected on the indemnification asset occurs as a result of a change in the cash flows expected to be collected on the indemnified asset, ASU 2012-06 requires the entity to recognize the change in the measurement of the indemnification asset on the same basis as the indemnified assets. Any amortization of changes in value of the indemnification asset should be limited to the lesser of the term of the indemnification agreement and the remaining life of the indemnified assets. ASU 2012-06 is effective for fiscal years beginning on or after December 15, 2012, and early adoption is permitted. It is to be applied prospectively to any new indemnification assets acquired after the date of adoption and to indemnification assets existing as of the date of adoption arising from a government-assisted acquisition of a financial institution. ASU 2012-06 did not have a material effect on the Company’s results of operations, financial position or disclosures.
	ASU 2011-04 – Amendments to Achieve Common Fair Value Measurement and Disclosure Requirements in U.S. GAAP and IFRSs (“ASU 2011-04”). ASU 2011-04 generally represents clarifications of Topic 820, but also includes some instances where a particular principle or requirement for measuring fair value or disclosing information about fair value measurements has changed. ASU 2011-04 results in common principles and requirements for measuring fair value and for disclosing information about fair value measurements. ASU 2011-04 was to be applied prospectively and is effective during interim and annual periods beginning after December 15, 2011 for public companies. It did not have a material impact on the Company’s results of operations, financial position or disclosures.
	ASU 2011-05 – Amendments to Topic 220, Comprehensive Income (“ASU 2011-05”). ASU 2011-05 grants an entity the option to present the total of comprehensive income, the components of net income and the components of other comprehensive income either in a single continuous statement of comprehensive income or in two separate but consecutive statements. In both choices, an entity is required to present each component of net income along with total net income, each component of other comprehensive income along with a total for other comprehensive income and a total amount for comprehensive income. ASU 2011-05 eliminates the option to present the components of other comprehensive income as part of the statement of changes in stockholders’ equity. ASU 2011-05 does not change the items that must be reported in other comprehensive income or when an item of other comprehensive income must be reclassified to net income. For public entities, ASU 2011-05 was effective for fiscal years, and interim periods within those years, beginning after December 15, 2011, and was to be adopted retrospectively. It did not have a material impact on the Company’s results of operations, financial position or disclosures.
	ASU 2011-08 – Intangibles – Goodwill and Other (Topic 350) Testing Goodwill for Impairment (“ASU 2011-08”). ASU 2011-08 grants an entity the option to assess qualitative factors to determine whether it is more likely than not that the fair value of a reporting unit is less than its carrying amount. This conclusion can be used as a basis for determining whether it is necessary to perform the two-step goodwill impairment test required in Topic 350. ASU 2011-08 was effective for annual and interim goodwill impairment tests performed for fiscal years beginning after December 15, 2011. It did not have a material impact on the Company’s results of operations, financial position or disclosures.
	Fair Value of Financial Instruments
	The fair value of a financial instrument is the current amount that would be exchanged between willing parties, other than in a forced liquidation. Fair value is best determined based upon quoted market prices. However, in many instances, there are no quoted market prices for the Company’s various financial instruments. In cases where quoted market prices are not available, fair value is based on discounted cash flows or other valuation techniques. These techniques are significantly affected by the assumptions used, including the discount rate and estimates of future cash flows. Accordingly, the fair value estimates may not be realized in an immediate settlement of the instrument. The accounting standard for disclosures about the fair value of financial instruments excludes certain financial instruments and all nonfinancial instruments from its disclosure requirements. Accordingly, the aggregate fair value amounts presented may not necessarily represent the underlying fair value of the Company.
	The Company has elected to record mortgage loans held-for-sale at fair value in order to eliminate the complexities and inherent difficulties of achieving hedge accounting and to better align reported results with the underlying economic changes in value of the loans and related hedge instruments. This election impacts the timing and recognition of origination fees and costs, as well as servicing value, which are now recognized in earnings at the time of origination. Interest income on mortgage loans held-for-sale is recorded on an accrual basis in the consolidated statement of income under the heading “Interest income – interest and fees on loans”. The servicing value is included in the fair value of the Interest Rate Lock Commitments with borrowers. The mark to market adjustments related to loans held-for-sale and the associated economic hedges are captured in mortgage banking activities.
	The fair value hierarchy describes three levels of inputs that may be used to measure fair value:
	Level 1 – Quoted prices in active markets for identical assets or liabilities.
	Level 2 – Observable inputs other than Level 1 prices, such as quoted prices for similar assets or liabilities; quoted prices in markets that are not active; or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities.
	Level 3 – Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities.
	The following methods and assumptions were used by the Company in estimating the fair value of its financial instruments and other accounts recorded based on their fair value:
	Cash and Due From Banks, Federal Funds Sold and Interest-Bearing Accounts: The carrying amount of cash and due from banks, federal funds sold and interest-bearing accounts approximates fair value.
	Investment Securities Available for Sale: The fair value of securities available for sale is determined by various valuation methodologies. Where quoted market prices are available in an active market, securities are classified within Level 1 of the valuation hierarchy. If quoted market prices are not available, then fair values are estimated by using pricing models, quoted prices of securities with similar characteristics, or discounted cash flows. Level 2 securities include mortgage-backed securities issued by government sponsored enterprises and municipal bonds. The level 2 fair value pricing is provided by an independent third-party and is based upon similar securities in an active market. In certain cases where Level 1 or Level 2 inputs are not available, securities are classified within Level 3 of the hierarchy and include certain residual municipal securities and other less liquid securities.
	Other Investments: Federal Home Loan Bank (“FHLB”) stock is included in other investments at its original cost basis, as cost approximates fair value and there is no ready market for such investments.
	Mortgage Loans Held for Sale: The fair value of mortgage loans held for sale is determined on outstanding commitments from third party investors in the secondary markets and is classified within Level 2 of the valuation hierarchy.
	Loans: The carrying amount of variable-rate loans that reprice frequently and have no significant change in credit risk approximates fair value. The fair value of fixed-rate loans is estimated based on discounted contractual cash flows, using interest rates currently being offered for loans with similar terms to borrowers with similar credit quality. The fair value of impaired loans is estimated based on discounted expected future cash flows or underlying collateral values, where applicable. A loan is determined to be impaired if the Company believes it is probable that all principal and interest amounts due according to the terms of the loan will not be collected as scheduled. The fair value of impaired loans is determined in accordance with accounting standards and generally results in a specific reserve established through a charge to the provision for loan losses. Losses on impaired loans are charged to the allowance when management believes the uncollectability of a loan is confirmed. Management has determined that the majority of impaired loans are Level 3 assets due to the extensive use of market appraisals. To the extent that market appraisals or other methods do not produce reliable determinations of fair value, these assets are deemed to be Level 3.
	Other Real Estate Owned: The fair value of other real estate owned (“OREO”) is determined using certified appraisals that value the property at its highest and best uses by applying traditional valuation methods common to the industry. The Company does not hold any OREO for profit purposes and all other real estate is actively marketed for sale. In most cases, management has determined that additional write-downs are required beyond what is calculable from the appraisal to carry the property at levels that would attract buyers. Because this additional write-down is not based on observable inputs, management has determined that other real estate owned should be classified as Level 3.
	Covered Assets: Covered assets include loans and other real estate owned on which the majority of losses would be covered by loss-sharing agreements with the Federal Deposit Insurance Corporation (the “FDIC”). Management initially valued these assets at fair value using mostly unobservable inputs and, as such, has classified these assets as Level 3.
	Intangible Assets and Goodwill: Intangible assets consist of core deposit premiums acquired in connection with business combinations and are based on the established value of acquired customer deposits. The core deposit premium is initially recognized based on a valuation performed as of the consummation date and is amortized over an estimated useful life of three to ten years. Goodwill represents the excess of the purchase price over the fair value of the net identifiable assets acquired in a business combination. Goodwill and other intangible assets deemed to have an indefinite useful life are not amortized but instead are subject to an annual review for impairment.
	FDIC Loss-Share Receivable: Because the FDIC will reimburse the Company for certain acquired loans should the Company experience a loss, an indemnification asset is recorded at fair value at the acquisition date. The indemnification asset is recognized at the same time as the indemnified loans and measured on the same basis, subject to collectability or contractual limitations. The shared-loss agreements on the acquisition date reflect the reimbursements expected to be received from the FDIC, using an appropriate discount rate which reflects counterparty credit risk and other uncertainties. The shared-loss agreements continue to be measured on the same basis as the related indemnified loans, and the loss-share receivable is impacted by changes in estimated cash flows associated with these loans.
	Deposits: The carrying amount of demand deposits, savings deposits and variable-rate certificates of deposit approximates fair value. The fair value of fixed-rate certificates of deposit is estimated based on discounted contractual cash flows using interest rates currently offered for certificates with similar maturities.
	Securities Sold under Agreements to Repurchase and Other Borrowings: The carrying amount of variable rate borrowings and securities sold under repurchase agreements approximates fair value. The fair value of fixed rate other borrowings is estimated based on discounted contractual cash flows using the current incremental borrowing rates for similar borrowing arrangements.
	Subordinated Deferrable Interest Debentures: The carrying amount of the Company’s variable rate trust preferred securities approximates fair value.
	Off-Balance-Sheet Instruments: Because commitments to extend credit and standby letters of credit are typically made using variable rates and have short maturities, the carrying value and fair value are immaterial for disclosure.
	Derivatives: The Company has entered into derivative financial instruments to manage interest rate risk. The valuation of these instruments is determined using widely accepted valuation techniques including discounted cash flow analysis on the expected cash flows of the derivatives. This analysis reflects the contractual terms of the derivative, including the period to maturity, and uses observable market-based inputs, including interest rate curves and implied volatilities. The fair value of the derivatives are determined using the market standard methodology of netting the discounted future fixed cash receipts and the discounted expected variable cash payments. The variable cash payments are based on an expectation of future interest rates (forward curves derived from observable market interest rate curves).
	The Company incorporates credit valuation adjustments to appropriately reflect both its own nonperformance risk and the respective counterparty’s nonperformance risk in the fair value measurements. In adjusting the fair value of its derivative contracts for the effect of nonperformance risk, the Company has considered the impact of netting any applicable credit enhancements such as collateral postings, thresholds, mutual puts and guarantees.
	Although the Company has determined that the majority of the inputs used to value its derivative fall within Level 2 of the fair value hierarchy, the credit valuation adjustments associated with its derivatives utilize Level 3 inputs, such as estimates of current credit spreads to evaluate the likelihood of default by itself or the counterparty. However, as of September 30, 2013, December 31, 2012 and September 30, 2012, the Company has assessed the significance of the impact of the credit valuation adjustments on the overall valuation of its derivative positions and has determined that the credit valuation adjustment is not significant to the overall valuation of its derivatives. As a result, the Company has determined that its derivative valuation in its entirety is classified in Level 2 of the fair value hierarchy.
	The carrying amount and estimated fair value of the Company’s financial instruments, not shown elsewhere in these financial statements, were as follows:
				Fair Value Measurements at
				September 30, 2013 Using:
		Carrying		Level 1			Level 2			Level 3			Total
		Amount
		(Dollars in Thousands)
	Financial assets:
	Loans, net	$	1,983,062	$	—		$	1,561,480		$	461,213		$	2,022,693
	Financial liabilities:
	Deposits		2,443,421		—			2,444,244			—			2,444,244
				Fair Value Measurements at
				December 31, 2012 Using:
		Carrying		Level 1			Level 2			Level 3			Total
		Amount
		(Dollars in Thousands)
	Financial assets:
	Loans, net	$	1,934,754	$	—		$	1,406,366		$	560,226		$	1,966,592
	Financial liabilities:
	Deposits		2,624,663		—			2,624,883			—			2,624,883
				Fair Value Measurements at
				September 30, 2012 Using:
		Carrying		Level 1			Level 2			Level 3			Total
		Amount
		(Dollars in Thousands)
	Financial assets:
	Loans, net	$	1,960,195	$	—		$	1,393,115		$	596,671		$	1,989,786
	Financial liabilities:
	Deposits		2,580,117		—			2,581,465			—			2,581,465
	The following table presents the fair value measurements of assets and liabilities measured at fair value on a recurring basis and the level within the fair value hierarchy in which the fair value measurements fall as of September 30, 2013, December 31, 2012 and September 30, 2012 (dollars in thousands):
	Fair Value Measurements on a Recurring Basis
	As of September 30, 2013
	Fair Value		Quoted Prices			Significant			Significant
			in Active			Other			Unobservable
			Markets for			Observable			Inputs
			Identical			Inputs			(Level 3)
			Assets			(Level 2)
			(Level 1)
U.S. government agencies	$	13,917	$	—		$	13,917		$	—
State, county and municipal securities		112,939		4,460			108,479			—
Corporate debt securities		9,738		—			7,738			2,000
Mortgage-backed securities		175,654		9,375			166,279			—
Mortgage loans held for sale		69,634		—			69,634			—
Total recurring assets at fair value	$	381,882	$	13,835		$	366,047		$	2,000
Derivative financial instruments	$	972	$	—		$	972		$	—
Total recurring liabilities at fair value	$	972	$	—		$	972		$	—
	Fair Value Measurements on a Recurring Basis
	As of December 31, 2012
	Fair Value		Quoted Prices			Significant			Significant
			in Active			Other			Unobservable
			Markets for			Observable			Inputs
			Identical			Inputs			(Level 3)
			Assets			(Level 2)
			(Level 1)
U.S. government agencies	$	6,870	$	—		$	6,870		$	—
State, county and municipal securities		114,390		4,854			109,536			—
Corporate debt securities		10,328		—			8,328			2,000
Mortgage-backed securities		215,321		23,893			191,428			—
Mortgage loans held for sale		48,786		—			48,786			—
Total recurring assets at fair value	$	395,695	$	28,747		$	364,948		$	2,000
Derivative financial instruments	$	2,978	$	—		$	2,978		$	—
Total recurring liabilities at fair value	$	2,978	$	—		$	2,978		$	—
	Fair Value Measurements on a Recurring Basis
	As of September 30, 2012
	Fair Value		Quoted Prices			Significant			Significant
			in Active			Other			Unobservable
			Markets for			Observable			Inputs
			Identical			Inputs			(Level 3)
			Assets			(Level 2)
			(Level 1)
U.S. government agencies	$	8,895	$	—		$	8,895		$	—
State, county and municipal securities		111,742		6,932			104,810			—
Corporate debt securities		11,495		—			9,495			2,000
Mortgage-backed securities		228,919		1,965			226,954			—
Mortgage loans held for sale		29,021		—			29,021			—
Total recurring assets at fair value	$	390,072	$	8,897		$	379,175		$	2,000
Derivative financial instruments	$	3,233	$	—		$	3,233		$	—
Total recurring liabilities at fair value	$	3,233	$	—		$	3,233		$	—
The following table is a presentation of the valuation methodologies used for instruments measured at fair value on a nonrecurring basis, as well as the general classification of such instruments pursuant to the valuation hierarchy as of September 30, 2013, December 31, 2012 and September 30, 2012 (dollars in thousands):
	Fair Value Measurements on a Nonrecurring Basis
	As of September 30, 2013
	Fair Value		Level 1			Level 2			Level 3
Impaired loans carried at fair value	$	43,564	$	—		$	—		$	43,564
Other real estate owned		37,978		—			—			37,978
Covered loans		417,649		—			—			417,649
Covered other real estate owned		52,552		—			—			52,552
Total non-recurring assets at fair value	$	551,743	$	—		$	—		$	551,743
	Fair Value Measurements on a Nonrecurring Basis
	As of December 31, 2012
	Fair Value		Level 1			Level 2			Level 3
Impaired loans carried at fair value	$	52,514	$	—		$	—		$	52,514
Other real estate owned		39,850		—			—			39,850
Covered loans		507,712		—			—			507,712
Covered other real estate owned		88,273		—			—			88,273
Total nonrecurring assets at fair value	$	688,349	$	—		$	—		$	688,349
	Fair Value Measurements on a Nonrecurring Basis
	As of September 30, 2012
	Fair Value		Level 1			Level 2			Level 3
Impaired loans carried at fair value	$	50,437	$	—		$	—		$	50,437
Other real estate owned		37,325		—			—			37,325
Covered loans		546,234		—			—			546,234
Covered other real estate owned		88,895		—			—			88,895
Total nonrecurring assets at fair value	$	722,891	$	—		$	—		$	722,891
The inputs used to determine estimated fair value of impaired loans and covered loans include market conditions, loan term, underlying collateral characteristics and discount rates. The inputs used to determine fair value of other real estate owned and covered other real estate owned include market conditions, estimated marketing period or holding period, underlying collateral characteristics and discount rates.
For the nine months ended September 30, 2013 and 2012, there was not a change in the methods and significant assumptions used to estimate fair value.
The following table shows significant unobservable inputs used in the fair value measurement of Level 3 assets and liabilities.
Measurements	Fair Value at		Valuation Technique		Unobservable Inputs	Range
	September 30, 2013
(Dollars in Thousands)
Nonrecurring:
Impaired loans	$	43,564	Third party appraisals and		Collateral discounts and	4.00% - 75.00%
			discounted cash flows		discount rates
Other real estate owned		37,978	Third party appraisals		Collateral discounts and	10.00% - 78.00%
					estimated costs to sell
Covered loans		417,649	Third party appraisals and		Collateral discounts	1.75% - 75.00%
			discounted cash flows		Discount rate
Covered real estate owned		52,552	Third party appraisals		Collateral discounts and	10.00% - 84.00%
					estimated costs to sell
Recurring:
Investment securities available for sale		2,000	Discounted par values		Credit quality of	0.00%
					underlying issuer
The transfers between the fair value hierarchy levels during the nine months ended September 30, 2013 and 2012 involved the transferring of loans to impaired loans, impaired loans to other real estate owned and covered loans to covered other real estate owned. These transfers are reflected in Ameris’ reconciliation of Level 3 assets below.
	Investment		Impaired			Other Real			Covered			Covered
	Securities		Loans			Estate			Loans			Other
	Available		Carried at			Owned						Real Estate
	for		Fair Value									Owned
	Sale
	(Dollars in Thousands)
Beginning balance, January 1, 2013	$	2,000	$	52,514		$	39,850		$	507,712		$	88,273
Total gains/(losses) included in net income		—		—			(2,214	)		—			(3,432	)
Purchases, sales, issuances, and settlements, net		—		(621	)		(7,987	)		(61,338	)		(61,014	)
Transfers in to Level 3		—		—			—			—			—
Asset reclassification, within Level 3		—		(8,329	)		8,329			(28,725	)		28,725
Ending balance September 30, 2013	$	2,000	$	43,564		$	37,978		$	417,649		$	52,552
	Investment		Impaired			Other Real			Covered			Covered
	Securities		Loans			Estate			Loans			Other
	Available		Carried at			Owned						Real Estate
	for		Fair Value									Owned
	Sale
	(Dollars in Thousands)
Beginning balance, January 1, 2012	$	2,000	$	70,296		$	46,680		$	571,489		$	78,617
Total gains/(losses) included in net income		—		—			(9,048	)		—			—
Purchases, sales, issuances, and settlements, net		—		—			(21,008	)		15,281			(30,258	)
Transfers in to Level 3		—		842			—			—			—
Asset reclassification, within Level 3		—		(20,701	)		20,701			(40,536	)		40,536
Ending balance September 30, 2012	$	2,000	$	50,437		$	37,325		$	546,234		$	88,895

Pending_Merger_and_Acquisition

Pending Merger and Acquisition	9 Months Ended
	Sep. 30, 2013
Business Combinations [Abstract]	'
Pending Merger and Acquisition	'
	NOTE 2 – PENDING MERGER AND ACQUISITION
	On May 1, 2013, the Company entered into an Agreement and Plan of Merger (the “Merger Agreement”) with The Prosperity Banking Company (“Prosperity”), a bank holding company headquartered in Saint Augustine, Florida. Prosperity Bank is a wholly owned bank subsidiary of Prosperity. Prosperity Bank has a total of 12 banking locations, with the majority of the franchise concentrated in northeast Florida. As of June 30, 2013, Prosperity reported assets of $754 million, loans of $485 million and deposits of $493 million. Under the terms of the Merger Agreement, Prosperity will merge with and into Ameris, with Ameris as the surviving entity in the merger. In addition, Prosperity Bank will be merged with and into the Bank, with the Bank as the surviving entity.
	Pursuant to the terms of the Merger Agreement, Prosperity shareholders will have the option to elect to receive either 3.125 shares of the Company’s common stock or $41.50 in cash for each share of Prosperity common stock they hold, subject to the requirement that no more than 50% of the outstanding shares of Prosperity may receive cash. Assuming 100% stock consideration, the transaction would be valued at approximately $15.7 million, based on the Company’s closing stock price of $13.32 on May 1, 2013 and Prosperity’s common shares outstanding of 377,960 as of that date.
	Consummation of the merger is subject to customary conditions, including, among others, approval of the Merger Agreement by Prosperity’s shareholders and the receipt of required regulatory approvals. The transaction is expected to close during the fourth quarter of 2013.

Investment_Securities

Investment Securities	9 Months Ended
	Sep. 30, 2013
Investments Debt And Equity Securities [Abstract]	'
Investment Securities	'
	NOTE 3 – INVESTMENT SECURITIES
	The Company’s investment policy blends the Company’s liquidity needs and interest rate risk management with its desire to increase income and provide funds for expected growth in loans. The investment securities portfolio consists primarily of U.S. government sponsored mortgage-backed securities and agencies, state, county and municipal securities and corporate debt securities. The Company’s portfolio and investing philosophy concentrate activities in obligations where the credit risk is limited. For the small portion of the Company’s portfolio found to present credit risk, the Company has reviewed the investments and financial performance of the obligors and believes the credit risk to be acceptable.
	The amortized cost and estimated fair value of investment securities available for sale at September 30, 2013, December 31, 2012 and September 30, 2012 are presented below:
		Amortized		Gross			Gross			Fair
		Cost		Unrealized			Unrealized			Value
				Gains			Losses
		(Dollars in Thousands)
	September 30, 2013:
	U. S. government agencies	$	14,945	$	—		$	(1,028	)	$	13,917
	State, county and municipal securities		112,643		2,331			(2,035	)		112,939
	Corporate debt securities		10,314		280			(856	)		9,738
	Mortgage-backed securities		176,818		2,714			(3,878	)		175,654
	Total securities	$	314,720	$	5,325		$	(7,797	)	$	312,248
	December 31, 2012:
	U. S. government agencies	$	6,605	$	271		$	(6	)	$	6,870
	State, county and municipal securities		109,736		4,864			(210	)		114,390
	Corporate debt securities		10,545		330			(547	)		10,328
	Mortgage-backed securities		209,824		5,701			(204	)		215,321
	Total securities	$	336,710	$	11,166		$	(967	)	$	346,909
	September 30, 2012:
	U. S. government agencies	$	8,606	$	289		$	—		$	8,895
	State, county and municipal securities		106,541		5,345			(144	)		111,742
	Corporate debt securities		11,793		262			(560	)		11,495
	Mortgage-backed securities		222,641		6,562			(284	)		228,919
	Total securities	$	349,581	$	12,458		$	(988	)	$	361,051
	The amortized cost and fair value of available-for-sale securities at September 30, 2013 by contractual maturity are summarized in the table below. Expected maturities for mortgage-backed securities may differ from contractual maturities because in certain cases borrowers can prepay obligations without prepayment penalties. Therefore, these securities are not included in the following maturity summary:
		Amortized		Fair
		Cost		Value
		(Dollars in Thousands)
	Due in one year or less	$	2,214	$	2,229
	Due from one year to five years		36,699		37,826
	Due from five to ten years		68,790		67,622
	Due after ten years		30,199		28,917
	Mortgage-backed securities		176,818		175,654
		$	314,720	$	312,248
	Securities with a carrying value of approximately $217.3 million serve as collateral to secure public deposits and other purposes required or permitted by law at September 30, 2013.
	The following table details the gross unrealized losses and fair value of securities aggregated by category and duration of continuous unrealized loss position at September 30, 2013, December 31, 2012 and September 30, 2012.
		Less Than 12 Months					12 Months or More						Total
	Description of Securities	Fair		Unrealized			Fair			Unrealized			Fair		Unrealized
		Value		Losses			Value			Losses			Value		Losses
		(Dollars in Thousands)
	September 30, 2013:
	U. S. government agencies	$	13,917	$	(1,028	)	$	—		$	—		$	13,917	$	(1,028	)
	State, county and municipal securities		46,516		(1,735	)		3,807			(300	)		50,323		(2,035	)
	Corporate debt securities		—		—			4,235			(856	)		4,235		(856	)
	Mortgage-backed securities		90,639		(3,878	)		—			—			90,639		(3,878	)
	Total temporarily impaired securities	$	151,072	$	(6,641	)	$	8,042		$	(1,156	)	$	159,114	$	(7,797	)
	December 31, 2012:
	U. S. government agencies	$	4,994	$	(6	)	$	—		$	—		$	4,994	$	(6	)
	State, county and municipal securities		15,595		(199	)		505			(11	)		16,100		(210	)
	Corporate debt securities		—		—			4,560			(547	)		4,560		(547	)
	Mortgage-backed securities		23,951		(181	)		3,617			(23	)		27,568		(204	)
	Total temporarily impaired securities	$	44,540	$	(386	)	$	8,682		$	(581	)	$	53,222	$	(967	)
	September 30, 2012:
	U. S. government agencies	$	—	$	—		$	—		$	—		$	—	$	—
	State, county and municipal securities		14,653		(132	)		505			(12	)		15,158		(144	)
	Corporate debt securities		—		—			5,551			(560	)		5,551		(560	)
	Mortgage-backed securities		32,660		(267	)		3,434			(17	)		36,094		(284	)
	Total temporarily impaired securities	$	47,313	$	(399	)	$	9,490		$	(589	)	$	56,803	$	(988	)

Loans

Loans	9 Months Ended
	Sep. 30, 2013
Receivables [Abstract]	'
Loans	'
	NOTE 4 – LOANS
	The Company engages in a full complement of lending activities, including real estate-related loans, agriculture-related loans, commercial and financial loans and consumer installment loans within select markets in Georgia, Alabama, Florida and South Carolina. Ameris concentrates the majority of its lending activities in real estate loans. While risk of loss in the Company’s portfolio is primarily tied to the credit quality of the various borrowers, risk of loss may increase due to factors beyond the Company’s control, such as local, regional and/or national economic downturns. General conditions in the real estate market may also impact the relative risk in the real estate portfolio.
	Commercial, financial and agricultural loans include both secured and unsecured loans for working capital, expansion, crop production, and other business purposes. Short-term working capital loans are secured by non-real estate collateral such as accounts receivable, crops, inventory and equipment. The Company evaluates the financial strength, cash flow, management, credit history of the borrower and the quality of the collateral securing the loan. The Bank often requires personal guarantees and secondary sources of repayment on commercial, financial and agricultural loans.
	Real estate loans include construction and development loans, commercial and farmland loans and residential loans. Construction and development loans include loans for the development of residential neighborhoods, construction of one-to-four family residential construction loans to builders and consumers, and commercial real estate construction loans, primarily for owner-occupied properties. The Company limits its construction lending risk through adherence to established underwriting procedures. Commercial real estate loans include loans secured by owner-occupied commercial buildings for office, storage, retail, farmland and warehouse space. They also include non-owner occupied commercial buildings such as leased retail and office space. Commercial real estate loans may be larger in size and may involve a greater degree of risk than one-to-four family residential mortgage loans. Payments on such loans are often dependent on successful operation or management of the properties. The Company’s residential loans represent permanent mortgage financing and are secured by residential properties located within the Bank’s market areas.
	Consumer installment loans and other loans include automobile loans, boat and recreational vehicle financing, and both secured and unsecured personal loans. Consumer loans carry greater risks than other loans, as the collateral can consist of rapidly depreciating assets such as automobiles and equipment that may not provide an adequate source of repayment of the loan in the case of default.
	Loans are stated at unpaid balances, net of unearned income and deferred loan fees. Balances within the major loans receivable categories are presented in the following table:
	(Dollars in Thousands)	September 30,				December 31,			September 30,
		2013				2012			2012
	Commercial, financial and agricultural	$	244,991			$	174,217		$	189,374
	Real estate – construction and development		132,277				114,199			125,315
	Real estate – commercial and farmland		799,149				732,322			713,240
	Real estate – residential		355,920				346,480			343,332
	Consumer installment		36,303				40,178			43,441
	Other		20,627				43,239			25,160
		$	1,589,267			$	1,450,635		$	1,439,862
	Covered loans are defined as loans that were acquired in FDIC-assisted transactions that are covered by a loss-sharing agreement with the FDIC. Covered loans totaling $417.6 million, $507.7 million and $546.2 million at September 30, 2013, December 31, 2012 and September 30, 2012, respectively, are not included in the above schedule.
	Covered loans are shown below according to loan type as of the end of the periods shown:
	(Dollars in Thousands)	September 30,				December 31,			September 30,
		2013				2012			2012
	Commercial, financial and agricultural	$	27,768			$	32,606		$	37,167
	Real estate – construction and development		50,702				70,184			73,356
	Real estate – commercial and farmland		237,086				278,506			298,903
	Real estate – residential		101,146				125,056			135,154
	Consumer installment		947				1,360			1,654
		$	417,649			$	507,712		$	546,234
	Nonaccrual and Past Due Loans
	A loan is placed on nonaccrual status when, in management’s judgment, the collection of the interest income appears doubtful. Interest receivable that has been accrued and is subsequently determined to have doubtful collectability is charged to interest income. Interest on loans that are classified as non-accrual is recognized when received. Past due loans are loans whose principal or interest is past due 90 days or more. In some cases, where borrowers are experiencing financial difficulties, loans may be restructured to provide terms significantly different from the original contractual terms.
	The following table presents an analysis of non-covered loans accounted for on a nonaccrual basis:
	(Dollars in Thousands)	September 30,				December 31,			September 30,
		2013				2012			2012
	Commercial, financial and agricultural	$	4,198			$	4,138		$	4,285
	Real estate – construction and development		4,229				9,281			8,201
	Real estate – commercial and farmland		9,548				11,962			11,408
	Real estate – residential		13,303				12,595			13,236
	Consumer installment		442				909			1,095
		$	31,720			$	38,885		$	38,225
	The following table presents an analysis of covered loans accounted for on a nonaccrual basis:
	(Dollars in Thousands)	September 30,				December 31,			September 30,
		2013				2012			2012
	Commercial, financial and agricultural	$	7,872			$	10,765		$	11,938
	Real estate – construction and development		16,582				20,027			21,971
	Real estate – commercial and farmland		37,079				55,946			58,377
	Real estate – residential		13,028				28,672			31,189
	Consumer installment		350				302			426
		$	74,911			$	115,712		$	123,901
	The following table presents an aging analysis of non-covered loans as of September 30, 2013, December 31, 2012 and September 30, 2012.
		Loans				Loans			Loans 90			Total			Current			Total			Loans 90
		30-59				60-89			or More			Loans			Loans			Loans			Days or
		Days Past				Days			Days Past			Past Due									More Past
		Due				Past Due			Due												Due and
																					Still
																					Accruing
		(Dollars in Thousands)
	As of September 30, 2013:
	Commercial, financial & agricultural	$	623			$	297		$	4,107		$	5,027		$	239,964		$	244,991		$	—
	Real estate – construction & development		1,200				794			4,229			6,223			126,054			132,277			—
	Real estate – commercial & farmland		3,883				2,458			9,523			15,864			783,285			799,149			—
	Real estate – residential		5,515				3,531			11,818			20,864			335,056			355,920			—
	Consumer installment loans		497				255			327			1,079			35,224			36,303			—
	Other		—				—			—			—			20,627			20,627			—
	Total	$	11,718			$	7,335		$	30,004		$	49,057		$	1,540,210		$	1,589,267		$	—
		Loans				Loans			Loans 90			Total			Current			Total			Loans 90
		30-59				60-89			or More			Loans			Loans			Loans			Days or
Days Past		Days				Days Past			Past Due									More Past
Due		Past Due				Due												Due and
																		Still
																		Accruing
	(Dollars in Thousands)
As of December 30, 2012:
Commercial, financial & agricultural	$	258			$	312		$	3,969		$	4,539		$	169,678		$	174,217		$	—
Real estate – construction & development		347				332			8,969			9,648			104,551			114,199			—
Real estate – commercial & farmland		2,867				2,296			9,544			14,707			717,615			732,322			—
Real estate – residential		7,651				2,766			10,990			21,407			325,073			346,480			—
Consumer installment loans		702				391			815			1,908			38,270			40,178			—
Other		—				—			—			—			43,239			43,239			—
Total	$	11,825			$	6,097		$	34,287		$	52,209		$	1,398,426		$	1,450,635		$	—
	Loans				Loans			Loans 90			Total			Current			Total			Loans 90
	30-59				60-89			or More			Loans			Loans			Loans			Days or
	Days Past				Days			Days Past			Past Due									More Past
	Due				Past Due			Due												Due and
																				Still
																				Accruing
	(Dollars in Thousands)
As of September 30, 2012:
Commercial, financial & agricultural	$	1,192			$	639		$	3,786		$	5,617		$	183,757		$	189,374		$	—
Real estate – construction & development		518				152			8,180			8,850			116,465			125,315			—
Real estate – commercial & farmland		3,507				812			11,402			15,721			697,519			713,240			—
Real estate – residential		7,200				2,346			12,372			21,918			321,414			343,332			—
Consumer installment loans		687				284			993			1,964			41,477			43,441			—
Other		—				—			—			—			25,160			25,160			—
Total	$	13,104			$	4,233		$	36,733		$	54,070		$	1,385,792		$	1,439,862		$	—
The following table presents an aging analysis of covered loans as of September 30, 2013, December 31, 2012 and September 30, 2012.
	Loans				Loans			Loans 90			Total			Current			Total			Loans 90
	30-59				60-89			or More			Loans			Loans			Loans			Days or
	Days Past				Days			Days Past			Past Due									More Past
	Due				Past Due			Due												Due and
																				Still
																				Accruing
	(Dollars in Thousands)
As of September 30, 2013:
Commercial, financial & agricultural	$	319			$	50		$	6,695		$	7,064		$	20,704		$	27,768		$	—
Real estate – construction & development		2,831				658			15,781			19,270			31,432			50,702			266
Real estate – commercial & farmland		7,365				5,350			30,503			43,218			193,868			237,086			568
Real estate – residential		2,980				1,727			11,078			15,785			85,361			101,146			823
Consumer installment loans		49				—			311			360			587			947			—
Total	$	13,544			$	7,785		$	64,368		$	85,697		$	331,952		$	417,649		$	1,657
	Loans				Loans			Loans 90			Total			Current			Total			Loans 90
	30-59				60-89			or More			Loans			Loans			Loans			Days or
	Days Past				Days			Days Past			Past Due									More Past
	Due				Past Due			Due												Due and
																				Still
																				Accruing
	(Dollars in Thousands)
As of December 30, 2012:
Commercial, financial & agricultural	$	2,390			$	1,105		$	10,612		$	14,107		$	18,499		$	32,606		$	98
Real estate – construction & development		1,584				2,592			19,656			23,832			46,352			70,184			1,077
Real estate – commercial & farmland		11,451				7,373			52,570			71,394			207,112			278,506			1,347
Real estate – residential		6,066				3,396			24,976			34,438			90,618			125,056			779
Consumer installment loans		45				13			258			316			1,044			1,360			—
Total	$	21,536			$	14,479		$	108,072		$	144,087		$	363,625		$	507,712		$	3,301
	Loans				Loans			Loans 90			Total			Current			Total			Loans 90
	30-59				60-89			or More			Loans			Loans			Loans			Days or
	Days Past				Days			Days Past			Past Due									More Past
	Due				Past Due			Due												Due and
																				Still
																				Accruing
	(Dollars in Thousands)
As of September 30, 2012:
Commercial, financial & agricultural	$	1,384			$	788		$	11,315		$	13,487		$	23,680		$	37,167		$	—
Real estate – construction & development		3,611				1,663			22,194			27,468			45,888			73,356			2,312
Real estate – commercial & farmland		7,072				6,559			51,382			65,013			233,890			298,903			808
Real estate – residential		4,702				3,349			28,559			36,610			98,544			135,154			1,018
Consumer installment loans		56				92			255			403			1,251			1,654			—
Total	$	16,825			$	12,451		$	113,705		$	142,981		$	403,253		$	546,234		$	4,138
Impaired Loans
Loans are considered impaired when, based on current information and events, it is probable the Company will be unable to collect all amounts due in accordance with the original contractual terms of the loan agreements. When determining if the Company will be unable to collect all principal and interest payments due in accordance with the contractual terms of the loan agreement, the Company considers the borrower’s capacity to pay, which includes such factors as the borrower’s current financial statements, an analysis of global cash flow sufficient to pay all debt obligations and an evaluation of secondary sources of repayment, such as guarantor support and collateral value. Impaired loans include loans on nonaccrual status and troubled debt restructurings. The Company individually assesses for impairment all nonaccrual loans greater than $200,000 and rated substandard or worse and all troubled debt restructurings greater than $100,000. If a loan is deemed impaired, a specific valuation allowance is allocated, if necessary, so that the loan is reported net, at the present value of estimated future cash flows using the loan’s existing rate or at the fair value of collateral if repayment is expected solely from the collateral. Interest payments on impaired loans are typically applied to principal unless collectability of the principal amount is reasonably assured, in which case interest is recognized on a cash basis.
The following is a summary of information pertaining to non-covered impaired loans:
	As of and For the Period Ended
	September 30,				December 31,			September 30,
	2013				2012			2012
	(Dollars in Thousands)
Nonaccrual loans	$	31,720			$	38,885		$	38,225
Troubled debt restructurings not included above		17,024				18,744			19,893
Total impaired loans	$	48,744			$	57,629		$	58,118
Impaired loans not requiring a related allowance	$	—			$	—		$	—
Impaired loans requiring a related allowance	$	48,744			$	57,629		$	58,118
Allowance related to impaired loans	$	5,180			$	5,115		$	7,681
Average investment in impaired loans	$	53,047			$	70,209		$	73,353
Interest income recognized on impaired loans	$	468			$	495		$	376
Foregone interest income on impaired loans	$	388			$	718		$	491
The following table presents an analysis of information pertaining to non-covered impaired loans as of September 30, 2013, December 31, 2012 and September 30, 2012.
	Unpaid				Recorded			Recorded			Total			Related			Average
	Contractual				Investment			Investment			Recorded			Allowance			Recorded
	Principal				With No			With			Investment						Investment
	Balance				Allowance			Allowance
	(Dollars in Thousands)
As of September 30, 2013:
Commercial, financial & agricultural	$	7,401			$	—		$	4,719		$	4,719		$	820		$	4,900
Real estate – construction & development		14,299				—			6,155			6,155			821			8,960
Real estate – commercial & farmland		18,628				—			16,241			16,241			1,999			18,079
Real estate – residential		24,701				—			21,174			21,174			1,530			20,427
Consumer installment loans		565				—			455			455			10			681
Total	$	65,594			$	—		$	48,744		$	48,744		$	5,180		$	53,047
	Unpaid				Recorded			Recorded			Total			Related			Average
	Contractual				Investment			Investment			Recorded			Allowance			Recorded
	Principal				With No			With			Investment						Investment
	Balance				Allowance			Allowance
	(Dollars in Thousands)
As of December 31, 2012:
Commercial, financial & agricultural	$	8,024			$	—		$	4,940		$	4,940		$	743		$	4,968
Real estate – construction & development		20,316				—			11,016			11,016			910			11,706
Real estate – commercial & farmland		25,076				—			20,910			20,910			2,191			30,638
Real estate – residential		24,155				—			19,848			19,848			1,246			21,813
Consumer installment loans		1,187				—			915			915			25			1,084
Total	$	78,758			$	—		$	57,629		$	57,629		$	5,115		$	70,209
	Unpaid				Recorded			Recorded			Total			Related			Average
	Contractual				Investment			Investment			Recorded			Allowance			Recorded
	Principal				With No			With			Investment						Investment
	Balance				Allowance			Allowance
	(Dollars in Thousands)
As of September 30, 2012:
Commercial, financial & agricultural	$	8,261			$	—		$	5,089		$	5,089		$	876		$	4,974
Real estate – construction & development		19,583				—			9,682			9,682			1,253			11,879
Real estate – commercial & farmland		25,346				—			20,948			20,948			2,907			33,070
Real estate – residential		24,993				—			21,304			21,304			2,616			22,303
Consumer installment loans		1,220				—			1,095			1,095			29			1,127
Total	$	79,403			$	—		$	58,118		$	58,118		$	7,681		$	73,353
The following is a summary of information pertaining to covered impaired loans:
	As of and For the Period Ended
	September 30,				December 31,			September 30,
	2013				2012			2012
	(Dollars in Thousands)
Nonaccrual loans	$	74,911			$	115,712		$	123,901
Troubled debt restructurings not included above		21,184				19,194			25,926
Total impaired loans	$	96,095			$	134,906		$	149,827
Impaired loans not requiring a related allowance	$	96,095			$	134,906		$	149,827
Impaired loans requiring a related allowance	$	—			$	—		$	—
Allowance related to impaired loans	$	—			$	—		$	—
Average investment in impaired loans	$	115,689			$	163,825		$	171,055
Interest income recognized on impaired loans	$	793			$	849		$	1,319
Foregone interest income on impaired loans	$	286			$	491		$	554
The following table presents an analysis of information pertaining to impaired covered loans as of September 30, 2013, December 31, 2012 and September 30, 2012.
	Unpaid				Recorded			Recorded			Total			Related			Average
	Contractual				Investment			Investment			Recorded			Allowance			Recorded
	Principal				With No			With			Investment						Investment
	Balance				Allowance			Allowance
	(Dollars in Thousands)
As of September 30, 2013:
Commercial, financial & agricultural	$	10,645			$	7,884		$	—		$	7,884		$	—		$	9,052
Real estate – construction & development		25,401				20,890			—			20,890			—			22,734
Real estate – commercial & farmland		51,105				43,279			—			43,279			—			54,292
Real estate – residential		28,078				23,692			—			23,692			—			29,316
Consumer installment loans		404				350			—			350			—			295
Total	$	115,633			$	96,095		$	—		$	96,095		$	—		$	115,689
	Unpaid				Recorded			Recorded			Total			Related			Average
	Contractual				Investment			Investment			Recorded			Allowance			Recorded
	Principal				With No			With			Investment						Investment
	Balance				Allowance			Allowance
	(Dollars in Thousands)
As of December 31, 2012:
Commercial, financial & agricultural	$	27,060			$	10,802		$	—		$	10,802		$	—		$	12,506
Real estate – construction & development		85,279				23,236			—			23,236			—			29,970
Real estate – commercial & farmland		159,493				64,231			—			64,231			—			78,790
Real estate – residential		63,559				36,335			—			36,335			—			42,061
Consumer installment loans		393				302			—			302			—			498
Total	$	335,784			$	134,906		$	—		$	134,906		$	—		$	163,825
	Unpaid				Recorded			Recorded			Total			Related			Average
	Contractual				Investment			Investment			Recorded			Allowance			Recorded
	Principal				With No			With			Investment						Investment
	Balance				Allowance			Allowance
	(Dollars in Thousands)
As of September 30, 2012:
Commercial, financial & agricultural	$	17,833			$	11,976		$	—		$	11,976		$	—		$	12,932
Real estate – construction & development		34,787				23,833			—			23,833			—			31,653
Real estate – commercial & farmland		98,909				72,802			—			72,802			—			82,430
Real estate – residential		54,020				40,790			—			40,790			—			43,492
Consumer installment loans		890				426			—			426			—			548
Total	$	206,439			$	149,827		$	—		$	149,827		$	—		$	171,055
Credit Quality Indicators
The Company uses a nine category risk grading system to assign a risk grade to each loan in the portfolio. Following is a description of the general characteristics of the grades:
Grade 10 – Prime Credit – This grade represents loans to the Company’s most creditworthy borrowers or loans that are secured by cash or cash equivalents.
Grade 15 – Good Credit – This grade includes loans that exhibit one or more characteristics better than that of a Satisfactory Credit. Generally, debt service coverage and borrower’s liquidity is materially better than required by the Company’s loan policy.
Grade 20 – Satisfactory Credit – This grade is assigned to loans to borrowers who exhibit satisfactory credit histories, contain acceptable loan structures and demonstrate ability to repay.
Grade 23 – Performing, Under-Collateralized Credit – This grade is assigned to loans that are currently performing and supported by adequate financial information that reflects repayment capacity but exhibits a loan-to-value ratio greater than 110%, based on a documented collateral valuation.
Grade 25 – Minimum Acceptable Credit – This grade includes loans which exhibit all the characteristics of a Satisfactory Credit, but warrant more than normal level of banker supervision due to (i) circumstances which elevate the risks of performance (such as start-up operations, untested management, heavy leverage, interim losses); (ii) adverse, extraordinary events that have affected, or could affect, the borrower’s cash flow, financial condition, ability to continue operating profitability or refinancing (such as death of principal, fire, divorce); (iii) loans that require more than the normal servicing requirements (such as any type of construction financing, acquisition and development loans, accounts receivable or inventory loans and floor plan loans); (iv) existing technical exceptions which raise some doubts about the Bank’s perfection in its collateral position or the continued financial capacity of the borrower; or (v) improvements in formerly criticized borrowers, which may warrant banker supervision.
Grade 30 – Other Asset Especially Mentioned – This grade includes loans that exhibit potential weaknesses that deserve management’s close attention. If left uncorrected, these weaknesses may result in deterioration of the repayment prospects for the asset or in the Company’s credit position at some future date.
Grade 40 – Substandard – This grade represents loans which are inadequately protected by the current sound worth and paying capacity of the borrower or of the collateral pledged, if any. These assets exhibit a well-defined weakness or are characterized by the distinct possibility that the Bank will sustain some loss if the deficiencies are not corrected. These weaknesses may be characterized by past due performance, operating losses or questionable collateral values.
Grade 50 – Doubtful – This grade includes loans which exhibit all of the characteristics of a substandard loan with the added provision that the weaknesses make collection or liquidation in full, on the basis of currently existing facts, conditions and values, highly questionable or improbable.
Grade 60 – Loss – This grade is assigned to loans which are considered uncollectible and of such little value that their continuance as active assets of the Bank is not warranted. This classification does not mean that the loss has absolutely no recovery or salvage value, but rather it is not practical or desirable to defer writing it off.
The following table presents the non-covered loan portfolio by risk grade as of September 30, 2013.
Risk	Commercial,				Real estate -			Real estate -			Real estate -			Consumer			Other			Total
Grade	financial &				construction &			commercial &			residential			installment loans
	agricultural				development			farmland
	(Dollars in Thousands)
10	$	65,033			$	—		$	278		$	420		$	7,028		$	—		$	72,759
15		20,668				5,080			147,355			56,464			1,243			—			230,810
20		89,216				37,765			421,669			142,186			19,691			20,627			731,154
23		97				7,085			10,054			13,275			218			—			30,729
25		60,407				72,942			183,371			109,604			7,034			—			433,358
30		3,019				2,264			12,089			11,427			153			—			28,952
40		6,326				7,141			24,333			22,534			936			—			61,270
50		225				—			—			10			—			—			235
60		—				—			—			—			—			—			—
Total	$	244,991			$	132,277		$	799,149		$	355,920		$	36,303		$	20,627		$	1,589,267
The following table presents the non-covered loan portfolio by risk grade as of December 31, 2012.
Risk	Commercial,				Real estate -			Real estate -			Real estate -			Consumer			Other			Total
Grade	financial &				construction &			commercial &			residential			installment loans
	agricultural				development			farmland
	(Dollars in Thousands)
10	$	24,623			$	—		$	309		$	464		$	7,597		$	—		$	32,993
15		11,316				4,373			147,966			71,254			1,591			—			236,500
20		79,522				31,413			351,997			114,418			21,361			43,239			641,950
23		42				8,521			9,012			13,788			70			—			31,433
25		49,071				52,577			176,395			113,591			7,576			—			399,210
30		2,343				3,394			19,401			9,672			488			—			35,298
40		7,200				13,765			27,242			23,292			1,495			—			72,994
50		100				156			—			1			—			—			257
60		—				—			—			—			—			—			—
Total	$	174,217			$	114,199		$	732,322		$	346,480		$	40,178		$	43,239		$	1,450,635
The following table presents the non-covered loan portfolio by risk grade as of September 30, 2012.
Risk	Commercial,				Real estate -			Real estate -			Real estate -			Consumer			Other			Total
Grade	financial &				construction &			commercial &			residential			installment loans
	agricultural				development			farmland
	(Dollars in Thousands)
10	$	26,291			$	—		$	220		$	411		$	7,887		$	—		$	34,809
15		11,816				4,532			152,678			74,040			1,400			—			244,466
20		80,681				33,603			324,270			105,531			23,038			25,160			592,283
23		5				7,667			8,773			13,650			81			—			30,176
25		62,377				59,013			184,146			113,560			8,502			—			427,598
30		1,508				7,948			14,742			10,535			745			—			35,478
40		6,436				12,396			28,411			25,583			1,780			—			74,606
50		260				156			—			22			8			—			446
60		—				—			—			—			—			—			—
Total	$	189,374			$	125,315		$	713,240		$	343,332		$	43,441		$	25,160		$	1,439,862
The following table presents the covered loan portfolio by risk grade as of September 30, 2013.
Risk	Commercial,				Real estate -			Real estate -			Real estate -			Consumer			Other			Total
Grade	financial &				construction &			commercial &			residential			installment loans
	agricultural				development			farmland
	(Dollars in Thousands)
10	$	—			$	—		$	—		$	—		$	—		$	—		$	—
15		—				22			1,098			641			—			—			1,761
20		2,697				11,347			34,252			22,545			208			—			71,049
23		135				1,080			16,708			2,902			51			—			20,876
25		7,609				7,360			108,886			39,632			250			—			163,737
30		1,485				5,505			24,790			9,196			14			—			40,990
40		15,842				25,388			51,352			26,230			424			—			119,236
50		—				—			—			—			—			—			—
60		—				—			—			—			—			—			—
Total	$	27,768			$	50,702		$	237,086		$	101,146		$	947		$	—		$	417,649
The following table presents the covered loan portfolio by risk grade as of December 31, 2012.
Risk	Commercial,				Real estate -			Real estate -			Real estate -			Consumer			Other			Total
Grade	financial &				construction &			commercial &			residential			installment loans
	agricultural				development			farmland
	(Dollars in Thousands)
10	$	—			$	—		$	—		$	—		$	—		$	—		$	—
15		—				39			1,640			644			—			—			2,323
20		3,997				12,194			37,098			31,337			292			—			84,918
23		28				1,174			9,576			2,052			—			—			12,830
25		10,013				19,216			114,849			40,194			558			—			184,830
30		4,294				7,214			38,665			11,883			50			—			62,106
40		14,274				30,347			76,678			38,946			460			—			160,705
50		—				—			—			—			—			—			—
60		—				—			—			—			—			—			—
Total	$	32,606			$	70,184		$	278,506		$	125,056		$	1,360		$	—		$	507,712
The following table presents the covered loan portfolio by risk grade as of September 30, 2012.
Risk	Commercial,				Real estate -			Real estate -			Real estate -			Consumer			Other			Total
Grade	financial &				construction &			commercial &			residential			installment loans
	agricultural				development			farmland
	(Dollars in Thousands)
10	$	—			$	8		$	—		$	853		$	—		$	—		$	861
15		91				44			1,673			708			—			—			2,516
20		4,970				13,950			40,912			34,397			319			—			94,548
23		30				1,226			4,638			1,889			—			—			7,783
25		11,986				18,921			130,155			44,999			721			—			206,782
30		4,063				7,494			35,764			9,016			64			—			56,401
40		16,027				31,713			85,761			43,292			550			—			177,343
50		—				—			—			—			—			—			—
60		—				—			—			—			—			—			—
Total	$	37,167			$	73,356		$	298,903		$	135,154		$	1,654		$	—		$	546,234
Troubled Debt Restructurings
The restructuring of a loan is considered a “troubled debt restructuring” if both (i) the borrower is experiencing financial difficulties and (ii) the Company has granted a concession. Concessions may include interest rate reductions to below market interest rates, principal forgiveness, restructuring amortization schedules and other actions intended to minimize potential losses. The Company has exhibited the greatest success for rehabilitation of the loan by a reduction in the rate alone (maintaining the amortization of the debt) or a combination of a rate reduction and the forbearance of previously past due interest or principal. This has most typically been evidenced in certain commercial real estate loans whereby a disruption in the borrower’s cash flow resulted in an extended past due status, of which the borrower was unable to catch up completely as the cash flow of the property ultimately stabilized at a level lower than its original level. A reduction in rate, coupled with a forbearance of unpaid principal and/or interest, allowed the net cash flows to service the debt under the modified terms.
The Company’s policy requires a restructure request to be supported by a current, well-documented credit evaluation of the borrower’s financial condition and a collateral evaluation that is no older than six months from the date of the restructure. Key factors of that evaluation include the documentation of current, recurring cash flows, support provided by the guarantor(s) and the current valuation of the collateral. If the appraisal in file is older than six months, an evaluation must be made as to the continued reasonableness of the valuation. For certain income-producing properties, current rent rolls and/or other income information can be utilized to support the appraisal valuation, when coupled with documented cap rates within our markets and a physical inspection of the collateral to validate the current condition.
The Company’s policy states in the event a loan has been identified as a troubled debt restructuring, it should be assigned a grade of substandard and placed on nonaccrual status until such time that the borrower has demonstrated the ability to service the loan payments based on the restructured terms – generally defined as six months of satisfactory payment history. Missed payments under the original loan terms are not considered under the new structure; however, subsequent missed payments are considered non-performance and are not considered toward the six month required term of satisfactory payment history. The Company’s loan policy states that a nonaccrual loan may be returned to accrual status when (i) none of its principal and interest is due and unpaid, and the Company expects repayment of the remaining contractual principal and interest, or (ii) it otherwise becomes well secured and in the process of collection. Restoration to accrual status on any given loan must be supported by a well-documented credit evaluation of the borrower’s financial condition and the prospects for full repayment, approved by the Company’s Senior Credit Officer.
In the normal course of business, the Company renews loans with a modification of the interest rate or terms that are not deemed as troubled debt restructurings because the borrower is not experiencing financial difficulty. The Company modified loans in the first nine months of 2013 totaling $17.0 million and loans in the first nine months of 2012 totaling $23.5 million under such parameters. In addition, the Company offers consumer loan customers an annual skip-a-pay program that is based on certain qualifying parameters and not based on financial difficulties. The Company does not treat these as troubled debt restructurings.
The following table presents the amount of troubled debt restructurings by loan class, classified separately as accrual and non-accrual at September 30, 2013, December 31, 2012 and September 30, 2012:
As of September 30, 2013	Accruing Loans						Non-Accruing Loans
			Balance					Balance
Loan class:	#		(in thousands)				#	(in thousands)
Commercial, financial & agricultural	4		$	521			3	$	533
Real estate – construction & development	8			1,926			1		29
Real estate – commercial & farmland	16			6,693			3		1,858
Real estate – residential	35			7,871			7		704
Consumer installment	1			13			2		26
Total	64		$	17,024			16	$	3,150
As of December 31, 2012	Accruing Loans						Non-Accruing Loans
			Balance					Balance
Loan class:	#		(in thousands)				#	(in thousands)
Commercial, financial & agricultural	5		$	802			—	$	—
Real estate – construction & development	5			1,735			—		—
Real estate – commercial & farmland	16			8,947			3		4,149
Real estate – residential	28			7,254			2		1,022
Consumer installment	1			6			—		—
Total	55		$	18,744			5	$	5,171
As of September 30, 2012	Accruing Loans						Non-Accruing Loans
			Balance					Balance
Loan class:	#		(in thousands)				#	(in thousands)
Commercial, financial & agricultural	5		$	804			—	$	—
Real estate – construction & development	4			1,481			—		—
Real estate – commercial & farmland	15			9,540			1		2,770
Real estate – residential	27			8,068			2		620
Total	51		$	19,893			3	$	3,390
The following table presents the amount of troubled debt restructurings by loan class, classified separately as those currently paying under restructured terms and those that have defaulted under restructured terms at September 30, 2013, December 31, 2012 and September 30, 2012:
As of September 30, 2013	Loans Currently Paying						Loans that have Defaulted
	Under Restructured						Under Restructured
	Terms						Terms
			Balance					Balance
Loan class:	#		(in thousands)				#	(in thousands)
Commercial, financial & agricultural	3		$	508			4	$	546
Real estate – construction & development	6			1,881			3		74
Real estate – commercial & farmland	14			6,550			5		2,001
Real estate – residential	31			7,282			11		1,293
Consumer installment	2			37			1		2
Total	56		$	16,258			24	$	3,916
As of December 31, 2012	Loans Currently Paying						Loans that have Defaulted
	Under Restructured						Under Restructured
	Terms						Terms
			Balance					Balance
Loan class:	#		(in thousands)				#	(in thousands)
Commercial, financial & agricultural	5		$	802			—	$	—
Real estate – construction & development	5			1,735			—		—
Real estate – commercial & farmland	16			8,947			3		4,149
Real estate – residential	28			7,254			2		1,022
Consumer installment	—			—			1		6
Total	54		$	18,738			6	$	5,177
As of September 30, 2012	Loans Currently Paying						Loans that have Defaulted
	Under Restructured						Under Restructured
	Terms						Terms
			Balance					Balance
Loan class:	#		(in thousands)				#	(in thousands)
Commercial, financial & agricultural	5		$	804			—	$	—
Real estate – construction & development	4			1,481			—		—
Real estate – commercial & farmland	15			9,540			1		2,770
Real estate – residential	26			8,068			3		620
Total	50		$	19,893			4	$	3,390
The following table presents the amount of troubled debt restructurings by types of concessions made, classified separately as accrual and non-accrual at September 30, 2013, December 31, 2012 and September 30, 2012:
As of September 30, 2013	Accruing Loans						Non-Accruing Loans
			Balance					Balance
Type of concession:	#		(in thousands)				#	(in thousands)
Forbearance of interest	9		$	2,135			2	$	101
Forgiveness of principal	3			1,479			1		145
Payment modification only	2			370			—		—
Rate reduction only	14			7,146			2		496
Rate reduction, forbearance of interest	18			2,878			10		2,379
Rate reduction, forbearance of principal	18			3,016			—		—
Rate reduction, payment modification	—			—			1		29
Total	64		$	17,024			16	$	3,150
As of December 31, 2012	Accruing Loans						Non-Accruing Loans
			Balance					Balance
Type of concession:	#		(in thousands)				#	(in thousands)
Forbearance of interest	2		$	1,873			—	$	—
Forgiveness of principal	3			1,518			1		372
Payment modification only	2			376			—		—
Rate reduction only	11			7,075			1		177
Rate reduction, forbearance of interest	18			4,061			2		3,420
Rate reduction, forbearance of principal	18			3,798			—		—
Rate reduction, payment modification	1			43			1		1,202
Total	55		$	18,744			5	$	5,171
As of September 30, 2012	Accruing Loans						Non-Accruing Loans
			Balance					Balance
Type of concession:	#		(in thousands)				#	(in thousands)
Forbearance of interest	2		$	1,902			—	$	—
Forgiveness of principal	3			1,516			1		369
Payment modification only	2			1,292			1		251
Rate reduction only	10			5,889			—		—
Rate reduction, forbearance of interest	15			4,371			1		2,770
Rate reduction, forbearance of principal	18			4,874			—		—
Rate reduction, payment modification	1			49			—		—
Total	51		$	19,893			3	$	3,390
The following table presents the amount of troubled debt restructurings by collateral types, classified separately as accrual and non-accrual at September 30, 2013, December 31, 2012 and September 30, 2012:
As of September 30, 2013	Accruing Loans						Non-Accruing Loans
			Balance					Balance
Collateral type:	#		(in thousands)				#	(in thousands)
Warehouse	3		$	1,065			1	$	176
Raw land	3			1,337			1		29
Agricultural land	2			380			—		—
Hotel & motel	3			2,219			—		—
Office	4			1,924			—		—
Retail, including strip centers	4			1,105			2		1,682
1-4 family residential	40			8,460			7		704
Life insurance policy	1			250			—		—
Automobile/equipment/inventory	3			36			4		509
Unsecured	1			248			1		50
Total	64		$	17,024			16	$	3,150
As of December 31, 2012	Accruing Loans						Non-Accruing Loans
			Balance					Balance
Collateral type:	#		(in thousands)				#	(in thousands)
Warehouse	3		$	1,692			1	$	177
Raw land	2			1,337			—		—
Hotel & motel	3			2,318			—		—
Office	4			2,105			1		2,770
Retail, including strip centers	6			2,833			1		1,202
1-4 family residential	31			7,651			2		1,022
Life insurance policy	1			250			—		—
Automobile/equipment/inventory	4			508			—		—
Unsecured	1			50			—		—
Total	55		$	18,744			5	$	5,171
As of September 30, 2012	Accruing Loans						Non-Accruing Loans
			Balance					Balance
Collateral type:	#		(in thousands)				#	(in thousands)
Warehouse	3		$	1,621			—	$	—
Raw land	2			1,349			—		—
Hotel & motel	3			2,362			—		—
Office	2			1,503			1		2,770
Retail, including strip centers	7			4,054			—		—
1-4 family residential	30			8,216			2		620
Inventory	1			450			—		—
Equipment	1			38			—		—
Unsecured	2			300			—		—
Total	51		$	19,893			3	$	3,390
As of September 30, 2013, December 31, 2012 and September 30, 2012, the Company had a balance of $20.2 million, $23.9 million and $23.3 million, respectively, in troubled debt restructurings. The Company has recorded $2.1 million, $1.9 million and $2.1 million in previous charge-offs on such loans at September 30, 2013, December 31, 2012 and September 30, 2012, respectively. The Company’s balance in the allowance for loan losses allocated to such troubled debt restructurings was $412,000, $640,000 and $676,000 at September 30, 2013, December 31, 2012 and September 30, 2012, respectively. At September 30, 2013, the Company did not have any commitments to lend additional funds to debtors whose terms have been modified in troubled restructurings.
Allowance for Loan Losses
The allowance for loan losses represents a reserve for inherent losses in the loan portfolio. The adequacy of the allowance for loan losses is evaluated periodically based on a review of all significant loans, with a particular emphasis on non-accruing, past due and other loans that management believes might be potentially impaired or warrant additional attention. The Company segregates the loan portfolio by type of loan and utilizes this segregation in evaluating exposure to risks within the portfolio. In addition, based on internal reviews and external reviews performed by independent auditors and regulatory authorities, the Company further segregates the loan portfolio by loan grades based on an assessment of risk for a particular loan or group of loans. Certain reviewed loans are assigned specific allowances when a review of relevant data determines that a general allocation is not sufficient or when the review affords management the opportunity to adjust the amount of exposure in a given credit. In establishing allowances, management considers historical loan loss experience but adjusts this data with a significant emphasis on data such as current loan quality trends, current economic conditions and other factors in the markets where the Company operates. Factors considered include, among others, current valuations of real estate in their markets, unemployment rates, the effect of weather conditions on agricultural related entities and other significant local economic events.
The Company has developed a methodology for determining the adequacy of the allowance for loan losses which is monitored by the Company’s Chief Credit Officer. Procedures provide for the assignment of a risk rating for every loan included in the total loan portfolio, with the exception of credit card receivables and overdraft protection loans which are treated as pools for risk rating purposes. The risk rating schedule provides nine ratings of which five ratings are classified as pass ratings and four ratings are classified as criticized ratings. Each risk rating is assigned a percentage factor to be applied to the loan balance to determine the adequate amount of reserve. Many of the larger loans require an annual review by an independent loan officer or an independent third party loan review firm. As a result of these loan reviews, certain loans may be assigned specific reserve allocations. Other loans that surface as problem loans may also be assigned specific reserves. Past due loans are assigned risk ratings based on the number of days past due. The calculation of the allowance for loan losses, including underlying data and assumptions, is reviewed regularly by the Company’s Chief Financial Officer and the Director of Internal Audit.
Loan losses are charged against the allowance when management believes the collection of a loan’s principal is unlikely. Subsequent recoveries are credited to the allowance. Consumer loans are charged-off in accordance with the Federal Financial Institutions Examination Council’s (“FFIEC”) Uniform Retail Credit Classification and Account Management Policy. Commercial loans are charged-off when they are deemed uncollectible, which usually involves a triggering event within the collection effort. If the loan is collateral dependent, the loss is more easily identified and is charged-off when it is identified, usually based upon receipt of an appraisal. However, when a loan has guarantor support, the Company may carry the estimated loss as a reserve against the loan while collection efforts with the guarantor are pursued. If, after collection efforts with the guarantor are complete, the deficiency is still considered uncollectible, the loss is charged-off and any further collections are treated as recoveries. In all situations, when a loan is downgraded to an Asset Quality Rating of 60 (Loss per the regulatory guidance), the uncollectible portion is charged-off.
During the nine months ended September 30, 2013, the year ended December 31, 2012 and the nine months ended September 30, 2012, the Company recorded provision for loan loss expense of $1.3 million, $2.6 million and $2.3 million, respectively, to account for losses where the initial estimate of cash flows was found to be excessive on loans acquired in FDIC-assisted transactions. These amounts are excluded from the rollforwards below but are reflected in the Company’s Consolidated Statements of Earnings and Comprehensive Income.
The following table details activity in the allowance for loan losses by portfolio segment for the nine months ended September 30, 2013, the year ended December 31, 2012 and the nine months ended September 30, 2012. Allocation of a portion of the allowance to one category of loans does not preclude its availability to absorb losses in other categories.
	Commercial,				Real estate -			Real estate -			Real estate -			Consumer			Total
	financial &				construction &			commercial &			residential			installment
	agricultural				development			farmland						loans and
														Other
	(Dollars in Thousands)
Balance, January 1, 2013	$	2,439			$	5,343		$	9,157		$	5,898		$	756		$	23,593
Provision for loan losses		1,011				2,127			2,632			2,966			11			8,747
Loans charged off		(1,216	)			(1,598	)		(2,873	)		(3,430	)		(576	)		(9,693	)
Recoveries of loans previously charged off		340				88			18			520			241			1,207
Balance, September 30, 2013	$	2,574			$	5,960		$	8,934		$	5,954		$	432		$	23,854
Period-end amount allocated to:
Loans individually evaluated for impairment	$	741			$	682		$	1,997		$	1,429		$	—		$	4,849
Loans collectively evaluated for impairment		1,833				5,278			6,937			4,525			432			19,005
Ending balance	$	2,574			$	5,960		$	8,934		$	5,954		$	432		$	23,854
Loans:
Individually evaluated for impairment	$	3,657			$	3,524		$	14,605		$	16,919		$	—		$	38,705
Collectively evaluated for impairment		241,334				128,753			784,544			339,001			56,930			1,550,562
Ending balance	$	244,991			$	132,277		$	799,149		$	355,920		$	56,930		$	1,589,267
	Commercial,				Real estate -			Real estate -			Real estate -			Consumer			Total
	financial &				construction &			commercial &			residential			installment
	agricultural				development			farmland						loans and
														Other
	(Dollars in Thousands)
Balance, January 1, 2012	$	2,918			$	9,438		$	14,226		$	8,128		$	446		$	35,156
Provision for loan losses		815				5,245			15,000			6,267			1,124			28,451
Loans charged off		(1,451	)			(9,380	)		(20,551	)		(8,722	)		(1,059	)		(41,163	)
Recoveries of loans previously charged off		157				40			482			225			245			1,149
Balance, December 31, 2012	$	2,439			$	5,343		$	9,157		$	5,898		$	756		$	23,593
Period-end amount allocated to:
Loans individually evaluated for impairment	$	659			$	611		$	2,228		$	1,056		$	—		$	4,554
Loans collectively evaluated for impairment		1,780				4,732			6,929			4,842			756			19,039
Ending balance	$	2,439			$	5,343		$	9,157		$	5,898		$	756		$	23,593
Loans:
Individually evaluated for impairment	$	3,351			$	7,617		$	21,332		$	13,020		$	—		$	45,320
Collectively evaluated for impairment		170,866				106,582			710,990			333,460			83,417			1,405,315
Ending balance	$	174,217			$	114,199		$	732,322		$	346,480		$	83,417		$	1,450,635
	Commercial,				Real estate -			Real estate -			Real estate -			Consumer			Total
	financial &				construction &			commercial &			residential			installment
	agricultural				development			farmland						loans and
														Other
	(Dollars in Thousands)
Balance, January 1, 2012	$	2,918			$	9,438		$	14,226		$	8,128		$	446		$	35,156
Provision for loan losses		677				4,954			13,087			4,936			706			24,360
Loans charged off		(889	)			(7,819	)		(18,199	)		(6,642	)		(618	)		(34,167	)
Recoveries of loans previously charged off		101				23			32			199			197			552
Balance, September 30, 2012	$	2,807			$	6,596		$	9,146		$	6,621		$	731		$	25,901
Period-end amount allocated to:
Loans individually evaluated for impairment	$	610			$	526		$	2,315		$	2,105		$	—		$	5,556
Loans collectively evaluated for impairment		2,197				6,070			6,831			4,516			731			20,345
Ending balance	$	2,807			$	6,596		$	9,146		$	6,621		$	731		$	25,901
Loans:
Individually evaluated for impairment	$	2,748			$	5,510		$	21,552		$	15,178		$	—		$	44,988
Collectively evaluated for impairment		186,626				119,805			691,688			328,154			68,601			1,394,874
Ending balance	$	189,374			$	125,315		$	713,240		$	343,332		$	68,601		$	1,439,862

Assets_Acquired_in_FDICAssiste

Assets Acquired in FDIC-Assisted Acquisitions	9 Months Ended
	Sep. 30, 2013
Business Combinations [Abstract]	'
Assets Acquired in FDIC-Assisted Acquisitions	'
	NOTE 5 – ASSETS ACQUIRED IN FDIC-ASSISTED ACQUISITIONS
	From October 2009 through July 2012, the Company participated in ten FDIC-assisted acquisitions whereby the Company purchased certain failed institutions out of the FDIC’s receivership. These institutions include the following:
	Bank Acquired	Location:		Branches:	Date Acquired
	American United Bank (“AUB”)	Lawrenceville, Ga.		1	October 23, 2009
	United Security Bank (“USB”)	Sparta, Ga.		2	November 6, 2009
	Satilla Community Bank (“SCB”)	St. Marys, Ga.		1	May 14, 2010
	First Bank of Jacksonville (“FBJ”)	Jacksonville, Fl.		2	October 22, 2010
	Tifton Banking Company (“TBC”)	Tifton, Ga.		1	November 12, 2010
	Darby Bank & Trust (“DBT”)	Vidalia, Ga.		7	November 12, 2010
	High Trust Bank (“HTB”)	Stockbridge, Ga.		2	July 15, 2011
	One Georgia Bank (“OGB”)	Midtown Atlanta, Ga.		1	July 15, 2011
	Central Bank of Georgia (“CBG”)	Ellaville, Ga.		5	February 24, 2012
	Montgomery Bank & Trust (“MBT”)	Ailey, Ga.		2	July 6, 2012
	The determination of the initial fair values of loans at the acquisition date and the initial fair values of the related FDIC indemnification assets involves a high degree of judgment and complexity. The carrying values of the acquired loans and the FDIC indemnification assets reflect management’s best estimate of the fair value of each of these assets as of the date of acquisition. However, the amount that the Company realizes on these assets could differ materially from the carrying values reflected in the financial statements included in this report, based upon the timing and amount of collections on the acquired loans in future periods. Because of the loss-sharing agreements with the FDIC on these assets, the Company does not expect to incur any significant losses. To the extent the actual values realized for the acquired loans are different from the estimates, the indemnification assets will generally be affected in an offsetting manner due to the loss-sharing support from the FDIC.
	FASB ASC 310 – 30, Loans and Debt Securities Acquired with Deteriorated Credit Quality (“ASC 310”), applies to a loan with evidence of deterioration of credit quality since origination, acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable. ASC 310 prohibits carrying over or creating an allowance for loan losses upon initial recognition for loans which fall under the scope of this statement. At the acquisition dates, a majority of these loans were valued based on the liquidation value of the underlying collateral because the future cash flows are primarily based on the liquidation of underlying collateral. There was no allowance for credit losses established related to these ASC 310 loans at the acquisition dates, based on the provisions of this statement. Over the life of the acquired loans, the Company continues to estimate cash flows expected to be collected. If the expected cash flows expected to be collected increases, then the Company adjusts the amount of accretable discount recognized on a prospective basis over the loan’s remaining life. If the expected cash flows expected to be collected decreases, then the Company records a provision for loan loss in its consolidated statement of operations.
	The following table summarizes components of all covered assets at September 30, 2013, December 31, 2012 and September 30, 2012 and their origin:
		Covered			Less:			Less:			Total		OREO		Less:		Total		Total		FDIC
		loans			Credit risk			Liquidity			covered				Fair value		covered		covered		indemnification
					adjustments			and rate			loans				adjustments		OREO		assets		asset
								adjustments
	As of September 30, 2013:	(Dollars in Thousands)
	AUB	$	19,336		$	915		$	—		$	18,421	$	3,338	$	3	$	3,335	$	21,756	$	3,704
	USB		21,168			1,665			—			19,503		3,066		139		2,927		22,430		2,796
	SCB		35,555			1,902			—			33,653		5,348		429		4,919		38,572		4,020
	FBJ		27,222			3,965			—			23,257		1,582		170		1,412		24,669		4,990
	DBT		116,685			21,739			—			94,946		19,720		1,639		18,081		113,027		23,955
	TBC		35,588			2,519			54			33,015		5,912		843		5,069		38,084		4,315
	HTB		70,156			8,232			41			61,883		6,998		2,445		4,553		66,436		11,065
	OGB		63,794			6,658			108			57,028		9,921		3,918		6,003		63,031		9,458
	CBG		92,755			16,712			100			75,943		8,299		2,046		6,253		82,196		17,460
	Total	$	482,259		$	64,307		$	303		$	417,649	$	64,184	$	11,632	$	52,552	$	470,201	$	81,763
		Covered			Less:			Less:			Total		OREO		Less:		Total		Total		FDIC
		loans			Credit risk			Liquidity			covered				Fair value		covered		covered		indemnification
					adjustments			and rate			loans				adjustments		OREO		assets		asset
								adjustments
	As of December 31, 2012:	(Dollars in Thousands)
	AUB	$	27,169		$	2,481		$	—		$	24,688	$	10,636	$	102	$	10,534	$	35,222	$	2,905
	USB		27,286			4,320			—			22,966		7,087		99		6,988		29,954		6,619
	SCB		41,389			3,285			—			38,104		10,686		654		10,032		48,136		6,133
	FBJ		32,574			6,204			27			26,343		3,260		526		2,734		29,077		6,589
	DBT		169,527			41,631			207			127,689		30,395		2,160		28,235		155,924		47,012
	TBC		46,796			4,979			173			41,644		11,089		1,381		9,708		51,352		8,073
	HTB		90,602			16,072			52			74,478		13,980		4,954		9,026		83,504		20,020
	OGB		81,908			17,127			136			64,645		9,168		4,078		5,090		69,735		16,871
	CBG		124,200			36,884			161			87,155		9,046		3,120		5,926		93,081		45,502
	Total	$	641,451		$	132,983		$	756		$	507,712	$	105,347	$	17,074	$	88,273	$	595,985	$	159,724
		Covered			Less:			Less:			Total		OREO		Less:		Total		Total		FDIC
		loans			Credit risk			Liquidity			covered				Fair value		covered		covered		indemnification
					adjustments			and rate			loans				adjustments		OREO		assets		asset
								adjustments
	As of September 30, 2012:	(Dollars in Thousands)
	AUB	$	28,955		$	2,532		$	—		$	26,423	$	10,342	$	—	$	10,342	$	36,765	$	3,256
	USB		33,145			5,036			—			28,109		7,641		99		7,542		35,651		8,408
	SCB		44,340			3,892			—			40,448		10,464		646		9,818		50,266		6,130
	FBJ		33,312			6,299			43			26,970		3,407		572		2,835		29,805		6,731
	DBT		186,815			47,598			331			138,886		33,404		2,798		30,606		169,492		63,789
	TBC		51,084			5,790			212			45,082		10,110		1,533		8,577		53,659		15,559
	HTB		95,904			18,727			56			77,121		15,219		5,766		9,453		86,574		23,698
	OGB		86,091			18,719			146			67,226		7,874		3,663		4,211		71,437		21,419
	CBG		139,583			43,406			208			95,969		8,518		3,007		5,511		101,480		49,450
	Total	$	699,229		$	151,999		$	996		$	546,234	$	106,979	$	18,084	$	88,895	$	635,129	$	198,440
	On the dates of acquisition, the Company estimated the future cash flows on each individual loan and made the necessary adjustments to reflect the asset at fair value. At each quarter end subsequent to the acquisition dates, the Company revises the estimates of future cash flows based on current information and makes the necessary adjustments to continue reflecting the assets at fair value. The adjustments to fair value are performed on a loan-by-loan basis and have resulted in the following:
	Total Amounts	September 30,			December 31,			September 30,
2013		2012			2012
	(Dollars in Thousands)
Adjustments needed where the Company’s initial estimate of cash flows were underestimated: (recorded with a reclassification from non-accretable difference to accretable discount)	$	50,703		$	23,050		$	16,210
Adjustments needed where the Company’s initial estimate of cash flows were overstated: (recorded through a provision for loan losses)		6,305			13,190			11,435
Amounts reflected in the Company’s Statement of Operations	September 30,			December 31,			September 30,
	2013			2012			2012
	(Dollars in Thousands)
Adjustments needed where the Company’s initial estimate of cash flows were underestimated: (recorded with a reclassification from non-accretable difference to accretable discount)	$	10,141		$	4,610		$	3,242
Adjustments needed where the Company’s initial estimate of cash flows were overstated: (recorded through a provision for loan losses)		1,261			2,638			2,287
A rollforward of acquired loans with deterioration of credit quality for the nine months ended September 30, 2013, the year ended December 31, 2012 and the nine months ended September 30, 2012 is shown below:
(Dollars in Thousands)	September 30,			December 31,			September 30,
	2013			2012			2012
Balance, January 1	$	282,737		$	307,790		$	307,790
Change in estimate of cash flows, net of charge-offs or recoveries		30,371			(17,712	)		(7,119	)
Additions due to acquisitions		—			73,414			73,414
Other (loan payments, transfers, etc.)		(81,519	)		(80,755	)		(70,402	)
Ending balance	$	231,589		$	282,737		$	303,683
A rollforward of acquired loans without deterioration of credit quality for the nine months ended September 30, 2013, the year ended December 31, 2012 and the nine months ended September 30, 2012 is shown below:
(Dollars in Thousands)	September 30,			December 31,			September 30,
	2013			2012			2012
Balance, January 1	$	228,602		$	266,966		$	266,966
Change in estimate of cash flows, net of charge-offs or recoveries		11,554			1,376			3,861
Additions due to acquisitions		—			51,368			51,367
Other (loan payments, transfers, etc.)		(53,870	)		(91,108	)		(72,755	)
Ending balance	$	186,286		$	228,602		$	249,439
The following is a summary of changes in the accretable discounts of acquired loans during the nine months ended September 30, 2013, the year ended December 31, 2012 and the nine months ended September 30, 2012.
(Dollars in Thousands)	September 30,			December 31,			September 30,
	2013			2012			2012
Balance, January 1	$	16,698		$	29,537		$	29,537
Additions due to acquisitions		—			9,863			9,863
Accretion		(36,552	)		(45,752	)		(36,241	)
Other activity, net		50,703			23,050			16,210
Ending balance	$	30,849		$	16,698		$	19,369
The shared-loss agreements are subject to the servicing procedures as specified in the agreement with the FDIC. The expected reimbursements under the shared-loss agreements were recorded as an indemnification asset at their estimated fair values on the acquisition dates. Changes in the FDIC shared-loss receivable for the nine months ended September 30, 2013, for the year ended December 31, 2012 and for the nine months ended September 30, 2012 are as follows:
(Dollars in Thousands)	September 30,			December 31,			September 30,
	2013			2012			2012
Balance, January 1	$	159,724		$	242,394		$	242,394
Indemnification asset recorded in acquisitions		—			52,654			52,654
Payments received from FDIC		(58,240	)		(128,730	)		(97,399	)
Effect of change in expected cash flows on covered assets		(19,721	)		(6,594	)		791
Ending balance	$	81,763		$	159,724		$	198,440

Weighted_Average_Shares_Outsta

Weighted Average Shares Outstanding	9 Months Ended
	Sep. 30, 2013
Earnings Per Share [Abstract]	'
Weighted Average Shares Outstanding	'
	NOTE 6 – WEIGHTED AVERAGE SHARES OUTSTANDING
	Earnings per share have been computed based on the following weighted average number of common shares outstanding:
		For the Three Months				For the Nine Months
		Ended September 30,				Ended September 30,
		2013		2012		2013		2012
		(Share Data in				(Share Data in
		Thousands)				Thousands)
	Basic shares outstanding		23,901		23,819		23,883		23,800
	Plus: Dilutive effect of ISOs		62		105		62		105
	Plus: Dilutive effect of Restricted grants		353		49		353		49
	Diluted shares outstanding		24,316		23,973		24,298		23,954

Other_Borrowings

Other Borrowings	9 Months Ended
	Sep. 30, 2013
Debt Disclosure [Abstract]	'
Other Borrowings	'
	NOTE 7 – OTHER BORROWINGS
	The Company has, from time to time, utilized certain borrowing arrangements with various financial institutions to fund growth in earning assets or provide additional liquidity when appropriate spreads can be realized. At September 30, 2013 there was $5.0 million in outstanding borrowings with the Company’s correspondent banks. There were no outstanding borrowings with the Company’s correspondent banks at December 31, 2012 and September 30, 2012. The Company’s success with attracting and retaining retail deposits has allowed for very low dependence on more volatile non-deposit funding.

Commitments

Commitments	9 Months Ended
	Sep. 30, 2013
Commitments And Contingencies Disclosure [Abstract]	'
Commitments	'
	NOTE 8 – COMMITMENTS
	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 and standby letters of credit. These instruments involve, to varying degrees, elements of credit risk in excess of the amount recognized in the consolidated balance sheets.
	The contract amounts of those instruments reflect the extent of involvement the Company has in particular classes of financial instruments. The Company uses the same credit policies in making commitments and conditional obligations as are used for on-balance-sheet instruments.
	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 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 issues standby letters of credit, which are conditional commitments issued to guarantee the performance of a customer to a third party. Those guarantees are primarily issued to support public and private borrowing arrangements and expire in decreasing amounts with varying terms. The credit risk involved in issuing letters of credit is essentially the same as that involved in extending loan facilities to customers. The Company holds various assets as collateral supporting those commitments for which collateral is deemed necessary.
	The Company evaluates each customer’s creditworthiness 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 borrower. Collateral held may include accounts receivable, inventory, property, plant and equipment, residential real estate and income-producing commercial properties.
	The Company’s commitments to extend credit and standby letters of credit are presented in the following table:
	(Dollars in Thousands)	September 30,		December 31,		September 30,
		2013		2012		2012
	Commitments to extend credit	$	208,303	$	180,733	$	145,936
	Standby letters of credit	$	6,954	$	6,788	$	9,367

Accumulated_Other_Comprehensiv

Accumulated Other Comprehensive Income	9 Months Ended
	Sep. 30, 2013
Text Block [Abstract]	'
Accumulated Other Comprehensive Income	'
	NOTE 9 – ACCUMULATED OTHER COMPREHENSIVE INCOME
	Accumulated other comprehensive income for the Company consists of changes in net unrealized gains and losses on investment securities available for sale and interest rate swap derivatives. The following tables present a summary of the accumulated other comprehensive income balances, net of tax, as of September 30, 2013 and 2012.
	(Dollars in Thousands)	Unrealized			Unrealized			Accumulated
		Gain			Gain			Other
		(Loss) on			(Loss) on			Comprehensive
		Derivatives			Securities			Income (Loss)
	Balance, January 1, 2013	$	(23	)	$	6,630		$	6,607
	Reclassification for gains included in net income		—			(111	)		(111	)
	Current year changes		1,098			(8,125	)		(7,027	)
	Balance, September 30, 2013	$	1,075		$	(1,606	)	$	(531	)
	(Dollars in Thousands)	Unrealized			Unrealized			Accumulated
		Gain			Gain			Other
		(Loss) on			(Loss) on			Comprehensive
		Derivatives			Securities			Income (Loss)
	Balance, January 1, 2012	$	856		$	6,440		$	7,296
	Reclassification for gains included in net income		—			—			—
	Current year changes		(976	)		1,017			41
	Balance, September 30, 2012	$	(120	)	$	7,457		$	7,337

Segment_Reporting

Segment Reporting	9 Months Ended
	Sep. 30, 2013
Segment Reporting [Abstract]	'
Segment Reporting	'
	NOTE 10 – SEGMENT REPORTING
	The following tables present selected financial information with respect to the Company’s reportable business segments for the three- and nine-month periods ended September 30 2013 and 2012.
		Three Months Ended						Three Months Ended
		30-Sep-13						30-Sep-12
		Retail		Mortgage		Total		Retail		Mortgage			Total
		Banking		Banking				Banking		Banking
		(Dollars in Thousands)
	Net interest income	$	28,089	$	1,231	$	29,320	$	27,953	$	285		$	28,238
	Provision for loan losses		2,920		—		2,920		6,540		—			6,540
	Noninterest income		7,054		5,234		12,288		6,091		3,740			9,831
	Noninterest expense
	Salaries and employee benefits		10,799		3,613		14,412		11,446		2,320			13,766
	Equipment and occupancy expenses		3,029		120		3,149		3,190		150			3,340
	Data processing and telecommunications expenses		2,908		164		30,72		2,510		89			2,599
	Other expenses		7,473		643		8,116		8,706		399			9,105
	Total noninterest expense		24,209		4,540		28,749		25,852		2,958			28,810
	Income before income tax expense		8,014		1,925		9,939		1,652		1,067			2,719
	Income tax expense		2,588		674		3,262		443		373			816
	Net income		5,426		1,251		6,677		1,209		694			1,903
	Less preferred stock dividends		443		—		443		827		—			827
	Net income available to common shareholders	$	4,983	$	1,251	$	6,234	$	382	$	694		$	1,076
	Total assets	$	2,707,200	$	111,302	$	2,818,502	$	2,947,004	$	2,379		$	2,949,383
	Stockholders’ equity		250,863		39,493		290,356		299,221		(15	)		299,206
		Nine Months Ended						Nine Months Ended
		30-Sep-13						30-Sep-12
		Retail		Mortgage		Total		Retail		Mortgage			Total
		Banking		Banking				Banking		Banking
		(Dollars in Thousands)
	Net interest income	$	84,372	$	2,762	$	87,134	$	84,243	$	603		$	84,846
	Provision for loan losses		10,008		—		10,008		26,647		—			26,647
	Noninterest income		20,333		14,699		35,032		37,749		8,221			45,970
	Noninterest expense
	Salaries and employee benefits		32,314		9,285		41,599		32,435		4,902			37,337
	Equipment and occupancy expenses		8,575		483		9,058		9,250		305			9,555
	Data processing and telecommunications expenses		8,013		465		8,478		7,222		207			7,429
	Other expenses		22,807		2,379		25,186		34,470		888			35,358
	Total noninterest expense		71,709		12,612		84,321		83,377		6,302			89,679
	Income before income tax expense		22,988		4,849		27,837		11,968		2,522			14,490
	Income tax expense		7,500		1,697		9,197		3,845		882			4,727
	Net income		15,488		3,152		18,640		8,123		1,640			9,763
	Less preferred stock dividends		1,326		—		1,326		2,459		—			2,459
	Net income available to common shareholders	$	14,162	$	3,152	$	17,314	$	5,664	$	1,640		$	7,304

Basis_of_Presentation_and_Acco1

Basis of Presentation and Accounting Policies (Policies)	9 Months Ended
	Sep. 30, 2013
Accounting Policies [Abstract]	'
Newly Adopted Accounting Pronouncements	'
	Newly Adopted Accounting Pronouncements
	ASU 2013-11 – Presentation of an Unrecognized Tax Benefit When a Net Operating Loss Carryforward, a Similar Tax Loss, or a Tax Credit Carryforward Exists (“ASU 2013-11”). ASU 2013-11 requires that an unrecognized tax benefit, or a portion of an unrecognized tax benefit, be presented in the financial statements as a reduction to a deferred tax asset for a net operating loss carryforward, a similar tax loss or a tax credit carryforward. However, if a net operating loss carryforward, a similar tax loss or a tax credit carryforward is not available at the reporting date under the tax law of the applicable jurisdiction to settle any additional income taxes that would result from the disallowance of a tax position or the tax law of the applicable jurisdiction does not require the entity to use, and the entity does not intend to use, the deferred tax asset for such purpose, the unrecognized tax benefit should be presented in the financial statements as a liability and should not be combined with deferred tax assets. The amendments are effective for fiscal years, and interim periods within those years, beginning after December 15, 2013. The amendments are not expected to have a material impact on the Company’s results of operations, financial position or disclosures.
	ASU 2013-02 – Reporting of Amounts Reclassified Out of Accumulated Other Comprehensive Income (“ASU 2013-02”). ASU 2013-02 requires an entity to provide information about the amounts reclassified from accumulated other comprehensive income by component. In addition, an entity is required to present, either on the face of the statement where net income is presented or in the notes, significant amounts reclassified out of accumulated other comprehensive income by the respective line items of net income but only if the amount reclassified is required under United States generally accepted accounting principles to be reclassified to net income in its entirety in the same reporting period. For all other amounts, an entity is required to cross-reference to other disclosures that provide additional details about these amounts. The amendments are effective prospectively for reporting periods beginning after December 15, 2012. It did not have a material effect on the Company’s results of operations, financial position or disclosures.
	ASU 2012-06 – 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”). When an entity recognizes an indemnification asset and subsequently a change in the cash flows expected to be collected on the indemnification asset occurs as a result of a change in the cash flows expected to be collected on the indemnified asset, ASU 2012-06 requires the entity to recognize the change in the measurement of the indemnification asset on the same basis as the indemnified assets. Any amortization of changes in value of the indemnification asset should be limited to the lesser of the term of the indemnification agreement and the remaining life of the indemnified assets. ASU 2012-06 is effective for fiscal years beginning on or after December 15, 2012, and early adoption is permitted. It is to be applied prospectively to any new indemnification assets acquired after the date of adoption and to indemnification assets existing as of the date of adoption arising from a government-assisted acquisition of a financial institution. ASU 2012-06 did not have a material effect on the Company’s results of operations, financial position or disclosures.
	ASU 2011-04 – Amendments to Achieve Common Fair Value Measurement and Disclosure Requirements in U.S. GAAP and IFRSs (“ASU 2011-04”). ASU 2011-04 generally represents clarifications of Topic 820, but also includes some instances where a particular principle or requirement for measuring fair value or disclosing information about fair value measurements has changed. ASU 2011-04 results in common principles and requirements for measuring fair value and for disclosing information about fair value measurements. ASU 2011-04 was to be applied prospectively and is effective during interim and annual periods beginning after December 15, 2011 for public companies. It did not have a material impact on the Company’s results of operations, financial position or disclosures.
	ASU 2011-05 – Amendments to Topic 220, Comprehensive Income (“ASU 2011-05”). ASU 2011-05 grants an entity the option to present the total of comprehensive income, the components of net income and the components of other comprehensive income either in a single continuous statement of comprehensive income or in two separate but consecutive statements. In both choices, an entity is required to present each component of net income along with total net income, each component of other comprehensive income along with a total for other comprehensive income and a total amount for comprehensive income. ASU 2011-05 eliminates the option to present the components of other comprehensive income as part of the statement of changes in stockholders’ equity. ASU 2011-05 does not change the items that must be reported in other comprehensive income or when an item of other comprehensive income must be reclassified to net income. For public entities, ASU 2011-05 was effective for fiscal years, and interim periods within those years, beginning after December 15, 2011, and was to be adopted retrospectively. It did not have a material impact on the Company’s results of operations, financial position or disclosures.
	ASU 2011-08 – Intangibles – Goodwill and Other (Topic 350) Testing Goodwill for Impairment (“ASU 2011-08”). ASU 2011-08 grants an entity the option to assess qualitative factors to determine whether it is more likely than not that the fair value of a reporting unit is less than its carrying amount. This conclusion can be used as a basis for determining whether it is necessary to perform the two-step goodwill impairment test required in Topic 350. ASU 2011-08 was effective for annual and interim goodwill impairment tests performed for fiscal years beginning after December 15, 2011. It did not have a material impact on the Company’s results of operations, financial position or disclosures.
Fair Value of Financial Instruments	'
	Fair Value of Financial Instruments
	The fair value of a financial instrument is the current amount that would be exchanged between willing parties, other than in a forced liquidation. Fair value is best determined based upon quoted market prices. However, in many instances, there are no quoted market prices for the Company’s various financial instruments. In cases where quoted market prices are not available, fair value is based on discounted cash flows or other valuation techniques. These techniques are significantly affected by the assumptions used, including the discount rate and estimates of future cash flows. Accordingly, the fair value estimates may not be realized in an immediate settlement of the instrument. The accounting standard for disclosures about the fair value of financial instruments excludes certain financial instruments and all nonfinancial instruments from its disclosure requirements. Accordingly, the aggregate fair value amounts presented may not necessarily represent the underlying fair value of the Company.
	The Company has elected to record mortgage loans held-for-sale at fair value in order to eliminate the complexities and inherent difficulties of achieving hedge accounting and to better align reported results with the underlying economic changes in value of the loans and related hedge instruments. This election impacts the timing and recognition of origination fees and costs, as well as servicing value, which are now recognized in earnings at the time of origination. Interest income on mortgage loans held-for-sale is recorded on an accrual basis in the consolidated statement of income under the heading “Interest income – interest and fees on loans”. The servicing value is included in the fair value of the Interest Rate Lock Commitments with borrowers. The mark to market adjustments related to loans held-for-sale and the associated economic hedges are captured in mortgage banking activities.
	The fair value hierarchy describes three levels of inputs that may be used to measure fair value:
	Level 1 – Quoted prices in active markets for identical assets or liabilities.
	Level 2 – Observable inputs other than Level 1 prices, such as quoted prices for similar assets or liabilities; quoted prices in markets that are not active; or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities.
	Level 3 – Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities.
	The following methods and assumptions were used by the Company in estimating the fair value of its financial instruments and other accounts recorded based on their fair value:
Cash and Due from Banks, Federal Funds Sold and Interest-Bearing Accounts	'
	Cash and Due From Banks, Federal Funds Sold and Interest-Bearing Accounts: The carrying amount of cash and due from banks, federal funds sold and interest-bearing accounts approximates fair value.
Investment Securities Available for Sale	'
	Investment Securities Available for Sale: The fair value of securities available for sale is determined by various valuation methodologies. Where quoted market prices are available in an active market, securities are classified within Level 1 of the valuation hierarchy. If quoted market prices are not available, then fair values are estimated by using pricing models, quoted prices of securities with similar characteristics, or discounted cash flows. Level 2 securities include mortgage-backed securities issued by government sponsored enterprises and municipal bonds. The level 2 fair value pricing is provided by an independent third-party and is based upon similar securities in an active market. In certain cases where Level 1 or Level 2 inputs are not available, securities are classified within Level 3 of the hierarchy and include certain residual municipal securities and other less liquid securities.
Other Investments	'
	Other Investments: Federal Home Loan Bank (“FHLB”) stock is included in other investments at its original cost basis, as cost approximates fair value and there is no ready market for such investments.
Mortgage Loans Held for Sale	'
	Mortgage Loans Held for Sale: The fair value of mortgage loans held for sale is determined on outstanding commitments from third party investors in the secondary markets and is classified within Level 2 of the valuation hierarchy.
Loans	'
	Loans: The carrying amount of variable-rate loans that reprice frequently and have no significant change in credit risk approximates fair value. The fair value of fixed-rate loans is estimated based on discounted contractual cash flows, using interest rates currently being offered for loans with similar terms to borrowers with similar credit quality. The fair value of impaired loans is estimated based on discounted expected future cash flows or underlying collateral values, where applicable. A loan is determined to be impaired if the Company believes it is probable that all principal and interest amounts due according to the terms of the loan will not be collected as scheduled. The fair value of impaired loans is determined in accordance with accounting standards and generally results in a specific reserve established through a charge to the provision for loan losses. Losses on impaired loans are charged to the allowance when management believes the uncollectability of a loan is confirmed. Management has determined that the majority of impaired loans are Level 3 assets due to the extensive use of market appraisals. To the extent that market appraisals or other methods do not produce reliable determinations of fair value, these assets are deemed to be Level 3.
Other Real Estate Owned	'
	Other Real Estate Owned: The fair value of other real estate owned (“OREO”) is determined using certified appraisals that value the property at its highest and best uses by applying traditional valuation methods common to the industry. The Company does not hold any OREO for profit purposes and all other real estate is actively marketed for sale. In most cases, management has determined that additional write-downs are required beyond what is calculable from the appraisal to carry the property at levels that would attract buyers. Because this additional write-down is not based on observable inputs, management has determined that other real estate owned should be classified as Level 3.
Covered Assets	'
	Covered Assets: Covered assets include loans and other real estate owned on which the majority of losses would be covered by loss-sharing agreements with the Federal Deposit Insurance Corporation (the “FDIC”). Management initially valued these assets at fair value using mostly unobservable inputs and, as such, has classified these assets as Level 3.
Intangible Assets and Goodwill	'
	Intangible Assets and Goodwill: Intangible assets consist of core deposit premiums acquired in connection with business combinations and are based on the established value of acquired customer deposits. The core deposit premium is initially recognized based on a valuation performed as of the consummation date and is amortized over an estimated useful life of three to ten years. Goodwill represents the excess of the purchase price over the fair value of the net identifiable assets acquired in a business combination. Goodwill and other intangible assets deemed to have an indefinite useful life are not amortized but instead are subject to an annual review for impairment.
FDIC Loss-Share Receivable	'
	FDIC Loss-Share Receivable: Because the FDIC will reimburse the Company for certain acquired loans should the Company experience a loss, an indemnification asset is recorded at fair value at the acquisition date. The indemnification asset is recognized at the same time as the indemnified loans and measured on the same basis, subject to collectability or contractual limitations. The shared-loss agreements on the acquisition date reflect the reimbursements expected to be received from the FDIC, using an appropriate discount rate which reflects counterparty credit risk and other uncertainties. The shared-loss agreements continue to be measured on the same basis as the related indemnified loans, and the loss-share receivable is impacted by changes in estimated cash flows associated with these loans.
Deposits	'
	Deposits: The carrying amount of demand deposits, savings deposits and variable-rate certificates of deposit approximates fair value. The fair value of fixed-rate certificates of deposit is estimated based on discounted contractual cash flows using interest rates currently offered for certificates with similar maturities.
Securities Sold under Agreements to Repurchase and Other Borrowings	'
	Securities Sold under Agreements to Repurchase and Other Borrowings: The carrying amount of variable rate borrowings and securities sold under repurchase agreements approximates fair value. The fair value of fixed rate other borrowings is estimated based on discounted contractual cash flows using the current incremental borrowing rates for similar borrowing arrangements.
Subordinated Deferrable Interest Debentures	'
	Subordinated Deferrable Interest Debentures: The carrying amount of the Company’s variable rate trust preferred securities approximates fair value.
Off-Balance-Sheet Instruments	'
	Off-Balance-Sheet Instruments: Because commitments to extend credit and standby letters of credit are typically made using variable rates and have short maturities, the carrying value and fair value are immaterial for disclosure.
Derivatives	'
	Derivatives: The Company has entered into derivative financial instruments to manage interest rate risk. The valuation of these instruments is determined using widely accepted valuation techniques including discounted cash flow analysis on the expected cash flows of the derivatives. This analysis reflects the contractual terms of the derivative, including the period to maturity, and uses observable market-based inputs, including interest rate curves and implied volatilities. The fair value of the derivatives are determined using the market standard methodology of netting the discounted future fixed cash receipts and the discounted expected variable cash payments. The variable cash payments are based on an expectation of future interest rates (forward curves derived from observable market interest rate curves).
	The Company incorporates credit valuation adjustments to appropriately reflect both its own nonperformance risk and the respective counterparty’s nonperformance risk in the fair value measurements. In adjusting the fair value of its derivative contracts for the effect of nonperformance risk, the Company has considered the impact of netting any applicable credit enhancements such as collateral postings, thresholds, mutual puts and guarantees.
	Although the Company has determined that the majority of the inputs used to value its derivative fall within Level 2 of the fair value hierarchy, the credit valuation adjustments associated with its derivatives utilize Level 3 inputs, such as estimates of current credit spreads to evaluate the likelihood of default by itself or the counterparty. However, as of September 30, 2013, December 31, 2012 and September 30, 2012, the Company has assessed the significance of the impact of the credit valuation adjustments on the overall valuation of its derivative positions and has determined that the credit valuation adjustment is not significant to the overall valuation of its derivatives. As a result, the Company has determined that its derivative valuation in its entirety is classified in Level 2 of the fair value hierarchy.
Deteriorated Loans Transferred Policy	'
	FASB ASC 310 – 30, Loans and Debt Securities Acquired with Deteriorated Credit Quality (“ASC 310”), applies to a loan with evidence of deterioration of credit quality since origination, acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable. ASC 310 prohibits carrying over or creating an allowance for loan losses upon initial recognition for loans which fall under the scope of this statement. At the acquisition dates, a majority of these loans were valued based on the liquidation value of the underlying collateral because the future cash flows are primarily based on the liquidation of underlying collateral. There was no allowance for credit losses established related to these ASC 310 loans at the acquisition dates, based on the provisions of this statement. Over the life of the acquired loans, the Company continues to estimate cash flows expected to be collected. If the expected cash flows expected to be collected increases, then the Company adjusts the amount of accretable discount recognized on a prospective basis over the loan’s remaining life. If the expected cash flows expected to be collected decreases, then the Company records a provision for loan loss in its consolidated statement of operations.

Basis_of_Presentation_and_Acco2

Basis of Presentation and Accounting Policies (Tables)	9 Months Ended
	Sep. 30, 2013
Accounting Policies [Abstract]	'
Carrying Amount and Estimated Fair Value of Financial Instruments	'
	The carrying amount and estimated fair value of the Company’s financial instruments, not shown elsewhere in these financial statements, were as follows:
				Fair Value Measurements at
				September 30, 2013 Using:
		Carrying		Level 1			Level 2			Level 3			Total
		Amount
		(Dollars in Thousands)
	Financial assets:
	Loans, net	$	1,983,062	$	—		$	1,561,480		$	461,213		$	2,022,693
	Financial liabilities:
	Deposits		2,443,421		—			2,444,244			—			2,444,244
				Fair Value Measurements at
				December 31, 2012 Using:
		Carrying		Level 1			Level 2			Level 3			Total
		Amount
		(Dollars in Thousands)
	Financial assets:
	Loans, net	$	1,934,754	$	—		$	1,406,366		$	560,226		$	1,966,592
	Financial liabilities:
	Deposits		2,624,663		—			2,624,883			—			2,624,883
				Fair Value Measurements at
				September 30, 2012 Using:
		Carrying		Level 1			Level 2			Level 3			Total
		Amount
		(Dollars in Thousands)
	Financial assets:
	Loans, net	$	1,960,195	$	—		$	1,393,115		$	596,671		$	1,989,786
	Financial liabilities:
	Deposits		2,580,117		—			2,581,465			—			2,581,465
Fair Value Measurements of Assets and Liabilities Measured on Recurring Basis	'
	The following table presents the fair value measurements of assets and liabilities measured at fair value on a recurring basis and the level within the fair value hierarchy in which the fair value measurements fall as of September 30, 2013, December 31, 2012 and September 30, 2012 (dollars in thousands):
		Fair Value Measurements on a Recurring Basis
		As of September 30, 2013
		Fair Value		Quoted Prices			Significant			Significant
				in Active			Other			Unobservable
				Markets for			Observable			Inputs
				Identical			Inputs			(Level 3)
				Assets			(Level 2)
				(Level 1)
	U.S. government agencies	$	13,917	$	—		$	13,917		$	—
	State, county and municipal securities		112,939		4,460			108,479			—
	Corporate debt securities		9,738		—			7,738			2,000
	Mortgage-backed securities		175,654		9,375			166,279			—
	Mortgage loans held for sale		69,634		—			69,634			—
	Total recurring assets at fair value	$	381,882	$	13,835		$	366,047		$	2,000
	Derivative financial instruments	$	972	$	—		$	972		$	—
	Total recurring liabilities at fair value	$	972	$	—		$	972		$	—
		Fair Value Measurements on a Recurring Basis
		As of December 31, 2012
		Fair Value		Quoted Prices			Significant			Significant
				in Active			Other			Unobservable
				Markets for			Observable			Inputs
				Identical			Inputs			(Level 3)
				Assets			(Level 2)
				(Level 1)
	U.S. government agencies	$	6,870	$	—		$	6,870		$	—
	State, county and municipal securities		114,390		4,854			109,536			—
	Corporate debt securities		10,328		—			8,328			2,000
	Mortgage-backed securities		215,321		23,893			191,428			—
	Mortgage loans held for sale		48,786		—			48,786			—
	Total recurring assets at fair value	$	395,695	$	28,747		$	364,948		$	2,000
	Derivative financial instruments	$	2,978	$	—		$	2,978		$	—
	Total recurring liabilities at fair value	$	2,978	$	—		$	2,978		$	—
		Fair Value Measurements on a Recurring Basis
		As of September 30, 2012
		Fair Value		Quoted Prices			Significant			Significant
				in Active			Other			Unobservable
				Markets for			Observable			Inputs
				Identical			Inputs			(Level 3)
				Assets			(Level 2)
				(Level 1)
	U.S. government agencies	$	8,895	$	—		$	8,895		$	—
	State, county and municipal securities		111,742		6,932			104,810			—
	Corporate debt securities		11,495		—			9,495			2,000
	Mortgage-backed securities		228,919		1,965			226,954			—
	Mortgage loans held for sale		29,021		—			29,021			—
	Total recurring assets at fair value	$	390,072	$	8,897		$	379,175		$	2,000
	Derivative financial instruments	$	3,233	$	—		$	3,233		$	—
	Total recurring liabilities at fair value	$	3,233	$	—		$	3,233		$	—
Valuation Methodologies for Instruments Measured at Fair Value on Nonrecurring Basis	'
	The following table is a presentation of the valuation methodologies used for instruments measured at fair value on a nonrecurring basis, as well as the general classification of such instruments pursuant to the valuation hierarchy as of September 30, 2013, December 31, 2012 and September 30, 2012 (dollars in thousands):
		Fair Value Measurements on a Nonrecurring Basis
		As of September 30, 2013
		Fair Value		Level 1			Level 2			Level 3
	Impaired loans carried at fair value	$	43,564	$	—		$	—		$	43,564
	Other real estate owned		37,978		—			—			37,978
	Covered loans		417,649		—			—			417,649
	Covered other real estate owned		52,552		—			—			52,552
	Total non-recurring assets at fair value	$	551,743	$	—		$	—		$	551,743
		Fair Value Measurements on a Nonrecurring Basis
		As of December 31, 2012
		Fair Value		Level 1			Level 2			Level 3
	Impaired loans carried at fair value	$	52,514	$	—		$	—		$	52,514
	Other real estate owned		39,850		—			—			39,850
	Covered loans		507,712		—			—			507,712
	Covered other real estate owned		88,273		—			—			88,273
	Total nonrecurring assets at fair value	$	688,349	$	—		$	—		$	688,349
		Fair Value Measurements on a Nonrecurring Basis
		As of September 30, 2012
		Fair Value		Level 1			Level 2			Level 3
	Impaired loans carried at fair value	$	50,437	$	—		$	—		$	50,437
	Other real estate owned		37,325		—			—			37,325
	Covered loans		546,234		—			—			546,234
	Covered other real estate owned		88,895		—			—			88,895
	Total nonrecurring assets at fair value	$	722,891	$	—		$	—		$	722,891
Summary of Significant Unobservable Inputs Used in Fair Value Measurement of Level 3 Assets and Liabilities	'
	The following table shows significant unobservable inputs used in the fair value measurement of Level 3 assets and liabilities.
	Measurements	Fair Value at		Valuation Technique		Unobservable Inputs	Range
		September 30, 2013
	(Dollars in Thousands)
	Nonrecurring:
	Impaired loans	$	43,564	Third party appraisals and		Collateral discounts and	4.00% - 75.00%
				discounted cash flows		discount rates
	Other real estate owned		37,978	Third party appraisals		Collateral discounts and	10.00% - 78.00%
						estimated costs to sell
	Covered loans		417,649	Third party appraisals and		Collateral discounts	1.75% - 75.00%
				discounted cash flows		Discount rate
	Covered real estate owned		52,552	Third party appraisals		Collateral discounts and	10.00% - 84.00%
						estimated costs to sell
	Recurring:
	Investment securities available for sale		2,000	Discounted par values		Credit quality of	0.00%
						underlying issuer
Schedule of Company's Reconciliation of Level 3 Assets	'
	These transfers are reflected in Ameris’ reconciliation of Level 3 assets below.
		Investment		Impaired			Other Real			Covered			Covered
		Securities		Loans			Estate			Loans			Other
		Available		Carried at			Owned						Real Estate
		for		Fair Value									Owned
		Sale
		(Dollars in Thousands)
	Beginning balance, January 1, 2013	$	2,000	$	52,514		$	39,850		$	507,712		$	88,273
	Total gains/(losses) included in net income		—		—			(2,214	)		—			(3,432	)
	Purchases, sales, issuances, and settlements, net		—		(621	)		(7,987	)		(61,338	)		(61,014	)
	Transfers in to Level 3		—		—			—			—			—
	Asset reclassification, within Level 3		—		(8,329	)		8,329			(28,725	)		28,725
	Ending balance September 30, 2013	$	2,000	$	43,564		$	37,978		$	417,649		$	52,552
		Investment		Impaired			Other Real			Covered			Covered
		Securities		Loans			Estate			Loans			Other
		Available		Carried at			Owned						Real Estate
		for		Fair Value									Owned
		Sale
		(Dollars in Thousands)
	Beginning balance, January 1, 2012	$	2,000	$	70,296		$	46,680		$	571,489		$	78,617
	Total gains/(losses) included in net income		—		—			(9,048	)		—			—
	Purchases, sales, issuances, and settlements, net		—		—			(21,008	)		15,281			(30,258	)
	Transfers in to Level 3		—		842			—			—			—
	Asset reclassification, within Level 3		—		(20,701	)		20,701			(40,536	)		40,536
	Ending balance September 30, 2012	$	2,000	$	50,437		$	37,325		$	546,234		$	88,895

Investment_Securities_Tables

Investment Securities (Tables)	9 Months Ended
	Sep. 30, 2013
Investments Debt And Equity Securities [Abstract]	'
Amortized Cost and Estimated Fair Value of Investment Securities Available for Sale	'
	The amortized cost and estimated fair value of investment securities available for sale at September 30, 2013, December 31, 2012 and September 30, 2012 are presented below:
		Amortized		Gross			Gross			Fair
		Cost		Unrealized			Unrealized			Value
				Gains			Losses
		(Dollars in Thousands)
	September 30, 2013:
	U. S. government agencies	$	14,945	$	—		$	(1,028	)	$	13,917
	State, county and municipal securities		112,643		2,331			(2,035	)		112,939
	Corporate debt securities		10,314		280			(856	)		9,738
	Mortgage-backed securities		176,818		2,714			(3,878	)		175,654
	Total securities	$	314,720	$	5,325		$	(7,797	)	$	312,248
	December 31, 2012:
	U. S. government agencies	$	6,605	$	271		$	(6	)	$	6,870
	State, county and municipal securities		109,736		4,864			(210	)		114,390
	Corporate debt securities		10,545		330			(547	)		10,328
	Mortgage-backed securities		209,824		5,701			(204	)		215,321
	Total securities	$	336,710	$	11,166		$	(967	)	$	346,909
	September 30, 2012:
	U. S. government agencies	$	8,606	$	289		$	—		$	8,895
	State, county and municipal securities		106,541		5,345			(144	)		111,742
	Corporate debt securities		11,793		262			(560	)		11,495
	Mortgage-backed securities		222,641		6,562			(284	)		228,919
	Total securities	$	349,581	$	12,458		$	(988	)	$	361,051
Amortized Cost and Fair Value of Available-for-Sale Securities by Contractual Maturity	'
	The amortized cost and fair value of available-for-sale securities at September 30, 2013 by contractual maturity are summarized in the table below. Expected maturities for mortgage-backed securities may differ from contractual maturities because in certain cases borrowers can prepay obligations without prepayment penalties. Therefore, these securities are not included in the following maturity summary:
		Amortized		Fair
		Cost		Value
		(Dollars in Thousands)
	Due in one year or less	$	2,214	$	2,229
	Due from one year to five years		36,699		37,826
	Due from five to ten years		68,790		67,622
	Due after ten years		30,199		28,917
	Mortgage-backed securities		176,818		175,654
		$	314,720	$	312,248
Schedule of Gross Unrealized Losses and Fair Value of Securities	'
	The following table details the gross unrealized losses and fair value of securities aggregated by category and duration of continuous unrealized loss position at September 30, 2013, December 31, 2012 and September 30, 2012.
		Less Than 12 Months					12 Months or More						Total
	Description of Securities	Fair		Unrealized			Fair			Unrealized			Fair		Unrealized
		Value		Losses			Value			Losses			Value		Losses
		(Dollars in Thousands)
	September 30, 2013:
	U. S. government agencies	$	13,917	$	(1,028	)	$	—		$	—		$	13,917	$	(1,028	)
	State, county and municipal securities		46,516		(1,735	)		3,807			(300	)		50,323		(2,035	)
	Corporate debt securities		—		—			4,235			(856	)		4,235		(856	)
	Mortgage-backed securities		90,639		(3,878	)		—			—			90,639		(3,878	)
	Total temporarily impaired securities	$	151,072	$	(6,641	)	$	8,042		$	(1,156	)	$	159,114	$	(7,797	)
	December 31, 2012:
	U. S. government agencies	$	4,994	$	(6	)	$	—		$	—		$	4,994	$	(6	)
	State, county and municipal securities		15,595		(199	)		505			(11	)		16,100		(210	)
	Corporate debt securities		—		—			4,560			(547	)		4,560		(547	)
	Mortgage-backed securities		23,951		(181	)		3,617			(23	)		27,568		(204	)
	Total temporarily impaired securities	$	44,540	$	(386	)	$	8,682		$	(581	)	$	53,222	$	(967	)
	September 30, 2012:
	U. S. government agencies	$	—	$	—		$	—		$	—		$	—	$	—
	State, county and municipal securities		14,653		(132	)		505			(12	)		15,158		(144	)
	Corporate debt securities		—		—			5,551			(560	)		5,551		(560	)
	Mortgage-backed securities		32,660		(267	)		3,434			(17	)		36,094		(284	)
	Total temporarily impaired securities	$	47,313	$	(399	)	$	9,490		$	(589	)	$	56,803	$	(988	)

Loans_Tables

Loans (Tables)	9 Months Ended
	Sep. 30, 2013
Schedule of Accounts Notes Loans and Financial Receivables	'
	Balances within the major loans receivable categories are presented in the following table:
	(Dollars in Thousands)	September 30,				December 31,			September 30,
		2013				2012			2012
	Commercial, financial and agricultural	$	244,991			$	174,217		$	189,374
	Real estate – construction and development		132,277				114,199			125,315
	Real estate – commercial and farmland		799,149				732,322			713,240
	Real estate – residential		355,920				346,480			343,332
	Consumer installment		36,303				40,178			43,441
	Other		20,627				43,239			25,160
		$	1,589,267			$	1,450,635		$	1,439,862
Summary of Covered Loans According to Loan Type	'
	Covered loans are shown below according to loan type as of the end of the periods shown:
	(Dollars in Thousands)	September 30,				December 31,			September 30,
		2013				2012			2012
	Commercial, financial and agricultural	$	27,768			$	32,606		$	37,167
	Real estate – construction and development		50,702				70,184			73,356
	Real estate – commercial and farmland		237,086				278,506			298,903
	Real estate – residential		101,146				125,056			135,154
	Consumer installment		947				1,360			1,654
		$	417,649			$	507,712		$	546,234
Summary of Trouble Debt Restructuring by Loan Class	'
	The following table presents the amount of troubled debt restructurings by loan class, classified separately as accrual and non-accrual at September 30, 2013, December 31, 2012 and September 30, 2012:
	As of September 30, 2013	Accruing Loans						Non-Accruing Loans
				Balance					Balance
	Loan class:	#		(in thousands)				#	(in thousands)
	Commercial, financial & agricultural	4		$	521			3	$	533
	Real estate – construction & development	8			1,926			1		29
	Real estate – commercial & farmland	16			6,693			3		1,858
	Real estate – residential	35			7,871			7		704
	Consumer installment	1			13			2		26
	Total	64		$	17,024			16	$	3,150
	As of December 31, 2012	Accruing Loans						Non-Accruing Loans
				Balance					Balance
	Loan class:	#		(in thousands)				#	(in thousands)
	Commercial, financial & agricultural	5		$	802			—	$	—
	Real estate – construction & development	5			1,735			—		—
	Real estate – commercial & farmland	16			8,947			3		4,149
	Real estate – residential	28			7,254			2		1,022
	Consumer installment	1			6			—		—
	Total	55		$	18,744			5	$	5,171
	As of September 30, 2012	Accruing Loans						Non-Accruing Loans
				Balance					Balance
	Loan class:	#		(in thousands)				#	(in thousands)
	Commercial, financial & agricultural	5		$	804			—	$	—
	Real estate – construction & development	4			1,481			—		—
	Real estate – commercial & farmland	15			9,540			1		2,770
	Real estate – residential	27			8,068			2		620
	Total	51		$	19,893			3	$	3,390
Summary of Troubled Debt Restructuring by Loan Class	'
	The following table presents the amount of troubled debt restructurings by loan class, classified separately as those currently paying under restructured terms and those that have defaulted under restructured terms at September 30, 2013, December 31, 2012 and September 30, 2012:
	As of September 30, 2013	Loans Currently Paying						Loans that have Defaulted
		Under Restructured						Under Restructured
		Terms						Terms
				Balance					Balance
	Loan class:	#		(in thousands)				#	(in thousands)
	Commercial, financial & agricultural	3		$	508			4	$	546
	Real estate – construction & development	6			1,881			3		74
	Real estate – commercial & farmland	14			6,550			5		2,001
	Real estate – residential	31			7,282			11		1,293
	Consumer installment	2			37			1		2
	Total	56		$	16,258			24	$	3,916
	As of December 31, 2012	Loans Currently Paying						Loans that have Defaulted
		Under Restructured						Under Restructured
		Terms						Terms
				Balance					Balance
	Loan class:	#		(in thousands)				#	(in thousands)
	Commercial, financial & agricultural	5		$	802			—	$	—
	Real estate – construction & development	5			1,735			—		—
	Real estate – commercial & farmland	16			8,947			3		4,149
	Real estate – residential	28			7,254			2		1,022
	Consumer installment	—			—			1		6
	Total	54		$	18,738			6	$	5,177
	As of September 30, 2012	Loans Currently Paying						Loans that have Defaulted
		Under Restructured						Under Restructured
		Terms						Terms
				Balance					Balance
	Loan class:	#		(in thousands)				#	(in thousands)
	Commercial, financial & agricultural	5		$	804			—	$	—
	Real estate – construction & development	4			1,481			—		—
	Real estate – commercial & farmland	15			9,540			1		2,770
	Real estate – residential	26			8,068			3		620
	Total	50		$	19,893			4	$	3,390
Summary of Troubled Debt Restructuring by Concessions Made Types	'
	The following table presents the amount of troubled debt restructurings by types of concessions made, classified separately as accrual and non-accrual at September 30, 2013, December 31, 2012 and September 30, 2012:
	As of September 30, 2013	Accruing Loans						Non-Accruing Loans
				Balance					Balance
	Type of concession:	#		(in thousands)				#	(in thousands)
	Forbearance of interest	9		$	2,135			2	$	101
	Forgiveness of principal	3			1,479			1		145
	Payment modification only	2			370			—		—
	Rate reduction only	14			7,146			2		496
	Rate reduction, forbearance of interest	18			2,878			10		2,379
	Rate reduction, forbearance of principal	18			3,016			—		—
	Rate reduction, payment modification	—			—			1		29
	Total	64		$	17,024			16	$	3,150
	As of December 31, 2012	Accruing Loans						Non-Accruing Loans
				Balance					Balance
	Type of concession:	#		(in thousands)				#	(in thousands)
	Forbearance of interest	2		$	1,873			—	$	—
	Forgiveness of principal	3			1,518			1		372
	Payment modification only	2			376			—		—
	Rate reduction only	11			7,075			1		177
	Rate reduction, forbearance of interest	18			4,061			2		3,420
	Rate reduction, forbearance of principal	18			3,798			—		—
	Rate reduction, payment modification	1			43			1		1,202
	Total	55		$	18,744			5	$	5,171
	As of September 30, 2012	Accruing Loans						Non-Accruing Loans
				Balance					Balance
	Type of concession:	#		(in thousands)				#	(in thousands)
	Forbearance of interest	2		$	1,902			—	$	—
	Forgiveness of principal	3			1,516			1		369
	Payment modification only	2			1,292			1		251
	Rate reduction only	10			5,889			—		—
	Rate reduction, forbearance of interest	15			4,371			1		2,770
	Rate reduction, forbearance of principal	18			4,874			—		—
	Rate reduction, payment modification	1			49			—		—
	Total	51		$	19,893			3	$	3,390
Summary of Troubled Debt Restructurings by Collateral Types	'
	The following table presents the amount of troubled debt restructurings by collateral types, classified separately as accrual and non-accrual at September 30, 2013, December 31, 2012 and September 30, 2012:
	As of September 30, 2013	Accruing Loans						Non-Accruing Loans
				Balance					Balance
	Collateral type:	#		(in thousands)				#	(in thousands)
	Warehouse	3		$	1,065			1	$	176
	Raw land	3			1,337			1		29
	Agricultural land	2			380			—		—
	Hotel & motel	3			2,219			—		—
	Office	4			1,924			—		—
	Retail, including strip centers	4			1,105			2		1,682
	1-4 family residential	40			8,460			7		704
	Life insurance policy	1			250			—		—
	Automobile/equipment/inventory	3			36			4		509
	Unsecured	1			248			1		50
	Total	64		$	17,024			16	$	3,150
	As of December 31, 2012	Accruing Loans						Non-Accruing Loans
				Balance					Balance
	Collateral type:	#		(in thousands)				#	(in thousands)
	Warehouse	3		$	1,692			1	$	177
	Raw land	2			1,337			—		—
	Hotel & motel	3			2,318			—		—
	Office	4			2,105			1		2,770
	Retail, including strip centers	6			2,833			1		1,202
	1-4 family residential	31			7,651			2		1,022
	Life insurance policy	1			250			—		—
	Automobile/equipment/inventory	4			508			—		—
	Unsecured	1			50			—		—
	Total	55		$	18,744			5	$	5,171
	As of September 30, 2012	Accruing Loans						Non-Accruing Loans
				Balance					Balance
	Collateral type:	#		(in thousands)				#	(in thousands)
	Warehouse	3		$	1,621			—	$	—
	Raw land	2			1,349			—		—
	Hotel & motel	3			2,362			—		—
	Office	2			1,503			1		2,770
	Retail, including strip centers	7			4,054			—		—
	1-4 family residential	30			8,216			2		620
	Inventory	1			450			—		—
	Equipment	1			38			—		—
	Unsecured	2			300			—		—
	Total	51		$	19,893			3	$	3,390
Schedule of Allowances for Loan Losses by Portfolio Segment	'
	The following table details activity in the allowance for loan losses by portfolio segment for the nine months ended September 30, 2013, the year ended December 31, 2012 and the nine months ended September 30, 2012. Allocation of a portion of the allowance to one category of loans does not preclude its availability to absorb losses in other categories.
		Commercial,				Real estate -			Real estate -			Real estate -			Consumer			Total
		financial &				construction &			commercial &			residential			installment
		agricultural				development			farmland						loans and
															Other
		(Dollars in Thousands)
	Balance, January 1, 2013	$	2,439			$	5,343		$	9,157		$	5,898		$	756		$	23,593
	Provision for loan losses		1,011				2,127			2,632			2,966			11			8,747
	Loans charged off		(1,216	)			(1,598	)		(2,873	)		(3,430	)		(576	)		(9,693	)
	Recoveries of loans previously charged off		340				88			18			520			241			1,207
	Balance, September 30, 2013	$	2,574			$	5,960		$	8,934		$	5,954		$	432		$	23,854
	Period-end amount allocated to:
	Loans individually evaluated for impairment	$	741			$	682		$	1,997		$	1,429		$	—		$	4,849
	Loans collectively evaluated for impairment		1,833				5,278			6,937			4,525			432			19,005
	Ending balance	$	2,574			$	5,960		$	8,934		$	5,954		$	432		$	23,854
	Loans:
	Individually evaluated for impairment	$	3,657			$	3,524		$	14,605		$	16,919		$	—		$	38,705
	Collectively evaluated for impairment		241,334				128,753			784,544			339,001			56,930			1,550,562
	Ending balance	$	244,991			$	132,277		$	799,149		$	355,920		$	56,930		$	1,589,267
		Commercial,				Real estate -			Real estate -			Real estate -			Consumer			Total
		financial &				construction &			commercial &			residential			installment
		agricultural				development			farmland						loans and
															Other
		(Dollars in Thousands)
	Balance, January 1, 2012	$	2,918			$	9,438		$	14,226		$	8,128		$	446		$	35,156
	Provision for loan losses		815				5,245			15,000			6,267			1,124			28,451
	Loans charged off		(1,451	)			(9,380	)		(20,551	)		(8,722	)		(1,059	)		(41,163	)
	Recoveries of loans previously charged off		157				40			482			225			245			1,149
	Balance, December 31, 2012	$	2,439			$	5,343		$	9,157		$	5,898		$	756		$	23,593
	Period-end amount allocated to:
	Loans individually evaluated for impairment	$	659			$	611		$	2,228		$	1,056		$	—		$	4,554
	Loans collectively evaluated for impairment		1,780				4,732			6,929			4,842			756			19,039
	Ending balance	$	2,439			$	5,343		$	9,157		$	5,898		$	756		$	23,593
	Loans:
	Individually evaluated for impairment	$	3,351			$	7,617		$	21,332		$	13,020		$	—		$	45,320
	Collectively evaluated for impairment		170,866				106,582			710,990			333,460			83,417			1,405,315
	Ending balance	$	174,217			$	114,199		$	732,322		$	346,480		$	83,417		$	1,450,635
		Commercial,				Real estate -			Real estate -			Real estate -			Consumer			Total
		financial &				construction &			commercial &			residential			installment
		agricultural				development			farmland						loans and
															Other
		(Dollars in Thousands)
	Balance, January 1, 2012	$	2,918			$	9,438		$	14,226		$	8,128		$	446		$	35,156
	Provision for loan losses		677				4,954			13,087			4,936			706			24,360
	Loans charged off		(889	)			(7,819	)		(18,199	)		(6,642	)		(618	)		(34,167	)
	Recoveries of loans previously charged off		101				23			32			199			197			552
	Balance, September 30, 2012	$	2,807			$	6,596		$	9,146		$	6,621		$	731		$	25,901
	Period-end amount allocated to:
	Loans individually evaluated for impairment	$	610			$	526		$	2,315		$	2,105		$	—		$	5,556
	Loans collectively evaluated for impairment		2,197				6,070			6,831			4,516			731			20,345
	Ending balance	$	2,807			$	6,596		$	9,146		$	6,621		$	731		$	25,901
	Loans:
	Individually evaluated for impairment	$	2,748			$	5,510		$	21,552		$	15,178		$	—		$	44,988
	Collectively evaluated for impairment		186,626				119,805			691,688			328,154			68,601			1,394,874
	Ending balance	$	189,374			$	125,315		$	713,240		$	343,332		$	68,601		$	1,439,862
Non-Covered Loan [Member]	'
Summary of Financial Receivable Nonaccrual Basis	'
	The following table presents an analysis of non-covered loans accounted for on a nonaccrual basis:
	(Dollars in Thousands)	September 30,				December 31,			September 30,
		2013				2012			2012
	Commercial, financial and agricultural	$	4,198			$	4,138		$	4,285
	Real estate – construction and development		4,229				9,281			8,201
	Real estate – commercial and farmland		9,548				11,962			11,408
	Real estate – residential		13,303				12,595			13,236
	Consumer installment		442				909			1,095
		$	31,720			$	38,885		$	38,225
Summary of Past Due Financial Receivables	'
	The following table presents an aging analysis of non-covered loans as of September 30, 2013, December 31, 2012 and September 30, 2012.
		Loans				Loans			Loans 90			Total			Current			Total			Loans 90
		30-59				60-89			or More			Loans			Loans			Loans			Days or
		Days Past				Days			Days Past			Past Due									More Past
		Due				Past Due			Due												Due and
																					Still
																					Accruing
		(Dollars in Thousands)
	As of September 30, 2013:
	Commercial, financial & agricultural	$	623			$	297		$	4,107		$	5,027		$	239,964		$	244,991		$	—
	Real estate – construction & development		1,200				794			4,229			6,223			126,054			132,277			—
	Real estate – commercial & farmland		3,883				2,458			9,523			15,864			783,285			799,149			—
	Real estate – residential		5,515				3,531			11,818			20,864			335,056			355,920			—
	Consumer installment loans		497				255			327			1,079			35,224			36,303			—
	Other		—				—			—			—			20,627			20,627			—
	Total	$	11,718			$	7,335		$	30,004		$	49,057		$	1,540,210		$	1,589,267		$	—
		Loans				Loans			Loans 90			Total			Current			Total			Loans 90
		30-59				60-89			or More			Loans			Loans			Loans			Days or
		Days Past				Days			Days Past			Past Due									More Past
		Due				Past Due			Due												Due and
																					Still
																					Accruing
		(Dollars in Thousands)
	As of December 30, 2012:
	Commercial, financial & agricultural	$	258			$	312		$	3,969		$	4,539		$	169,678		$	174,217		$	—
	Real estate – construction & development		347				332			8,969			9,648			104,551			114,199			—
	Real estate – commercial & farmland		2,867				2,296			9,544			14,707			717,615			732,322			—
	Real estate – residential		7,651				2,766			10,990			21,407			325,073			346,480			—
	Consumer installment loans		702				391			815			1,908			38,270			40,178			—
	Other		—				—			—			—			43,239			43,239			—
	Total	$	11,825			$	6,097		$	34,287		$	52,209		$	1,398,426		$	1,450,635		$	—
		Loans				Loans			Loans 90			Total			Current			Total			Loans 90
		30-59				60-89			or More			Loans			Loans			Loans			Days or
		Days Past				Days			Days Past			Past Due									More Past
		Due				Past Due			Due												Due and
																					Still
																					Accruing
		(Dollars in Thousands)
	As of September 30, 2012:
	Commercial, financial & agricultural	$	1,192			$	639		$	3,786		$	5,617		$	183,757		$	189,374		$	—
	Real estate – construction & development		518				152			8,180			8,850			116,465			125,315			—
	Real estate – commercial & farmland		3,507				812			11,402			15,721			697,519			713,240			—
	Real estate – residential		7,200				2,346			12,372			21,918			321,414			343,332			—
	Consumer installment loans		687				284			993			1,964			41,477			43,441			—
	Other		—				—			—			—			25,160			25,160			—
	Total	$	13,104			$	4,233		$	36,733		$	54,070		$	1,385,792		$	1,439,862		$	—
Summary of Impaired Financial Receivables	'
	The following is a summary of information pertaining to non-covered impaired loans:
		As of and For the Period Ended
		September 30,				December 31,			September 30,
		2013				2012			2012
		(Dollars in Thousands)
	Nonaccrual loans	$	31,720			$	38,885		$	38,225
	Troubled debt restructurings not included above		17,024				18,744			19,893
	Total impaired loans	$	48,744			$	57,629		$	58,118
	Impaired loans not requiring a related allowance	$	—			$	—		$	—
	Impaired loans requiring a related allowance	$	48,744			$	57,629		$	58,118
	Allowance related to impaired loans	$	5,180			$	5,115		$	7,681
	Average investment in impaired loans	$	53,047			$	70,209		$	73,353
	Interest income recognized on impaired loans	$	468			$	495		$	376
	Foregone interest income on impaired loans	$	388			$	718		$	491
	The following table presents an analysis of information pertaining to non-covered impaired loans as of September 30, 2013, December 31, 2012 and September 30, 2012.
		Unpaid				Recorded			Recorded			Total			Related			Average
		Contractual				Investment			Investment			Recorded			Allowance			Recorded
		Principal				With No			With			Investment						Investment
		Balance				Allowance			Allowance
		(Dollars in Thousands)
	As of September 30, 2013:
	Commercial, financial & agricultural	$	7,401			$	—		$	4,719		$	4,719		$	820		$	4,900
	Real estate – construction & development		14,299				—			6,155			6,155			821			8,960
	Real estate – commercial & farmland		18,628				—			16,241			16,241			1,999			18,079
	Real estate – residential		24,701				—			21,174			21,174			1,530			20,427
	Consumer installment loans		565				—			455			455			10			681
	Total	$	65,594			$	—		$	48,744		$	48,744		$	5,180		$	53,047
		Unpaid				Recorded			Recorded			Total			Related			Average
		Contractual				Investment			Investment			Recorded			Allowance			Recorded
		Principal				With No			With			Investment						Investment
		Balance				Allowance			Allowance
		(Dollars in Thousands)
	As of December 31, 2012:
	Commercial, financial & agricultural	$	8,024			$	—		$	4,940		$	4,940		$	743		$	4,968
	Real estate – construction & development		20,316				—			11,016			11,016			910			11,706
	Real estate – commercial & farmland		25,076				—			20,910			20,910			2,191			30,638
	Real estate – residential		24,155				—			19,848			19,848			1,246			21,813
	Consumer installment loans		1,187				—			915			915			25			1,084
	Total	$	78,758			$	—		$	57,629		$	57,629		$	5,115		$	70,209
		Unpaid				Recorded			Recorded			Total			Related			Average
		Contractual				Investment			Investment			Recorded			Allowance			Recorded
		Principal				With No			With			Investment						Investment
		Balance				Allowance			Allowance
		(Dollars in Thousands)
	As of September 30, 2012:
	Commercial, financial & agricultural	$	8,261			$	—		$	5,089		$	5,089		$	876		$	4,974
	Real estate – construction & development		19,583				—			9,682			9,682			1,253			11,879
	Real estate – commercial & farmland		25,346				—			20,948			20,948			2,907			33,070
	Real estate – residential		24,993				—			21,304			21,304			2,616			22,303
	Consumer installment loans		1,220				—			1,095			1,095			29			1,127
	Total	$	79,403			$	—		$	58,118		$	58,118		$	7,681		$	73,353
Summary of Credit Quality Indicate Financial Receivable	'
	The following table presents the non-covered loan portfolio by risk grade as of September 30, 2013.
	Risk	Commercial,				Real estate -			Real estate -			Real estate -			Consumer			Other			Total
	Grade	financial &				construction &			commercial &			residential			installment loans
		agricultural				development			farmland
		(Dollars in Thousands)
	10	$	65,033			$	—		$	278		$	420		$	7,028		$	—		$	72,759
	15		20,668				5,080			147,355			56,464			1,243			—			230,810
	20		89,216				37,765			421,669			142,186			19,691			20,627			731,154
	23		97				7,085			10,054			13,275			218			—			30,729
	25		60,407				72,942			183,371			109,604			7,034			—			433,358
	30		3,019				2,264			12,089			11,427			153			—			28,952
	40		6,326				7,141			24,333			22,534			936			—			61,270
	50		225				—			—			10			—			—			235
	60		—				—			—			—			—			—			—
	Total	$	244,991			$	132,277		$	799,149		$	355,920		$	36,303		$	20,627		$	1,589,267
	The following table presents the non-covered loan portfolio by risk grade as of December 31, 2012.
	Risk	Commercial,				Real estate -			Real estate -			Real estate -			Consumer			Other			Total
	Grade	financial &				construction &			commercial &			residential			installment loans
		agricultural				development			farmland
		(Dollars in Thousands)
	10	$	24,623			$	—		$	309		$	464		$	7,597		$	—		$	32,993
	15		11,316				4,373			147,966			71,254			1,591			—			236,500
	20		79,522				31,413			351,997			114,418			21,361			43,239			641,950
	23		42				8,521			9,012			13,788			70			—			31,433
	25		49,071				52,577			176,395			113,591			7,576			—			399,210
	30		2,343				3,394			19,401			9,672			488			—			35,298
	40		7,200				13,765			27,242			23,292			1,495			—			72,994
	50		100				156			—			1			—			—			257
	60		—				—			—			—			—			—			—
	Total	$	174,217			$	114,199		$	732,322		$	346,480		$	40,178		$	43,239		$	1,450,635
	The following table presents the non-covered loan portfolio by risk grade as of September 30, 2012.
	Risk	Commercial,				Real estate -			Real estate -			Real estate -			Consumer			Other			Total
	Grade	financial &				construction &			commercial &			residential			installment loans
		agricultural				development			farmland
		(Dollars in Thousands)
	10	$	26,291			$	—		$	220		$	411		$	7,887		$	—		$	34,809
	15		11,816				4,532			152,678			74,040			1,400			—			244,466
	20		80,681				33,603			324,270			105,531			23,038			25,160			592,283
	23		5				7,667			8,773			13,650			81			—			30,176
	25		62,377				59,013			184,146			113,560			8,502			—			427,598
	30		1,508				7,948			14,742			10,535			745			—			35,478
	40		6,436				12,396			28,411			25,583			1,780			—			74,606
	50		260				156			—			22			8			—			446
	60		—				—			—			—			—			—			—
	Total	$	189,374			$	125,315		$	713,240		$	343,332		$	43,441		$	25,160		$	1,439,862
Covered Loans [Member]	'
Summary of Financial Receivable Nonaccrual Basis	'
	The following table presents an analysis of covered loans accounted for on a nonaccrual basis:
	(Dollars in Thousands)	September 30,				December 31,			September 30,
		2013				2012			2012
	Commercial, financial and agricultural	$	7,872			$	10,765		$	11,938
	Real estate – construction and development		16,582				20,027			21,971
	Real estate – commercial and farmland		37,079				55,946			58,377
	Real estate – residential		13,028				28,672			31,189
	Consumer installment		350				302			426
		$	74,911			$	115,712		$	123,901
Summary of Past Due Financial Receivables	'
	The following table presents an aging analysis of covered loans as of September 30, 2013, December 31, 2012 and September 30, 2012.
		Loans				Loans			Loans 90			Total			Current			Total			Loans 90
		30-59				60-89			or More			Loans			Loans			Loans			Days or
		Days Past				Days			Days Past			Past Due									More Past
		Due				Past Due			Due												Due and
																					Still
																					Accruing
		(Dollars in Thousands)
	As of September 30, 2013:
	Commercial, financial & agricultural	$	319			$	50		$	6,695		$	7,064		$	20,704		$	27,768		$	—
	Real estate – construction & development		2,831				658			15,781			19,270			31,432			50,702			266
	Real estate – commercial & farmland		7,365				5,350			30,503			43,218			193,868			237,086			568
	Real estate – residential		2,980				1,727			11,078			15,785			85,361			101,146			823
	Consumer installment loans		49				—			311			360			587			947			—
	Total	$	13,544			$	7,785		$	64,368		$	85,697		$	331,952		$	417,649		$	1,657
		Loans				Loans			Loans 90			Total			Current			Total			Loans 90
		30-59				60-89			or More			Loans			Loans			Loans			Days or
		Days Past				Days			Days Past			Past Due									More Past
		Due				Past Due			Due												Due and
																					Still
																					Accruing
		(Dollars in Thousands)
	As of December 30, 2012:
	Commercial, financial & agricultural	$	2,390			$	1,105		$	10,612		$	14,107		$	18,499		$	32,606		$	98
	Real estate – construction & development		1,584				2,592			19,656			23,832			46,352			70,184			1,077
	Real estate – commercial & farmland		11,451				7,373			52,570			71,394			207,112			278,506			1,347
	Real estate – residential		6,066				3,396			24,976			34,438			90,618			125,056			779
	Consumer installment loans		45				13			258			316			1,044			1,360			—
	Total	$	21,536			$	14,479		$	108,072		$	144,087		$	363,625		$	507,712		$	3,301
		Loans				Loans			Loans 90			Total			Current			Total			Loans 90
		30-59				60-89			or More			Loans			Loans			Loans			Days or
		Days Past				Days			Days Past			Past Due									More Past
		Due				Past Due			Due												Due and
																					Still
																					Accruing
		(Dollars in Thousands)
	As of September 30, 2012:
	Commercial, financial & agricultural	$	1,384			$	788		$	11,315		$	13,487		$	23,680		$	37,167		$	—
	Real estate – construction & development		3,611				1,663			22,194			27,468			45,888			73,356			2,312
	Real estate – commercial & farmland		7,072				6,559			51,382			65,013			233,890			298,903			808
	Real estate – residential		4,702				3,349			28,559			36,610			98,544			135,154			1,018
	Consumer installment loans		56				92			255			403			1,251			1,654			—
	Total	$	16,825			$	12,451		$	113,705		$	142,981		$	403,253		$	546,234		$	4,138
Summary of Impaired Financial Receivables	'
	The following is a summary of information pertaining to covered impaired loans:
		As of and For the Period Ended
		September 30,				December 31,			September 30,
		2013				2012			2012
		(Dollars in Thousands)
	Nonaccrual loans	$	74,911			$	115,712		$	123,901
	Troubled debt restructurings not included above		21,184				19,194			25,926
	Total impaired loans	$	96,095			$	134,906		$	149,827
	Impaired loans not requiring a related allowance	$	96,095			$	134,906		$	149,827
	Impaired loans requiring a related allowance	$	—			$	—		$	—
	Allowance related to impaired loans	$	—			$	—		$	—
	Average investment in impaired loans	$	115,689			$	163,825		$	171,055
	Interest income recognized on impaired loans	$	793			$	849		$	1,319
	Foregone interest income on impaired loans	$	286			$	491		$	554
	The following table presents an analysis of information pertaining to impaired covered loans as of September 30, 2013, December 31, 2012 and September 30, 2012.
		Unpaid				Recorded			Recorded			Total			Related			Average
		Contractual				Investment			Investment			Recorded			Allowance			Recorded
		Principal				With No			With			Investment						Investment
		Balance				Allowance			Allowance
		(Dollars in Thousands)
	As of September 30, 2013:
	Commercial, financial & agricultural	$	10,645			$	7,884		$	—		$	7,884		$	—		$	9,052
	Real estate – construction & development		25,401				20,890			—			20,890			—			22,734
	Real estate – commercial & farmland		51,105				43,279			—			43,279			—			54,292
	Real estate – residential		28,078				23,692			—			23,692			—			29,316
	Consumer installment loans		404				350			—			350			—			295
	Total	$	115,633			$	96,095		$	—		$	96,095		$	—		$	115,689
		Unpaid				Recorded			Recorded			Total			Related			Average
		Contractual				Investment			Investment			Recorded			Allowance			Recorded
		Principal				With No			With			Investment						Investment
		Balance				Allowance			Allowance
		(Dollars in Thousands)
	As of December 31, 2012:
	Commercial, financial & agricultural	$	27,060			$	10,802		$	—		$	10,802		$	—		$	12,506
	Real estate – construction & development		85,279				23,236			—			23,236			—			29,970
	Real estate – commercial & farmland		159,493				64,231			—			64,231			—			78,790
	Real estate – residential		63,559				36,335			—			36,335			—			42,061
	Consumer installment loans		393				302			—			302			—			498
	Total	$	335,784			$	134,906		$	—		$	134,906		$	—		$	163,825
		Unpaid				Recorded			Recorded			Total			Related			Average
		Contractual				Investment			Investment			Recorded			Allowance			Recorded
		Principal				With No			With			Investment						Investment
		Balance				Allowance			Allowance
		(Dollars in Thousands)
	As of September 30, 2012:
	Commercial, financial & agricultural	$	17,833			$	11,976		$	—		$	11,976		$	—		$	12,932
	Real estate – construction & development		34,787				23,833			—			23,833			—			31,653
	Real estate – commercial & farmland		98,909				72,802			—			72,802			—			82,430
	Real estate – residential		54,020				40,790			—			40,790			—			43,492
	Consumer installment loans		890				426			—			426			—			548
	Total	$	206,439			$	149,827		$	—		$	149,827		$	—		$	171,055
Summary of Credit Quality Indicate Financial Receivable	'
	The following table presents the covered loan portfolio by risk grade as of September 30, 2013.
	Risk	Commercial,				Real estate -			Real estate -			Real estate -			Consumer			Other			Total
	Grade	financial &				construction &			commercial &			residential			installment loans
		agricultural				development			farmland
		(Dollars in Thousands)
	10	$	—			$	—		$	—		$	—		$	—		$	—		$	—
	15		—				22			1,098			641			—			—			1,761
	20		2,697				11,347			34,252			22,545			208			—			71,049
	23		135				1,080			16,708			2,902			51			—			20,876
	25		7,609				7,360			108,886			39,632			250			—			163,737
	30		1,485				5,505			24,790			9,196			14			—			40,990
	40		15,842				25,388			51,352			26,230			424			—			119,236
	50		—				—			—			—			—			—			—
	60		—				—			—			—			—			—			—
	Total	$	27,768			$	50,702		$	237,086		$	101,146		$	947		$	—		$	417,649
	The following table presents the covered loan portfolio by risk grade as of December 31, 2012.
	Risk	Commercial,				Real estate -			Real estate -			Real estate -			Consumer			Other			Total
	Grade	financial &				construction &			commercial &			residential			installment loans
		agricultural				development			farmland
		(Dollars in Thousands)
	10	$	—			$	—		$	—		$	—		$	—		$	—		$	—
	15		—				39			1,640			644			—			—			2,323
	20		3,997				12,194			37,098			31,337			292			—			84,918
	23		28				1,174			9,576			2,052			—			—			12,830
	25		10,013				19,216			114,849			40,194			558			—			184,830
	30		4,294				7,214			38,665			11,883			50			—			62,106
	40		14,274				30,347			76,678			38,946			460			—			160,705
	50		—				—			—			—			—			—			—
	60		—				—			—			—			—			—			—
	Total	$	32,606			$	70,184		$	278,506		$	125,056		$	1,360		$	—		$	507,712
	The following table presents the covered loan portfolio by risk grade as of September 30, 2012.
	Risk	Commercial,				Real estate -			Real estate -			Real estate -			Consumer			Other			Total
	Grade	financial &				construction &			commercial &			residential			installment loans
		agricultural				development			farmland
		(Dollars in Thousands)
	10	$	—			$	8		$	—		$	853		$	—		$	—		$	861
	15		91				44			1,673			708			—			—			2,516
	20		4,970				13,950			40,912			34,397			319			—			94,548
	23		30				1,226			4,638			1,889			—			—			7,783
	25		11,986				18,921			130,155			44,999			721			—			206,782
	30		4,063				7,494			35,764			9,016			64			—			56,401
	40		16,027				31,713			85,761			43,292			550			—			177,343
	50		—				—			—			—			—			—			—
	60		—				—			—			—			—			—			—
	Total	$	37,167			$	73,356		$	298,903		$	135,154		$	1,654		$	—		$	546,234

Assets_Acquired_in_FDICAssiste1

Assets Acquired in FDIC-Assisted Acquisitions (Tables)	9 Months Ended
	Sep. 30, 2013
Schedule of Acquisition Details	'
	From October 2009 through July 2012, the Company participated in ten FDIC-assisted acquisitions whereby the Company purchased certain failed institutions out of the FDIC’s receivership. These institutions include the following:
	Bank Acquired	Location:		Branches:	Date Acquired
	American United Bank (“AUB”)	Lawrenceville, Ga.		1	October 23, 2009
	United Security Bank (“USB”)	Sparta, Ga.		2	November 6, 2009
	Satilla Community Bank (“SCB”)	St. Marys, Ga.		1	May 14, 2010
	First Bank of Jacksonville (“FBJ”)	Jacksonville, Fl.		2	October 22, 2010
	Tifton Banking Company (“TBC”)	Tifton, Ga.		1	November 12, 2010
	Darby Bank & Trust (“DBT”)	Vidalia, Ga.		7	November 12, 2010
	High Trust Bank (“HTB”)	Stockbridge, Ga.		2	July 15, 2011
	One Georgia Bank (“OGB”)	Midtown Atlanta, Ga.		1	July 15, 2011
	Central Bank of Georgia (“CBG”)	Ellaville, Ga.		5	February 24, 2012
	Montgomery Bank & Trust (“MBT”)	Ailey, Ga.		2	July 6, 2012
Components of Covered Assets	'
	The following table summarizes components of all covered assets at September 30, 2013, December 31, 2012 and September 30, 2012 and their origin:
		Covered			Less:			Less:			Total		OREO		Less:		Total		Total		FDIC
		loans			Credit risk			Liquidity			covered				Fair value		covered		covered		indemnification
					adjustments			and rate			loans				adjustments		OREO		assets		asset
								adjustments
	As of September 30, 2013:	(Dollars in Thousands)
	AUB	$	19,336		$	915		$	—		$	18,421	$	3,338	$	3	$	3,335	$	21,756	$	3,704
	USB		21,168			1,665			—			19,503		3,066		139		2,927		22,430		2,796
	SCB		35,555			1,902			—			33,653		5,348		429		4,919		38,572		4,020
	FBJ		27,222			3,965			—			23,257		1,582		170		1,412		24,669		4,990
	DBT		116,685			21,739			—			94,946		19,720		1,639		18,081		113,027		23,955
	TBC		35,588			2,519			54			33,015		5,912		843		5,069		38,084		4,315
	HTB		70,156			8,232			41			61,883		6,998		2,445		4,553		66,436		11,065
	OGB		63,794			6,658			108			57,028		9,921		3,918		6,003		63,031		9,458
	CBG		92,755			16,712			100			75,943		8,299		2,046		6,253		82,196		17,460
	Total	$	482,259		$	64,307		$	303		$	417,649	$	64,184	$	11,632	$	52,552	$	470,201	$	81,763
		Covered			Less:			Less:			Total		OREO		Less:		Total		Total		FDIC
		loans			Credit risk			Liquidity			covered				Fair value		covered		covered		indemnification
					adjustments			and rate			loans				adjustments		OREO		assets		asset
								adjustments
	As of December 31, 2012:	(Dollars in Thousands)
	AUB	$	27,169		$	2,481		$	—		$	24,688	$	10,636	$	102	$	10,534	$	35,222	$	2,905
	USB		27,286			4,320			—			22,966		7,087		99		6,988		29,954		6,619
	SCB		41,389			3,285			—			38,104		10,686		654		10,032		48,136		6,133
	FBJ		32,574			6,204			27			26,343		3,260		526		2,734		29,077		6,589
	DBT		169,527			41,631			207			127,689		30,395		2,160		28,235		155,924		47,012
	TBC		46,796			4,979			173			41,644		11,089		1,381		9,708		51,352		8,073
	HTB		90,602			16,072			52			74,478		13,980		4,954		9,026		83,504		20,020
	OGB		81,908			17,127			136			64,645		9,168		4,078		5,090		69,735		16,871
	CBG		124,200			36,884			161			87,155		9,046		3,120		5,926		93,081		45,502
	Total	$	641,451		$	132,983		$	756		$	507,712	$	105,347	$	17,074	$	88,273	$	595,985	$	159,724
		Covered			Less:			Less:			Total		OREO		Less:		Total		Total		FDIC
		loans			Credit risk			Liquidity			covered				Fair value		covered		covered		indemnification
					adjustments			and rate			loans				adjustments		OREO		assets		asset
								adjustments
	As of September 30, 2012:	(Dollars in Thousands)
	AUB	$	28,955		$	2,532		$	—		$	26,423	$	10,342	$	—	$	10,342	$	36,765	$	3,256
	USB		33,145			5,036			—			28,109		7,641		99		7,542		35,651		8,408
	SCB		44,340			3,892			—			40,448		10,464		646		9,818		50,266		6,130
	FBJ		33,312			6,299			43			26,970		3,407		572		2,835		29,805		6,731
	DBT		186,815			47,598			331			138,886		33,404		2,798		30,606		169,492		63,789
	TBC		51,084			5,790			212			45,082		10,110		1,533		8,577		53,659		15,559
	HTB		95,904			18,727			56			77,121		15,219		5,766		9,453		86,574		23,698
	OGB		86,091			18,719			146			67,226		7,874		3,663		4,211		71,437		21,419
	CBG		139,583			43,406			208			95,969		8,518		3,007		5,511		101,480		49,450
	Total	$	699,229		$	151,999		$	996		$	546,234	$	106,979	$	18,084	$	88,895	$	635,129	$	198,440
Loan-by-Loan Basis Performance of Fair Value Adjustments	'
	The adjustments to fair value are performed on a loan-by-loan basis and have resulted in the following:
	Total Amounts	September 30,			December 31,			September 30,
		2013			2012			2012
		(Dollars in Thousands)
	Adjustments needed where the Company’s initial estimate of cash flows were underestimated: (recorded with a reclassification from non-accretable difference to accretable discount)	$	50,703		$	23,050		$	16,210
	Adjustments needed where the Company’s initial estimate of cash flows were overstated: (recorded through a provision for loan losses)		6,305			13,190			11,435
	Amounts reflected in the Company’s Statement of Operations	September 30,			December 31,			September 30,
		2013			2012			2012
		(Dollars in Thousands)
	Adjustments needed where the Company’s initial estimate of cash flows were underestimated: (recorded with a reclassification from non-accretable difference to accretable discount)	$	10,141		$	4,610		$	3,242
	Adjustments needed where the Company’s initial estimate of cash flows were overstated: (recorded through a provision for loan losses)		1,261			2,638			2,287
Schedule of Changes in Accretable Discount Related Acquired Loan	'
	The following is a summary of changes in the accretable discounts of acquired loans during the nine months ended September 30, 2013, the year ended December 31, 2012 and the nine months ended September 30, 2012.
	(Dollars in Thousands)	September 30,			December 31,			September 30,
		2013			2012			2012
	Balance, January 1	$	16,698		$	29,537		$	29,537
	Additions due to acquisitions		—			9,863			9,863
	Accretion		(36,552	)		(45,752	)		(36,241	)
	Other activity, net		50,703			23,050			16,210
	Ending balance	$	30,849		$	16,698		$	19,369
Changes in FDIC Shared Loss Receivable	'
	Changes in the FDIC shared-loss receivable for the nine months ended September 30, 2013, for the year ended December 31, 2012 and for the nine months ended September 30, 2012 are as follows:
	(Dollars in Thousands)	September 30,			December 31,			September 30,
		2013			2012			2012
	Balance, January 1	$	159,724		$	242,394		$	242,394
	Indemnification asset recorded in acquisitions		—			52,654			52,654
	Payments received from FDIC		(58,240	)		(128,730	)		(97,399	)
	Effect of change in expected cash flows on covered assets		(19,721	)		(6,594	)		791
	Ending balance	$	81,763		$	159,724		$	198,440
Loans with Deterioration of Credit Quality [Member]	'
Rollforward of Acquired Loans Deterioration of Credit Quality	'
	A rollforward of acquired loans with deterioration of credit quality for the nine months ended September 30, 2013, the year ended December 31, 2012 and the nine months ended September 30, 2012 is shown below:
	(Dollars in Thousands)	September 30,			December 31,			September 30,
		2013			2012			2012
	Balance, January 1	$	282,737		$	307,790		$	307,790
	Change in estimate of cash flows, net of charge-offs or recoveries		30,371			(17,712	)		(7,119	)
	Additions due to acquisitions		—			73,414			73,414
	Other (loan payments, transfers, etc.)		(81,519	)		(80,755	)		(70,402	)
	Ending balance	$	231,589		$	282,737		$	303,683
Loans without Deterioration of Credit Quality [Member]	'
Rollforward of Acquired Loans Deterioration of Credit Quality	'
	A rollforward of acquired loans without deterioration of credit quality for the nine months ended September 30, 2013, the year ended December 31, 2012 and the nine months ended September 30, 2012 is shown below:
	(Dollars in Thousands)	September 30,			December 31,			September 30,
		2013			2012			2012
	Balance, January 1	$	228,602		$	266,966		$	266,966
	Change in estimate of cash flows, net of charge-offs or recoveries		11,554			1,376			3,861
	Additions due to acquisitions		—			51,368			51,367
	Other (loan payments, transfers, etc.)		(53,870	)		(91,108	)		(72,755	)
	Ending balance	$	186,286		$	228,602		$	249,439

Weighted_Average_Shares_Outsta1

Weighted Average Shares Outstanding (Tables)	9 Months Ended
	Sep. 30, 2013
Earnings Per Share [Abstract]	'
Summary of Weighted Average Number of Shares	'
	Earnings per share have been computed based on the following weighted average number of common shares outstanding:
		For the Three Months				For the Nine Months
		Ended September 30,				Ended September 30,
		2013		2012		2013		2012
		(Share Data in				(Share Data in
		Thousands)				Thousands)
	Basic shares outstanding		23,901		23,819		23,883		23,800
	Plus: Dilutive effect of ISOs		62		105		62		105
	Plus: Dilutive effect of Restricted grants		353		49		353		49
	Diluted shares outstanding		24,316		23,973		24,298		23,954

Commitments_Tables

Commitments (Tables)	9 Months Ended
	Sep. 30, 2013
Commitments And Contingencies Disclosure [Abstract]	'
Summary of Commitments to Extend Credit and Standby Letters of Credit	'
	The Company’s commitments to extend credit and standby letters of credit are presented in the following table:
	(Dollars in Thousands)	September 30,		December 31,		September 30,
		2013		2012		2012
	Commitments to extend credit	$	208,303	$	180,733	$	145,936
	Standby letters of credit	$	6,954	$	6,788	$	9,367

Accumulated_Other_Comprehensiv1

Accumulated Other Comprehensive Income (Tables)	9 Months Ended
	Sep. 30, 2013
Text Block [Abstract]	'
Summary of Accumulated Other Comprehensive Income	'
	The following tables present a summary of the accumulated other comprehensive income balances, net of tax, as of September 30, 2013 and 2012.
	(Dollars in Thousands)	Unrealized			Unrealized			Accumulated
		Gain			Gain			Other
		(Loss) on			(Loss) on			Comprehensive
		Derivatives			Securities			Income (Loss)
	Balance, January 1, 2013	$	(23	)	$	6,630		$	6,607
	Reclassification for gains included in net income		—			(111	)		(111	)
	Current year changes		1,098			(8,125	)		(7,027	)
	Balance, September 30, 2013	$	1,075		$	(1,606	)	$	(531	)
	(Dollars in Thousands)	Unrealized			Unrealized			Accumulated
		Gain			Gain			Other
		(Loss) on			(Loss) on			Comprehensive
		Derivatives			Securities			Income (Loss)
	Balance, January 1, 2012	$	856		$	6,440		$	7,296
	Reclassification for gains included in net income		—			—			—
	Current year changes		(976	)		1,017			41
	Balance, September 30, 2012	$	(120	)	$	7,457		$	7,337

Segment_Reporting_Tables

Segment Reporting (Tables)	9 Months Ended
	Sep. 30, 2013
Segment Reporting [Abstract]	'
Schedule of Financial Information with Respect to Company's Reportable Business Segments	'
	The following tables present selected financial information with respect to the Company’s reportable business segments for the three- and nine-month periods ended September 30 2013 and 2012.
		Three Months Ended						Three Months Ended
		30-Sep-13						30-Sep-12
		Retail		Mortgage		Total		Retail		Mortgage			Total
		Banking		Banking				Banking		Banking
		(Dollars in Thousands)
	Net interest income	$	28,089	$	1,231	$	29,320	$	27,953	$	285		$	28,238
	Provision for loan losses		2,920		—		2,920		6,540		—			6,540
	Noninterest income		7,054		5,234		12,288		6,091		3,740			9,831
	Noninterest expense
	Salaries and employee benefits		10,799		3,613		14,412		11,446		2,320			13,766
	Equipment and occupancy expenses		3,029		120		3,149		3,190		150			3,340
	Data processing and telecommunications expenses		2,908		164		30,72		2,510		89			2,599
	Other expenses		7,473		643		8,116		8,706		399			9,105
	Total noninterest expense		24,209		4,540		28,749		25,852		2,958			28,810
	Income before income tax expense		8,014		1,925		9,939		1,652		1,067			2,719
	Income tax expense		2,588		674		3,262		443		373			816
	Net income		5,426		1,251		6,677		1,209		694			1,903
	Less preferred stock dividends		443		—		443		827		—			827
	Net income available to common shareholders	$	4,983	$	1,251	$	6,234	$	382	$	694		$	1,076
	Total assets	$	2,707,200	$	111,302	$	2,818,502	$	2,947,004	$	2,379		$	2,949,383
	Stockholders’ equity		250,863		39,493		290,356		299,221		(15	)		299,206
		Nine Months Ended						Nine Months Ended
		30-Sep-13						30-Sep-12
		Retail		Mortgage		Total		Retail		Mortgage			Total
		Banking		Banking				Banking		Banking
		(Dollars in Thousands)
	Net interest income	$	84,372	$	2,762	$	87,134	$	84,243	$	603		$	84,846
	Provision for loan losses		10,008		—		10,008		26,647		—			26,647
	Noninterest income		20,333		14,699		35,032		37,749		8,221			45,970
	Noninterest expense
	Salaries and employee benefits		32,314		9,285		41,599		32,435		4,902			37,337
	Equipment and occupancy expenses		8,575		483		9,058		9,250		305			9,555
	Data processing and telecommunications expenses		8,013		465		8,478		7,222		207			7,429
	Other expenses		22,807		2,379		25,186		34,470		888			35,358
	Total noninterest expense		71,709		12,612		84,321		83,377		6,302			89,679
	Income before income tax expense		22,988		4,849		27,837		11,968		2,522			14,490
	Income tax expense		7,500		1,697		9,197		3,845		882			4,727
	Net income		15,488		3,152		18,640		8,123		1,640			9,763
	Less preferred stock dividends		1,326		—		1,326		2,459		—			2,459
	Net income available to common shareholders	$	14,162	$	3,152	$	17,314	$	5,664	$	1,640		$	7,304

Basis_of_Presentation_and_Acco3

Basis of Presentation and Accounting Policies - Additional Information (Detail)	9 Months Ended
	Sep. 30, 2013
Basis Of Presentation [Line Items]	'
Number of branches operated	57
Minimum [Member]	'
Basis Of Presentation [Line Items]	'
Intangible assets amortized over an estimated useful life	'3 years
Maximum [Member]	'
Basis Of Presentation [Line Items]	'
Intangible assets amortized over an estimated useful life	'10 years

Basis_of_Presentation_and_Acco4

Basis of Presentation and Accounting Policies - Carrying Amount and Estimated Fair Value of Financial Instruments (Detail) (USD $)	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2012
In Thousands, unless otherwise specified
Financial assets:	'	'	'
Loans, net	$2,022,693	$1,966,592	$1,989,786
Financial liabilities:	'	'	'
Deposits	2,444,244	2,624,883	2,581,465
Carrying Amount [Member]	'	'	'
Financial assets:	'	'	'
Loans, net	1,983,062	1,934,754	1,960,195
Financial liabilities:	'	'	'
Deposits	2,443,421	2,624,663	2,580,117
Level 1 [Member]	'	'	'
Financial assets:	'	'	'
Loans, net	'	'	'
Financial liabilities:	'	'	'
Deposits	'	'	'
Level 2 [Member]	'	'	'
Financial assets:	'	'	'
Loans, net	1,561,480	1,406,366	1,393,115
Financial liabilities:	'	'	'
Deposits	2,444,244	2,624,883	2,581,465
Level 3 [Member]	'	'	'
Financial assets:	'	'	'
Loans, net	$461,213	$560,226	$596,671

Basis_of_Presentation_and_Acco5

Basis of Presentation and Accounting Policies - Fair Value Measurements of Assets and Liabilities Measured on Recurring Basis (Detail) (USD $)	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2012
In Thousands, unless otherwise specified
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'	'
Recurring assets at fair value	$381,882	$395,695	$390,072
Recurring liabilities at fair value	972	2,978	3,233
U.S. Government Agencies [Member]	'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'	'
Recurring assets at fair value	13,917	6,870	8,895
State, County and Municipal Securities [Member]	'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'	'
Recurring assets at fair value	112,939	114,390	111,742
Corporate Debt Securities [Member]	'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'	'
Recurring assets at fair value	9,738	10,328	11,495
Mortgage-Backed Securities [Member]	'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'	'
Recurring assets at fair value	175,654	215,321	228,919
Mortgage Loans Held for Sale [Member]	'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'	'
Recurring assets at fair value	69,634	48,786	29,021
Derivative Financial Instruments [Member]	'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'	'
Recurring liabilities at fair value	972	2,978	3,233
Level 1 [Member]	'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'	'
Recurring assets at fair value	13,835	28,747	8,897
Level 1 [Member] | State, County and Municipal Securities [Member]	'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'	'
Recurring assets at fair value	4,460	4,854	6,932
Level 1 [Member] | Mortgage-Backed Securities [Member]	'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'	'
Recurring assets at fair value	9,375	23,893	1,965
Level 2 [Member]	'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'	'
Recurring assets at fair value	366,047	364,948	379,175
Recurring liabilities at fair value	972	2,978	3,233
Level 2 [Member] | U.S. Government Agencies [Member]	'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'	'
Recurring assets at fair value	13,917	6,870	8,895
Level 2 [Member] | State, County and Municipal Securities [Member]	'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'	'
Recurring assets at fair value	108,479	109,536	104,810
Level 2 [Member] | Corporate Debt Securities [Member]	'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'	'
Recurring assets at fair value	7,738	8,328	9,495
Level 2 [Member] | Mortgage-Backed Securities [Member]	'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'	'
Recurring assets at fair value	166,279	191,428	226,954
Level 2 [Member] | Mortgage Loans Held for Sale [Member]	'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'	'
Recurring assets at fair value	69,634	48,786	29,021
Level 2 [Member] | Derivative Financial Instruments [Member]	'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'	'
Recurring liabilities at fair value	972	2,978	3,233
Level 3 [Member]	'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'	'
Recurring assets at fair value	2,000	2,000	2,000
Level 3 [Member] | Corporate Debt Securities [Member]	'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'	'
Recurring assets at fair value	$2,000	$2,000	$2,000

Basis_of_Presentation_and_Acco6

Basis of Presentation and Accounting Policies - Valuation Methodologies for Instruments Measured at Fair Value on Nonrecurring Basis (Detail) (USD $)	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2012
In Thousands, unless otherwise specified
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]	'	'	'
Nonrecurring assets at fair value	$551,743	$688,349	$722,891
Impaired Loans Carried at Fair Value [Member]	'	'	'
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]	'	'	'
Nonrecurring assets at fair value	43,564	52,514	50,437
Other Real Estate Owned [Member]	'	'	'
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]	'	'	'
Nonrecurring assets at fair value	37,978	39,850	37,325
Covered Loans [Member]	'	'	'
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]	'	'	'
Nonrecurring assets at fair value	417,649	507,712	546,234
Covered Other Real Estate Owned [Member]	'	'	'
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]	'	'	'
Nonrecurring assets at fair value	52,552	88,273	88,895
Level 1 [Member]	'	'	'
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]	'	'	'
Nonrecurring assets at fair value	'	'	'
Level 1 [Member] | Impaired Loans Carried at Fair Value [Member]	'	'	'
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]	'	'	'
Nonrecurring assets at fair value	'	'	'
Level 1 [Member] | Other Real Estate Owned [Member]	'	'	'
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]	'	'	'
Nonrecurring assets at fair value	'	'	'
Level 1 [Member] | Covered Loans [Member]	'	'	'
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]	'	'	'
Nonrecurring assets at fair value	'	'	'
Level 1 [Member] | Covered Other Real Estate Owned [Member]	'	'	'
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]	'	'	'
Nonrecurring assets at fair value	'	'	'
Level 2 [Member]	'	'	'
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]	'	'	'
Nonrecurring assets at fair value	'	'	'
Level 2 [Member] | Impaired Loans Carried at Fair Value [Member]	'	'	'
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]	'	'	'
Nonrecurring assets at fair value	'	'	'
Level 2 [Member] | Other Real Estate Owned [Member]	'	'	'
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]	'	'	'
Nonrecurring assets at fair value	'	'	'
Level 2 [Member] | Covered Loans [Member]	'	'	'
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]	'	'	'
Nonrecurring assets at fair value	'	'	'
Level 2 [Member] | Covered Other Real Estate Owned [Member]	'	'	'
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]	'	'	'
Nonrecurring assets at fair value	'	'	'
Level 3 [Member]	'	'	'
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]	'	'	'
Nonrecurring assets at fair value	551,743	688,349	722,891
Level 3 [Member] | Impaired Loans Carried at Fair Value [Member]	'	'	'
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]	'	'	'
Nonrecurring assets at fair value	43,564	52,514	50,437
Level 3 [Member] | Other Real Estate Owned [Member]	'	'	'
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]	'	'	'
Nonrecurring assets at fair value	37,978	39,850	37,325
Level 3 [Member] | Covered Loans [Member]	'	'	'
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]	'	'	'
Nonrecurring assets at fair value	417,649	507,712	546,234
Level 3 [Member] | Covered Other Real Estate Owned [Member]	'	'	'
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]	'	'	'
Nonrecurring assets at fair value	$52,552	$88,273	$88,895

Basic_of_Presention_and_Accoun

Basic of Presention and Accounting Policies - Summary of Significant Unobservable Inputs Used in Fair Value Measurement of Level 3 Assets and Liabilities (Detail) (USD $)

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2012

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

In Thousands, unless otherwise specified

Other Real Estate Owned [Member]

Other Real Estate Owned [Member]

Other Real Estate Owned [Member]

Covered Other Real Estate Owned [Member]

Covered Other Real Estate Owned [Member]

Covered Other Real Estate Owned [Member]

Level 3 [Member]

Level 3 [Member]

Level 3 [Member]

Level 3 [Member]

Level 3 [Member]

Level 3 [Member]

Level 3 [Member]

Level 3 [Member]

Level 3 [Member]

Level 3 [Member]

Level 3 [Member]

Level 3 [Member]

Level 3 [Member]

Level 3 [Member]

Minimum [Member]

Minimum [Member]

Minimum [Member]

Minimum [Member]

Minimum [Member]

Maximum [Member]

Maximum [Member]

Maximum [Member]

Maximum [Member]

Maximum [Member]

Other Real Estate Owned [Member]

Other Real Estate Owned [Member]

Other Real Estate Owned [Member]

Covered Other Real Estate Owned [Member]

Covered Other Real Estate Owned [Member]

Covered Other Real Estate Owned [Member]

Fair Value Measurements on a Nonrecurring Basis [Member]

Fair Value Measurements on a Nonrecurring Basis [Member]

Fair Value Measurements on a Nonrecurring Basis [Member]

Fair Value Measurements on a Nonrecurring Basis [Member]

Fair Value, Measurements, Recurring [Member]

Level 3 [Member]

Level 3 [Member]

Level 3 [Member]

Level 3 [Member]

Level 3 [Member]

Level 3 [Member]

Level 3 [Member]

Level 3 [Member]

Level 3 [Member]

Level 3 [Member]

Impaired Loans [Member]

Other Real Estate Owned [Member]

Covered Loans [Member]

Covered Other Real Estate Owned [Member]

Fair Value Measurements on a Nonrecurring Basis [Member]

Fair Value Measurements on a Nonrecurring Basis [Member]

Fair Value Measurements on a Nonrecurring Basis [Member]

Fair Value Measurements on a Nonrecurring Basis [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value Measurements on a Nonrecurring Basis [Member]

Fair Value Measurements on a Nonrecurring Basis [Member]

Fair Value Measurements on a Nonrecurring Basis [Member]

Fair Value Measurements on a Nonrecurring Basis [Member]

Fair Value, Measurements, Recurring [Member]

Impaired Loans [Member]

Other Real Estate Owned [Member]

Covered Loans [Member]

Covered Other Real Estate Owned [Member]

Impaired Loans [Member]

Other Real Estate Owned [Member]

Covered Loans [Member]

Covered Other Real Estate Owned [Member]

Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Fair Value Disclosure, Nonrecurring

$551,743

$688,349

$722,891

$37,978

$39,850

$37,325

$52,552

$88,273

$88,895

$551,743

$688,349

$722,891

$37,978

$39,850

$37,325

$52,552

$88,273

$88,895

$43,564

$37,978

$417,649

$52,552

'

'

'

'

'

'

'

'

'

'

'

Investment securities available for sale, Recurring

$381,882

$395,695

$390,072

'

'

'

'

'

'

$2,000

$2,000

$2,000

'

'

'

'

'

'

'

'

'

'

$2,000

'

'

'

'

'

'

'

'

'

'

Valuation Technique

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'Third party appraisals and discounted cash flows

'Third party appraisals

'Third party appraisals and discounted cash flows

'Third party appraisals

'Discounted par values

'

'

'

'

'

'

'

'

'

'

Fair value inputs discount rate range

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

4.00%

10.00%

1.75%

10.00%

0.00%

75.00%

78.00%

75.00%

84.00%

0.00%

Basis_of_Presentation_and_Acco7

Basis of Presentation and Accounting Policies - Schedule of Company's Reconciliation of Level 3 Assets (Detail) (USD $)

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2012

Dec. 31, 2011

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2013

Sep. 30, 2012

In Thousands, unless otherwise specified

Investment Securities Available for Sale [Member]

Investment Securities Available for Sale [Member]

Investment Securities Available for Sale [Member]

Investment Securities Available for Sale [Member]

Impaired Loans Carried at Fair Value [Member]

Impaired Loans Carried at Fair Value [Member]

Other Real Estate Owned [Member]

Other Real Estate Owned [Member]

Covered Loans [Member]

Covered Loans [Member]

Covered Other Real Estate Owned [Member]

Covered Other Real Estate Owned [Member]

Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

Beginning balance

$2,000

$2,000

$2,000

$2,000

$52,514

$70,296

$39,850

$46,680

$507,712

$571,489

$88,273

$78,617

Total gains/(losses) included in net income

'

'

'

'

'

'

-2,214

-9,048

'

'

-3,432

'

Purchases, sales, issuances, and settlements, net

'

'

'

'

-621

'

-7,987

-21,008

-61,338

15,281

-61,014

-30,258

Transfers in to Level 3

'

'

'

'

'

842

'

'

'

'

'

'

Asset reclassification, within Level 3

'

'

'

'

-8,329

-20,701

8,329

20,701

-28,725

-40,536

28,725

40,536

Ending balance

$2,000

$2,000

$2,000

$2,000

$43,564

$50,437

$37,978

$37,325

$417,649

$546,234

$52,552

$88,895

Pending_Merger_and_Acquisition1

Pending Merger and Acquisition - Additional Information (Detail) (USD $)	1 Months Ended
In Millions, except Share data, unless otherwise specified	1-May-13	Jun. 30, 2013
Prosperity Banking Company [Member]	'	'
Business Acquisition [Line Items]	'	'
Reported assets of Prosperity	'	$754
Reported loans of Prosperity	'	485
Reported deposits of Prosperity	'	493
Shares to receive for each share of Prosperity common stock pursuant to the merger agreement	3.125	'
Cash to receive for each share of Prosperity common stock pursuant to the merger agreement	$41.50	'
Maximum consideration in form of cash	50.00%	'
Stock consideration	100.00%	'
Transaction amount	$15.70	'
Company's closing stock price	$13.32	'
Prosperity's common shares outstanding	377,960	'
Prosperity Bank [Member]	'	'
Business Acquisition [Line Items]	'	'
Number of banking locations	12	'

Investment_Securities_Amortize

Investment Securities - Amortized Cost and Estimated Fair Value of Investment Securities Available for Sale (Detail) (USD $)	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2012
In Thousands, unless otherwise specified
Schedule of Available-for-Sale Securities [Line Items]	'	'	'
Amortized Cost	$314,720	$336,710	$349,581
Gross Unrealized Gains	5,325	11,166	12,458
Gross Unrealized Losses	-7,797	-967	-988
Fair Value	312,248	346,909	361,051
U.S. Government Agencies [Member]	'	'	'
Schedule of Available-for-Sale Securities [Line Items]	'	'	'
Amortized Cost	14,945	6,605	8,606
Gross Unrealized Gains	'	271	289
Gross Unrealized Losses	-1,028	-6	'
Fair Value	13,917	6,870	8,895
State, County and Municipal Securities [Member]	'	'	'
Schedule of Available-for-Sale Securities [Line Items]	'	'	'
Amortized Cost	112,643	109,736	106,541
Gross Unrealized Gains	2,331	4,864	5,345
Gross Unrealized Losses	-2,035	-210	-144
Fair Value	112,939	114,390	111,742
Corporate Debt Securities [Member]	'	'	'
Schedule of Available-for-Sale Securities [Line Items]	'	'	'
Amortized Cost	10,314	10,545	11,793
Gross Unrealized Gains	280	330	262
Gross Unrealized Losses	-856	-547	-560
Fair Value	9,738	10,328	11,495
Mortgage-Backed Securities [Member]	'	'	'
Schedule of Available-for-Sale Securities [Line Items]	'	'	'
Amortized Cost	176,818	209,824	222,641
Gross Unrealized Gains	2,714	5,701	6,562
Gross Unrealized Losses	-3,878	-204	-284
Fair Value	$175,654	$215,321	$228,919

Investment_Securities_Amortize1

Investment Securities - Amortized Cost and Fair Value of Available-for-Sale Securities by Contractual Maturity (Detail) (USD $)	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2012
In Thousands, unless otherwise specified
Investments Debt And Equity Securities [Abstract]	'	'	'
Due in one year or less, Amortized Cost	$2,214	'	'
Due from one year to five years, Amortized Cost	36,699	'	'
Due from five to ten years, Amortized Cost	68,790	'	'
Due after ten years, Amortized Cost	30,199	'	'
Mortgage-backed securities, Amortized cost	176,818	'	'
Mortgage-backed securities, Amortized Cost	314,720	336,710	349,581
Due in one year or less, Fair Value	2,229	'	'
Due from one year to five years, Fair Value	37,826	'	'
Due from five to ten years, Fair Value	67,622	'	'
Due after ten years, Fair Value	28,917	'	'
Mortgage-backed securities, Fair Value	175,654	'	'
Fair Value	$312,248	$346,909	$361,051

Investment_Securities_Addition

Investment Securities - Additional Information (Detail) (USD $)	Sep. 30, 2013
In Millions, unless otherwise specified
Investments Debt And Equity Securities [Abstract]	'
Securities, carrying value	$217.30

Investment_Securities_Schedule

Investment Securities - Schedule of Gross Unrealized Losses and Fair Value of Securities (Detail) (USD $)	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2012
In Thousands, unless otherwise specified
Schedule of Available-for-Sale Securities [Line Items]	'	'	'
Less Than 12 Months Fair Value	$151,072	$44,540	$47,313
12 Months or More Fair Value	8,042	8,682	9,490
Total Fair Value	159,114	53,222	56,803
Less Than 12 Months Unrealized Losses	-6,641	-386	-399
12 Months or More Unrealized Losses	-1,156	-581	-589
Total Unrealized Losses	-7,797	-967	-988
U.S. Government Agencies [Member]	'	'	'
Schedule of Available-for-Sale Securities [Line Items]	'	'	'
Less Than 12 Months Fair Value	13,917	4,994	'
12 Months or More Fair Value	'	'	'
Total Fair Value	13,917	4,994	'
Less Than 12 Months Unrealized Losses	-1,028	-6	'
12 Months or More Unrealized Losses	'	'	'
Total Unrealized Losses	-1,028	-6	'
State, County and Municipal Securities [Member]	'	'	'
Schedule of Available-for-Sale Securities [Line Items]	'	'	'
Less Than 12 Months Fair Value	46,516	15,595	14,653
12 Months or More Fair Value	3,807	505	505
Total Fair Value	50,323	16,100	15,158
Less Than 12 Months Unrealized Losses	-1,735	-199	-132
12 Months or More Unrealized Losses	-300	-11	-12
Total Unrealized Losses	-2,035	-210	-144
Corporate Debt Securities [Member]	'	'	'
Schedule of Available-for-Sale Securities [Line Items]	'	'	'
12 Months or More Fair Value	4,235	4,560	5,551
Total Fair Value	4,235	4,560	5,551
12 Months or More Unrealized Losses	-856	-547	-560
Total Unrealized Losses	-856	-547	-560
Mortgage-Backed Securities [Member]	'	'	'
Schedule of Available-for-Sale Securities [Line Items]	'	'	'
Less Than 12 Months Fair Value	90,639	23,951	32,660
12 Months or More Fair Value	'	3,617	3,434
Total Fair Value	90,639	27,568	36,094
Less Than 12 Months Unrealized Losses	-3,878	-181	-267
12 Months or More Unrealized Losses	'	-23	-17
Total Unrealized Losses	($3,878)	($204)	($284)

Loans_Schedule_of_Accounts_Not

Loans - Schedule of Accounts Notes Loans and Financial Receivables (Detail) (USD $)	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2012
In Thousands, unless otherwise specified
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Loans and deferred loan fees receivables	$1,589,267	$1,450,635	$1,439,862
Commercial, Financial and Agricultural [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Loans and deferred loan fees receivables	244,991	174,217	189,374
Real Estate - Construction and Development [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Loans and deferred loan fees receivables	132,277	114,199	125,315
Real Estate - Commercial and Farmland [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Loans and deferred loan fees receivables	799,149	732,322	713,240
Real Estate - Residential [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Loans and deferred loan fees receivables	355,920	346,480	343,332
Consumer Installment Loans [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Loans and deferred loan fees receivables	36,303	40,178	43,441
Other [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Loans and deferred loan fees receivables	$20,627	$43,239	$25,160

Loans_Additional_Information_D

Loans - Additional Information (Detail) (USD $)	9 Months Ended		12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
	Category
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Covered loans acquired in FDIC-assisted transactions	$417,600,000	$546,200,000	$507,700,000
Past due loan accrued	'90 days	'	'
Nonaccrual loans	200,000	'	'
Number of risk grading system category	9	'	'
Loan-to-value ratio	110.00%	'	'
Modified loans	17,000,000	23,500,000	'
Troubled debt restructurings	20,200,000	23,300,000	23,900,000
Troubled debt restructurings, previous charge-offs	2,100,000	2,100,000	1,900,000
Allowance for loan losses allocated to troubled debt restructurings	412,000	676,000	640,000
Troubled debt restructurings, provision for loan loss expense	1,300,000	2,300,000	2,600,000
Troubled Debt Restructuring [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Nonaccrual loans	$100,000	'	'

Loans_Summary_of_Covered_Loans

Loans - Summary of Covered Loans According to Loan Type (Detail) (USD $)	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2012
In Thousands, unless otherwise specified
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Covered loans	$417,649	$507,712	$546,234
Commercial, Financial and Agricultural [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Covered loans	27,768	32,606	37,167
Real Estate - Construction and Development [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Covered loans	50,702	70,184	73,356
Real Estate - Commercial and Farmland [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Covered loans	237,086	278,506	298,903
Real Estate - Residential [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Covered loans	101,146	125,056	135,154
Consumer Installment Loans [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Covered loans	$947	$1,360	$1,654

Loans_Summary_of_Financial_Rec

Loans - Summary of Financial Receivable Nonaccrual Basis (Detail) (USD $)	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Covered loans	$200,000	'	'
Non-Covered Loan [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Covered loans	31,720,000	38,885,000	38,225,000
Non-Covered Loan [Member] | Commercial, Financial and Agricultural [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Covered loans	4,198,000	4,138,000	4,285,000
Non-Covered Loan [Member] | Real Estate - Construction and Development [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Covered loans	4,229,000	9,281,000	8,201,000
Non-Covered Loan [Member] | Real Estate - Commercial and Farmland [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Covered loans	9,548,000	11,962,000	11,408,000
Non-Covered Loan [Member] | Real Estate - Residential [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Covered loans	13,303,000	12,595,000	13,236,000
Non-Covered Loan [Member] | Consumer Installment Loans [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Covered loans	442,000	909,000	1,095,000
Covered Loans [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Covered loans	74,911,000	115,712,000	123,901,000
Covered Loans [Member] | Commercial, Financial and Agricultural [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Covered loans	7,872,000	10,765,000	11,938,000
Covered Loans [Member] | Real Estate - Construction and Development [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Covered loans	16,582,000	20,027,000	21,971,000
Covered Loans [Member] | Real Estate - Commercial and Farmland [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Covered loans	37,079,000	55,946,000	58,377,000
Covered Loans [Member] | Real Estate - Residential [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Covered loans	13,028,000	28,672,000	31,189,000
Covered Loans [Member] | Consumer Installment Loans [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Covered loans	$350,000	$302,000	$426,000

Loans_Summary_of_NonCovered_Pa

Loans - Summary of Non-Covered Past Due Financial Receivables (Detail) (USD $)	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2012
In Thousands, unless otherwise specified
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Loans 30-59 Days Past Due	$17,000	'	$23,500
Total Loans	1,589,267	1,450,635	1,439,862
Non-Covered Loan [Member]	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Loans 30-59 Days Past Due	11,718	11,825	13,104
Loans 60-89 Days Past Due	7,335	6,097	4,233
Loans 90 or More Days Past Due	30,004	34,287	36,733
Total Loans Past Due	49,057	52,209	54,070
Current Loans	1,540,210	1,398,426	1,385,792
Total Loans	1,589,267	1,450,635	1,439,862
Loans 90 Days or More Past Due and Still Accruing	'	'	'
Commercial, Financial and Agricultural [Member]	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total Loans	244,991	174,217	189,374
Commercial, Financial and Agricultural [Member] | Non-Covered Loan [Member]	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Loans 30-59 Days Past Due	623	258	1,192
Loans 60-89 Days Past Due	297	312	639
Loans 90 or More Days Past Due	4,107	3,969	3,786
Total Loans Past Due	5,027	4,539	5,617
Current Loans	239,964	169,678	183,757
Total Loans	244,991	174,217	189,374
Loans 90 Days or More Past Due and Still Accruing	'	'	'
Real Estate - Construction and Development [Member]	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total Loans	132,277	114,199	125,315
Real Estate - Construction and Development [Member] | Non-Covered Loan [Member]	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Loans 30-59 Days Past Due	1,200	347	518
Loans 60-89 Days Past Due	794	332	152
Loans 90 or More Days Past Due	4,229	8,969	8,180
Total Loans Past Due	6,223	9,648	8,850
Current Loans	126,054	104,551	116,465
Total Loans	132,277	114,199	125,315
Loans 90 Days or More Past Due and Still Accruing	'	'	'
Real Estate - Commercial and Farmland [Member]	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total Loans	799,149	732,322	713,240
Real Estate - Commercial and Farmland [Member] | Non-Covered Loan [Member]	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Loans 30-59 Days Past Due	3,883	2,867	3,507
Loans 60-89 Days Past Due	2,458	2,296	812
Loans 90 or More Days Past Due	9,523	9,544	11,402
Total Loans Past Due	15,864	14,707	15,721
Current Loans	783,285	717,615	697,519
Total Loans	799,149	732,322	713,240
Loans 90 Days or More Past Due and Still Accruing	'	'	'
Real Estate - Residential [Member]	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total Loans	355,920	346,480	343,332
Real Estate - Residential [Member] | Non-Covered Loan [Member]	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Loans 30-59 Days Past Due	5,515	7,651	7,200
Loans 60-89 Days Past Due	3,531	2,766	2,346
Loans 90 or More Days Past Due	11,818	10,990	12,372
Total Loans Past Due	20,864	21,407	21,918
Current Loans	335,056	325,073	321,414
Total Loans	355,920	346,480	343,332
Loans 90 Days or More Past Due and Still Accruing	'	'	'
Consumer Installment Loans [Member]	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total Loans	36,303	40,178	43,441
Consumer Installment Loans [Member] | Non-Covered Loan [Member]	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Loans 30-59 Days Past Due	497	702	687
Loans 60-89 Days Past Due	255	391	284
Loans 90 or More Days Past Due	327	815	993
Total Loans Past Due	1,079	1,908	1,964
Current Loans	35,224	38,270	41,477
Total Loans	36,303	40,178	43,441
Loans 90 Days or More Past Due and Still Accruing	'	'	'
Other [Member]	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total Loans	20,627	43,239	25,160
Other [Member] | Non-Covered Loan [Member]	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Current Loans	20,627	43,239	25,160
Total Loans	20,627	43,239	25,160
Loans 90 Days or More Past Due and Still Accruing	'	'	'

Loans_Summary_of_Covered_Past_

Loans - Summary of Covered Past Due Financial Receivables (Detail) (USD $)	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2012
In Thousands, unless otherwise specified
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Loans 30-59 Days Past Due	$17,000	'	$23,500
Total Loans	1,589,267	1,450,635	1,439,862
Covered Loans [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Loans 30-59 Days Past Due	13,544	21,536	16,825
Loans 60-89 Days Past Due	7,785	14,479	12,451
Loans 90 or More Days Past Due	64,368	108,072	113,705
Total Loans Past Due	85,697	144,087	142,981
Current Loans	331,952	363,625	403,253
Total Loans	417,649	507,712	546,234
Loans 90 Days or More Past Due and Still Accruing	1,657	3,301	4,138
Commercial, Financial and Agricultural [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Total Loans	244,991	174,217	189,374
Commercial, Financial and Agricultural [Member] | Covered Loans [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Loans 30-59 Days Past Due	319	2,390	1,384
Loans 60-89 Days Past Due	50	1,105	788
Loans 90 or More Days Past Due	6,695	10,612	11,315
Total Loans Past Due	7,064	14,107	13,487
Current Loans	20,704	18,499	23,680
Total Loans	27,768	32,606	37,167
Loans 90 Days or More Past Due and Still Accruing	'	98	'
Real Estate - Construction and Development [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Total Loans	132,277	114,199	125,315
Real Estate - Construction and Development [Member] | Covered Loans [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Loans 30-59 Days Past Due	2,831	1,584	3,611
Loans 60-89 Days Past Due	658	2,592	1,663
Loans 90 or More Days Past Due	15,781	19,656	22,194
Total Loans Past Due	19,270	23,832	27,468
Current Loans	31,432	46,352	45,888
Total Loans	50,702	70,184	73,356
Loans 90 Days or More Past Due and Still Accruing	266	1,077	2,312
Real Estate - Commercial and Farmland [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Total Loans	799,149	732,322	713,240
Real Estate - Commercial and Farmland [Member] | Covered Loans [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Loans 30-59 Days Past Due	7,365	11,451	7,072
Loans 60-89 Days Past Due	5,350	7,373	6,559
Loans 90 or More Days Past Due	30,503	52,570	51,382
Total Loans Past Due	43,218	71,394	65,013
Current Loans	193,868	207,112	233,890
Total Loans	237,086	278,506	298,903
Loans 90 Days or More Past Due and Still Accruing	568	1,347	808
Real Estate - Residential [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Total Loans	355,920	346,480	343,332
Real Estate - Residential [Member] | Covered Loans [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Loans 30-59 Days Past Due	2,980	6,066	4,702
Loans 60-89 Days Past Due	1,727	3,396	3,349
Loans 90 or More Days Past Due	11,078	24,976	28,559
Total Loans Past Due	15,785	34,438	36,610
Current Loans	85,361	90,618	98,544
Total Loans	101,146	125,056	135,154
Loans 90 Days or More Past Due and Still Accruing	823	779	1,018
Consumer Installment Loans [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Total Loans	36,303	40,178	43,441
Consumer Installment Loans [Member] | Covered Loans [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Loans 30-59 Days Past Due	49	45	56
Loans 60-89 Days Past Due	'	13	92
Loans 90 or More Days Past Due	311	258	255
Total Loans Past Due	360	316	403
Current Loans	587	1,044	1,251
Total Loans	$947	$1,360	$1,654

Loans_Summary_of_Impaired_Fina

Loans - Summary of Impaired Financial Receivables (Summary of Non-Covered Impaired Loans) (Detail) (USD $)	9 Months Ended		12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Nonaccrual loans	$200,000	'	'
Troubled debt restructurings not included above	20,200,000	23,300,000	23,900,000
Non-Covered Loan [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Nonaccrual loans	31,720,000	38,225,000	38,885,000
Troubled debt restructurings not included above	17,024,000	19,893,000	18,744,000
Total impaired loans	48,744,000	58,118,000	57,629,000
Impaired loans not requiring a related allowance	'	'	'
Impaired loans requiring a related allowance	48,744,000	58,118,000	57,629,000
Allowance related to impaired loans	5,180,000	7,681,000	5,115,000
Average investment in impaired loans	53,047,000	73,353,000	70,209,000
Interest income recognized on impaired loans	468,000	376,000	495,000
Foregone interest income on impaired loans	$388,000	$491,000	$718,000

Loans_Summary_of_Impaired_Fina1

Loans - Summary of Impaired Financial Receivables (Analysis of Non-Covered Impaired Loans) (Detail) (Non-Covered Loan [Member], USD $)	9 Months Ended		12 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Unpaid Contractual Principal Balance	$65,594	$79,403	$78,758
Recorded Investment With No Allowance	'	'	'
Recorded Investment With Allowance	48,744	58,118	57,629
Total impaired loans	48,744	58,118	57,629
Related Allowance	5,180	7,681	5,115
Average Recorded Investment	53,047	73,353	70,209
Commercial, Financial and Agricultural [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Unpaid Contractual Principal Balance	7,401	8,261	8,024
Recorded Investment With No Allowance	'	'	'
Recorded Investment With Allowance	4,719	5,089	4,940
Total impaired loans	4,719	5,089	4,940
Related Allowance	820	876	743
Average Recorded Investment	4,900	4,974	4,968
Real Estate - Construction and Development [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Unpaid Contractual Principal Balance	14,299	19,583	20,316
Recorded Investment With No Allowance	'	'	'
Recorded Investment With Allowance	6,155	9,682	11,016
Total impaired loans	6,155	9,682	11,016
Related Allowance	821	1,253	910
Average Recorded Investment	8,960	11,879	11,706
Real Estate - Commercial and Farmland [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Unpaid Contractual Principal Balance	18,628	25,346	25,076
Recorded Investment With No Allowance	'	'	'
Recorded Investment With Allowance	16,241	20,948	20,910
Total impaired loans	16,241	20,948	20,910
Related Allowance	1,999	2,907	2,191
Average Recorded Investment	18,079	33,070	30,638
Real Estate - Residential [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Unpaid Contractual Principal Balance	24,701	24,993	24,155
Recorded Investment With No Allowance	'	'	'
Recorded Investment With Allowance	21,174	21,304	19,848
Total impaired loans	21,174	21,304	19,848
Related Allowance	1,530	2,616	1,246
Average Recorded Investment	20,427	22,303	21,813
Consumer Installment Loans [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Unpaid Contractual Principal Balance	565	1,220	1,187
Recorded Investment With No Allowance	'	'	'
Recorded Investment With Allowance	455	1,095	915
Total impaired loans	455	1,095	915
Related Allowance	10	29	25
Average Recorded Investment	$681	$1,127	$1,084

Loans_Summary_of_Impaired_Fina2

Loans - Summary of Impaired Financial Receivables (Summary of Covered Impaired Loans) (Detail) (USD $)	9 Months Ended		12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Nonaccrual loans	$200,000	'	'
Troubled debt restructurings not included above	20,200,000	23,300,000	23,900,000
Covered Loans [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Nonaccrual loans	74,911,000	123,901,000	115,712,000
Troubled debt restructurings not included above	21,184,000	25,926,000	19,194,000
Total impaired loans	96,095,000	149,827,000	134,906,000
Impaired loans not requiring a related allowance	96,095,000	149,827,000	134,906,000
Impaired loans requiring a related allowance	'	'	'
Allowance related to impaired loans	'	'	'
Average investment in impaired loans	115,689,000	171,055,000	163,825,000
Interest income recognized on impaired loans	793,000	1,319,000	849,000
Foregone interest income on impaired loans	$286,000	$554,000	$491,000

Loans_Summary_of_Impaired_Fina3

Loans - Summary of Impaired Financial Receivables (Analysis of Covered Impaired Loans) (Detail) (Covered Loans [Member], USD $)	9 Months Ended		12 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Unpaid Contractual Principal Balance	$115,633	$206,439	$335,784
Recorded Investment With No Allowance	96,095	149,827	134,906
Recorded Investment With Allowance	'	'	'
Total impaired loans	96,095	149,827	134,906
Related Allowance	'	'	'
Average Recorded Investment	115,689	171,055	163,825
Commercial, Financial and Agricultural [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Unpaid Contractual Principal Balance	10,645	17,833	27,060
Recorded Investment With No Allowance	7,884	11,976	10,802
Recorded Investment With Allowance	'	'	'
Total impaired loans	7,884	11,976	10,802
Related Allowance	'	'	'
Average Recorded Investment	9,052	12,932	12,506
Real Estate - Construction and Development [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Unpaid Contractual Principal Balance	25,401	34,787	85,279
Recorded Investment With No Allowance	20,890	23,833	23,236
Recorded Investment With Allowance	'	'	'
Total impaired loans	20,890	23,833	23,236
Related Allowance	'	'	'
Average Recorded Investment	22,734	31,653	29,970
Real Estate - Commercial and Farmland [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Unpaid Contractual Principal Balance	51,105	98,909	159,493
Recorded Investment With No Allowance	43,279	72,802	64,231
Recorded Investment With Allowance	'	'	'
Total impaired loans	43,279	72,802	64,231
Related Allowance	'	'	'
Average Recorded Investment	54,292	82,430	78,790
Real Estate - Residential [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Unpaid Contractual Principal Balance	28,078	54,020	63,559
Recorded Investment With No Allowance	23,692	40,790	36,335
Recorded Investment With Allowance	'	'	'
Total impaired loans	23,692	40,790	36,335
Related Allowance	'	'	'
Average Recorded Investment	29,316	43,492	42,061
Consumer Installment Loans [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Unpaid Contractual Principal Balance	404	890	393
Recorded Investment With No Allowance	350	426	302
Recorded Investment With Allowance	'	'	'
Total impaired loans	350	426	302
Related Allowance	'	'	'
Average Recorded Investment	$295	$548	$498

Loans_Summary_of_Credit_Qualit

Loans - Summary of Credit Quality Indicate Financial Receivable (Non-Covered Loan Portfolio) (Detail) (USD $)	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2012
In Thousands, unless otherwise specified
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Loans portfolio by risk grade	$1,589,267	$1,450,635	$1,439,862
Non-Covered Loan [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Loans portfolio by risk grade	1,589,267	1,450,635	1,439,862
Non-Covered Loan [Member] | 10 [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Loans portfolio by risk grade	72,759	32,993	34,809
Non-Covered Loan [Member] | 15 [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Loans portfolio by risk grade	230,810	236,500	244,466
Non-Covered Loan [Member] | 20 [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Loans portfolio by risk grade	731,154	641,950	592,283
Non-Covered Loan [Member] | 23 [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Loans portfolio by risk grade	30,729	31,433	30,176
Non-Covered Loan [Member] | 25 [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Loans portfolio by risk grade	433,358	399,210	427,598
Non-Covered Loan [Member] | 30 [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Loans portfolio by risk grade	28,952	35,298	35,478
Non-Covered Loan [Member] | 40 [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Loans portfolio by risk grade	61,270	72,994	74,606
Non-Covered Loan [Member] | 50 [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Loans portfolio by risk grade	235	257	446
Non-Covered Loan [Member] | 60 [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Loans portfolio by risk grade	'	'	'
Commercial, Financial and Agricultural [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Loans portfolio by risk grade	244,991	174,217	189,374
Commercial, Financial and Agricultural [Member] | Non-Covered Loan [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Loans portfolio by risk grade	244,991	174,217	189,374
Commercial, Financial and Agricultural [Member] | Non-Covered Loan [Member] | 10 [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Loans portfolio by risk grade	65,033	24,623	26,291
Commercial, Financial and Agricultural [Member] | Non-Covered Loan [Member] | 15 [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Loans portfolio by risk grade	20,668	11,316	11,816
Commercial, Financial and Agricultural [Member] | Non-Covered Loan [Member] | 20 [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Loans portfolio by risk grade	89,216	79,522	80,681
Commercial, Financial and Agricultural [Member] | Non-Covered Loan [Member] | 23 [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Loans portfolio by risk grade	97	42	5
Commercial, Financial and Agricultural [Member] | Non-Covered Loan [Member] | 25 [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Loans portfolio by risk grade	60,407	49,071	62,377
Commercial, Financial and Agricultural [Member] | Non-Covered Loan [Member] | 30 [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Loans portfolio by risk grade	3,019	2,343	1,508
Commercial, Financial and Agricultural [Member] | Non-Covered Loan [Member] | 40 [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Loans portfolio by risk grade	6,326	7,200	6,436
Commercial, Financial and Agricultural [Member] | Non-Covered Loan [Member] | 50 [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Loans portfolio by risk grade	225	100	260
Commercial, Financial and Agricultural [Member] | Non-Covered Loan [Member] | 60 [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Loans portfolio by risk grade	'	'	'
Real Estate - Construction and Development [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Loans portfolio by risk grade	132,277	114,199	125,315
Real Estate - Construction and Development [Member] | Non-Covered Loan [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Loans portfolio by risk grade	132,277	114,199	125,315
Real Estate - Construction and Development [Member] | Non-Covered Loan [Member] | 15 [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Loans portfolio by risk grade	5,080	4,373	4,532
Real Estate - Construction and Development [Member] | Non-Covered Loan [Member] | 20 [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Loans portfolio by risk grade	37,765	31,413	33,603
Real Estate - Construction and Development [Member] | Non-Covered Loan [Member] | 23 [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Loans portfolio by risk grade	7,085	8,521	7,667
Real Estate - Construction and Development [Member] | Non-Covered Loan [Member] | 25 [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Loans portfolio by risk grade	72,942	52,577	59,013
Real Estate - Construction and Development [Member] | Non-Covered Loan [Member] | 30 [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Loans portfolio by risk grade	2,264	3,394	7,948
Real Estate - Construction and Development [Member] | Non-Covered Loan [Member] | 40 [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Loans portfolio by risk grade	7,141	13,765	12,396
Real Estate - Construction and Development [Member] | Non-Covered Loan [Member] | 50 [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Loans portfolio by risk grade	'	156	156
Real Estate - Construction and Development [Member] | Non-Covered Loan [Member] | 60 [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Loans portfolio by risk grade	'	'	'
Real Estate - Commercial and Farmland [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Loans portfolio by risk grade	799,149	732,322	713,240
Real Estate - Commercial and Farmland [Member] | Non-Covered Loan [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Loans portfolio by risk grade	799,149	732,322	713,240
Real Estate - Commercial and Farmland [Member] | Non-Covered Loan [Member] | 10 [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Loans portfolio by risk grade	278	309	220
Real Estate - Commercial and Farmland [Member] | Non-Covered Loan [Member] | 15 [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Loans portfolio by risk grade	147,355	147,966	152,678
Real Estate - Commercial and Farmland [Member] | Non-Covered Loan [Member] | 20 [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Loans portfolio by risk grade	421,669	351,997	324,270
Real Estate - Commercial and Farmland [Member] | Non-Covered Loan [Member] | 23 [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Loans portfolio by risk grade	10,054	9,012	8,773
Real Estate - Commercial and Farmland [Member] | Non-Covered Loan [Member] | 25 [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Loans portfolio by risk grade	183,371	176,395	184,146
Real Estate - Commercial and Farmland [Member] | Non-Covered Loan [Member] | 30 [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Loans portfolio by risk grade	12,089	19,401	14,742
Real Estate - Commercial and Farmland [Member] | Non-Covered Loan [Member] | 40 [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Loans portfolio by risk grade	24,333	27,242	28,411
Real Estate - Commercial and Farmland [Member] | Non-Covered Loan [Member] | 60 [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Loans portfolio by risk grade	'	'	'
Real Estate - Residential [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Loans portfolio by risk grade	355,920	346,480	343,332
Real Estate - Residential [Member] | Non-Covered Loan [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Loans portfolio by risk grade	355,920	346,480	343,332
Real Estate - Residential [Member] | Non-Covered Loan [Member] | 10 [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Loans portfolio by risk grade	420	464	411
Real Estate - Residential [Member] | Non-Covered Loan [Member] | 15 [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Loans portfolio by risk grade	56,464	71,254	74,040
Real Estate - Residential [Member] | Non-Covered Loan [Member] | 20 [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Loans portfolio by risk grade	142,186	114,418	105,531
Real Estate - Residential [Member] | Non-Covered Loan [Member] | 23 [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Loans portfolio by risk grade	13,275	13,788	13,650
Real Estate - Residential [Member] | Non-Covered Loan [Member] | 25 [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Loans portfolio by risk grade	109,604	113,591	113,560
Real Estate - Residential [Member] | Non-Covered Loan [Member] | 30 [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Loans portfolio by risk grade	11,427	9,672	10,535
Real Estate - Residential [Member] | Non-Covered Loan [Member] | 40 [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Loans portfolio by risk grade	22,534	23,292	25,583
Real Estate - Residential [Member] | Non-Covered Loan [Member] | 50 [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Loans portfolio by risk grade	10	1	22
Real Estate - Residential [Member] | Non-Covered Loan [Member] | 60 [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Loans portfolio by risk grade	'	'	'
Consumer Installment Loans [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Loans portfolio by risk grade	36,303	40,178	43,441
Consumer Installment Loans [Member] | Non-Covered Loan [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Loans portfolio by risk grade	36,303	40,178	43,441
Consumer Installment Loans [Member] | Non-Covered Loan [Member] | 10 [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Loans portfolio by risk grade	7,028	7,597	7,887
Consumer Installment Loans [Member] | Non-Covered Loan [Member] | 15 [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Loans portfolio by risk grade	1,243	1,591	1,400
Consumer Installment Loans [Member] | Non-Covered Loan [Member] | 20 [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Loans portfolio by risk grade	19,691	21,361	23,038
Consumer Installment Loans [Member] | Non-Covered Loan [Member] | 23 [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Loans portfolio by risk grade	218	70	81
Consumer Installment Loans [Member] | Non-Covered Loan [Member] | 25 [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Loans portfolio by risk grade	7,034	7,576	8,502
Consumer Installment Loans [Member] | Non-Covered Loan [Member] | 30 [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Loans portfolio by risk grade	153	488	745
Consumer Installment Loans [Member] | Non-Covered Loan [Member] | 40 [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Loans portfolio by risk grade	936	1,495	1,780
Consumer Installment Loans [Member] | Non-Covered Loan [Member] | 50 [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Loans portfolio by risk grade	'	'	8
Consumer Installment Loans [Member] | Non-Covered Loan [Member] | 60 [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Loans portfolio by risk grade	'	'	'
Other [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Loans portfolio by risk grade	20,627	43,239	25,160
Other [Member] | Non-Covered Loan [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Loans portfolio by risk grade	20,627	43,239	25,160
Other [Member] | Non-Covered Loan [Member] | 20 [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Loans portfolio by risk grade	20,627	43,239	25,160
Other [Member] | Non-Covered Loan [Member] | 60 [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Loans portfolio by risk grade	'	'	'

Loans_Summary_of_Credit_Qualit1

Loans - Summary of Credit Quality Indicate Financial Receivable (Covered Loan Portfolio) (Detail) (USD $)	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2012
In Thousands, unless otherwise specified
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Loans portfolio by risk grade	$1,589,267	$1,450,635	$1,439,862
Covered Loans [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Loans portfolio by risk grade	417,649	507,712	546,234
Covered Loans [Member] | 10 [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Loans portfolio by risk grade	'	'	861
Covered Loans [Member] | 15 [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Loans portfolio by risk grade	1,761	2,323	2,516
Covered Loans [Member] | 20 [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Loans portfolio by risk grade	71,049	84,918	94,548
Covered Loans [Member] | 23 [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Loans portfolio by risk grade	20,876	12,830	7,783
Covered Loans [Member] | 25 [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Loans portfolio by risk grade	163,737	184,830	206,782
Covered Loans [Member] | 30 [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Loans portfolio by risk grade	40,990	62,106	56,401
Covered Loans [Member] | 40 [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Loans portfolio by risk grade	119,236	160,705	177,343
Covered Loans [Member] | 50 [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Loans portfolio by risk grade	'	'	'
Covered Loans [Member] | 60 [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Loans portfolio by risk grade	'	'	'
Commercial, Financial and Agricultural [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Loans portfolio by risk grade	244,991	174,217	189,374
Commercial, Financial and Agricultural [Member] | Covered Loans [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Loans portfolio by risk grade	27,768	32,606	37,167
Commercial, Financial and Agricultural [Member] | Covered Loans [Member] | 15 [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Loans portfolio by risk grade	'	'	91
Commercial, Financial and Agricultural [Member] | Covered Loans [Member] | 20 [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Loans portfolio by risk grade	2,697	3,997	4,970
Commercial, Financial and Agricultural [Member] | Covered Loans [Member] | 23 [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Loans portfolio by risk grade	135	28	30
Commercial, Financial and Agricultural [Member] | Covered Loans [Member] | 25 [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Loans portfolio by risk grade	7,609	10,013	11,986
Commercial, Financial and Agricultural [Member] | Covered Loans [Member] | 30 [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Loans portfolio by risk grade	1,485	4,294	4,063
Commercial, Financial and Agricultural [Member] | Covered Loans [Member] | 40 [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Loans portfolio by risk grade	15,842	14,274	16,027
Commercial, Financial and Agricultural [Member] | Covered Loans [Member] | 50 [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Loans portfolio by risk grade	'	'	'
Commercial, Financial and Agricultural [Member] | Covered Loans [Member] | 60 [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Loans portfolio by risk grade	'	'	'
Real Estate - Construction and Development [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Loans portfolio by risk grade	132,277	114,199	125,315
Real Estate - Construction and Development [Member] | Covered Loans [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Loans portfolio by risk grade	50,702	70,184	73,356
Real Estate - Construction and Development [Member] | Covered Loans [Member] | 10 [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Loans portfolio by risk grade	'	'	8
Real Estate - Construction and Development [Member] | Covered Loans [Member] | 15 [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Loans portfolio by risk grade	22	39	44
Real Estate - Construction and Development [Member] | Covered Loans [Member] | 20 [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Loans portfolio by risk grade	11,347	12,194	13,950
Real Estate - Construction and Development [Member] | Covered Loans [Member] | 23 [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Loans portfolio by risk grade	1,080	1,174	1,226
Real Estate - Construction and Development [Member] | Covered Loans [Member] | 25 [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Loans portfolio by risk grade	7,360	19,216	18,921
Real Estate - Construction and Development [Member] | Covered Loans [Member] | 30 [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Loans portfolio by risk grade	5,505	7,214	7,494
Real Estate - Construction and Development [Member] | Covered Loans [Member] | 40 [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Loans portfolio by risk grade	25,388	30,347	31,713
Real Estate - Construction and Development [Member] | Covered Loans [Member] | 50 [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Loans portfolio by risk grade	'	'	'
Real Estate - Construction and Development [Member] | Covered Loans [Member] | 60 [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Loans portfolio by risk grade	'	'	'
Real Estate - Commercial and Farmland [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Loans portfolio by risk grade	799,149	732,322	713,240
Real Estate - Commercial and Farmland [Member] | Covered Loans [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Loans portfolio by risk grade	237,086	278,506	298,903
Real Estate - Commercial and Farmland [Member] | Covered Loans [Member] | 15 [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Loans portfolio by risk grade	1,098	1,640	1,673
Real Estate - Commercial and Farmland [Member] | Covered Loans [Member] | 20 [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Loans portfolio by risk grade	34,252	37,098	40,912
Real Estate - Commercial and Farmland [Member] | Covered Loans [Member] | 23 [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Loans portfolio by risk grade	16,708	9,576	4,638
Real Estate - Commercial and Farmland [Member] | Covered Loans [Member] | 25 [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Loans portfolio by risk grade	108,886	114,849	130,155
Real Estate - Commercial and Farmland [Member] | Covered Loans [Member] | 30 [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Loans portfolio by risk grade	24,790	38,665	35,764
Real Estate - Commercial and Farmland [Member] | Covered Loans [Member] | 40 [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Loans portfolio by risk grade	51,352	76,678	85,761
Real Estate - Commercial and Farmland [Member] | Covered Loans [Member] | 50 [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Loans portfolio by risk grade	'	'	'
Real Estate - Commercial and Farmland [Member] | Covered Loans [Member] | 60 [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Loans portfolio by risk grade	'	'	'
Real Estate - Residential [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Loans portfolio by risk grade	355,920	346,480	343,332
Real Estate - Residential [Member] | Covered Loans [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Loans portfolio by risk grade	101,146	125,056	135,154
Real Estate - Residential [Member] | Covered Loans [Member] | 10 [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Loans portfolio by risk grade	'	'	853
Real Estate - Residential [Member] | Covered Loans [Member] | 15 [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Loans portfolio by risk grade	641	644	708
Real Estate - Residential [Member] | Covered Loans [Member] | 20 [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Loans portfolio by risk grade	22,545	31,337	34,397
Real Estate - Residential [Member] | Covered Loans [Member] | 23 [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Loans portfolio by risk grade	2,902	2,052	1,889
Real Estate - Residential [Member] | Covered Loans [Member] | 25 [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Loans portfolio by risk grade	39,632	40,194	44,999
Real Estate - Residential [Member] | Covered Loans [Member] | 30 [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Loans portfolio by risk grade	9,196	11,883	9,016
Real Estate - Residential [Member] | Covered Loans [Member] | 40 [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Loans portfolio by risk grade	26,230	38,946	43,292
Real Estate - Residential [Member] | Covered Loans [Member] | 50 [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Loans portfolio by risk grade	'	'	'
Real Estate - Residential [Member] | Covered Loans [Member] | 60 [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Loans portfolio by risk grade	'	'	'
Consumer Installment Loans [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Loans portfolio by risk grade	36,303	40,178	43,441
Consumer Installment Loans [Member] | Covered Loans [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Loans portfolio by risk grade	947	1,360	1,654
Consumer Installment Loans [Member] | Covered Loans [Member] | 20 [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Loans portfolio by risk grade	208	292	319
Consumer Installment Loans [Member] | Covered Loans [Member] | 23 [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Loans portfolio by risk grade	51	'	'
Consumer Installment Loans [Member] | Covered Loans [Member] | 25 [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Loans portfolio by risk grade	250	558	721
Consumer Installment Loans [Member] | Covered Loans [Member] | 30 [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Loans portfolio by risk grade	14	50	64
Consumer Installment Loans [Member] | Covered Loans [Member] | 40 [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Loans portfolio by risk grade	424	460	550
Consumer Installment Loans [Member] | Covered Loans [Member] | 50 [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Loans portfolio by risk grade	'	'	'
Consumer Installment Loans [Member] | Covered Loans [Member] | 60 [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Loans portfolio by risk grade	'	'	'
Other [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Loans portfolio by risk grade	20,627	43,239	25,160
Other [Member] | Covered Loans [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Loans portfolio by risk grade	'	'	'
Other [Member] | Covered Loans [Member] | 10 [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Loans portfolio by risk grade	'	'	'
Other [Member] | Covered Loans [Member] | 15 [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Loans portfolio by risk grade	'	'	'
Other [Member] | Covered Loans [Member] | 20 [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Loans portfolio by risk grade	'	'	'
Other [Member] | Covered Loans [Member] | 23 [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Loans portfolio by risk grade	'	'	'
Other [Member] | Covered Loans [Member] | 25 [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Loans portfolio by risk grade	'	'	'
Other [Member] | Covered Loans [Member] | 30 [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Loans portfolio by risk grade	'	'	'
Other [Member] | Covered Loans [Member] | 40 [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Loans portfolio by risk grade	'	'	'
Other [Member] | Covered Loans [Member] | 50 [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Loans portfolio by risk grade	'	'	'
Other [Member] | Covered Loans [Member] | 60 [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Loans portfolio by risk grade	'	'	'

Loans_Summary_of_Trouble_Debt_

Loans - Summary of Trouble Debt Restructuring by Loan Class (Detail) (USD $)	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2012
In Thousands, unless otherwise specified
Financing Receivable, Modifications [Line Items]	'	'	'
Troubled debt restructuring loans	$20,200	$23,900	$23,300
Accruing Loans [Member]	'	'	'
Financing Receivable, Modifications [Line Items]	'	'	'
Number of contracts	64	55	51
Troubled debt restructuring loans	17,024	18,744	19,893
Accruing Loans [Member] | Commercial, Financial and Agricultural [Member]	'	'	'
Financing Receivable, Modifications [Line Items]	'	'	'
Number of contracts	4	5	5
Troubled debt restructuring loans	521	802	804
Accruing Loans [Member] | Real Estate - Construction and Development [Member]	'	'	'
Financing Receivable, Modifications [Line Items]	'	'	'
Number of contracts	8	5	4
Troubled debt restructuring loans	1,926	1,735	1,481
Accruing Loans [Member] | Real Estate - Commercial and Farmland [Member]	'	'	'
Financing Receivable, Modifications [Line Items]	'	'	'
Number of contracts	16	16	15
Troubled debt restructuring loans	6,693	8,947	9,540
Accruing Loans [Member] | Real Estate - Residential [Member]	'	'	'
Financing Receivable, Modifications [Line Items]	'	'	'
Number of contracts	35	28	27
Troubled debt restructuring loans	7,871	7,254	8,068
Accruing Loans [Member] | Consumer Installment Loans [Member]	'	'	'
Financing Receivable, Modifications [Line Items]	'	'	'
Number of contracts	1	1	'
Troubled debt restructuring loans	13	6	'
Non-Accruing Loans [Member]	'	'	'
Financing Receivable, Modifications [Line Items]	'	'	'
Number of contracts	16	5	3
Troubled debt restructuring loans	3,150	5,171	3,390
Non-Accruing Loans [Member] | Commercial, Financial and Agricultural [Member]	'	'	'
Financing Receivable, Modifications [Line Items]	'	'	'
Number of contracts	3	'	'
Troubled debt restructuring loans	533	'	'
Non-Accruing Loans [Member] | Real Estate - Construction and Development [Member]	'	'	'
Financing Receivable, Modifications [Line Items]	'	'	'
Number of contracts	1	'	'
Troubled debt restructuring loans	29	'	'
Non-Accruing Loans [Member] | Real Estate - Commercial and Farmland [Member]	'	'	'
Financing Receivable, Modifications [Line Items]	'	'	'
Number of contracts	3	3	1
Troubled debt restructuring loans	1,858	4,149	2,770
Non-Accruing Loans [Member] | Real Estate - Residential [Member]	'	'	'
Financing Receivable, Modifications [Line Items]	'	'	'
Number of contracts	7	2	2
Troubled debt restructuring loans	704	1,022	620
Non-Accruing Loans [Member] | Consumer Installment Loans [Member]	'	'	'
Financing Receivable, Modifications [Line Items]	'	'	'
Number of contracts	2	'	'
Troubled debt restructuring loans	$26	'	'

Loans_Summary_of_Troubled_Debt

Loans - Summary of Troubled Debt Restructuring by Loan Class, Classified Separately Under Terms (Detail) (USD $)	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2012
In Thousands, unless otherwise specified	Contract	Contract	Contract
Loans Currently Paying Under Restructured Terms [Member]	'	'	'
Financing Receivable, Modifications [Line Items]	'	'	'
Number of contracts	56	54	50
Troubled debt restructuring loans	$16,258	$18,738	$19,893
Loans Currently Paying Under Restructured Terms [Member] | Commercial, Financial and Agricultural [Member]	'	'	'
Financing Receivable, Modifications [Line Items]	'	'	'
Number of contracts	3	5	5
Troubled debt restructuring loans	508	802	804
Loans Currently Paying Under Restructured Terms [Member] | Real Estate - Construction and Development [Member]	'	'	'
Financing Receivable, Modifications [Line Items]	'	'	'
Number of contracts	6	5	4
Troubled debt restructuring loans	1,881	1,735	1,481
Loans Currently Paying Under Restructured Terms [Member] | Real Estate - Commercial and Farmland [Member]	'	'	'
Financing Receivable, Modifications [Line Items]	'	'	'
Number of contracts	14	16	15
Troubled debt restructuring loans	6,550	8,947	9,540
Loans Currently Paying Under Restructured Terms [Member] | Real Estate - Residential [Member]	'	'	'
Financing Receivable, Modifications [Line Items]	'	'	'
Number of contracts	31	28	26
Troubled debt restructuring loans	7,282	7,254	8,068
Loans Currently Paying Under Restructured Terms [Member] | Consumer Installment Loans [Member]	'	'	'
Financing Receivable, Modifications [Line Items]	'	'	'
Number of contracts	2	'	'
Troubled debt restructuring loans	37	'	'
Loans that have Defaulted Under Restructured Terms [Member]	'	'	'
Financing Receivable, Modifications [Line Items]	'	'	'
Number of contracts	24	6	4
Troubled debt restructuring loans	3,916	5,177	3,390
Loans that have Defaulted Under Restructured Terms [Member] | Commercial, Financial and Agricultural [Member]	'	'	'
Financing Receivable, Modifications [Line Items]	'	'	'
Number of contracts	4	'	'
Troubled debt restructuring loans	546	'	'
Loans that have Defaulted Under Restructured Terms [Member] | Real Estate - Construction and Development [Member]	'	'	'
Financing Receivable, Modifications [Line Items]	'	'	'
Number of contracts	3	'	'
Troubled debt restructuring loans	74	'	'
Loans that have Defaulted Under Restructured Terms [Member] | Real Estate - Commercial and Farmland [Member]	'	'	'
Financing Receivable, Modifications [Line Items]	'	'	'
Number of contracts	5	3	1
Troubled debt restructuring loans	2,001	4,149	2,770
Loans that have Defaulted Under Restructured Terms [Member] | Real Estate - Residential [Member]	'	'	'
Financing Receivable, Modifications [Line Items]	'	'	'
Number of contracts	11	2	3
Troubled debt restructuring loans	1,293	1,022	620
Loans that have Defaulted Under Restructured Terms [Member] | Consumer Installment Loans [Member]	'	'	'
Financing Receivable, Modifications [Line Items]	'	'	'
Number of contracts	1	1	'
Troubled debt restructuring loans	$2	$6	'

Loans_Summary_of_Troubled_Debt1

Loans - Summary of Troubled Debt Restructuring by Concessions Made Types (Detail) (USD $)	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2012
In Thousands, unless otherwise specified
Financing Receivable, Modifications [Line Items]	'	'	'
Troubled debt restructuring loans	$20,200	$23,900	$23,300
Accruing Loans [Member]	'	'	'
Financing Receivable, Modifications [Line Items]	'	'	'
Number of contracts	64	55	51
Troubled debt restructuring loans	17,024	18,744	19,893
Accruing Loans [Member] | Forbearance of Interest [Member]	'	'	'
Financing Receivable, Modifications [Line Items]	'	'	'
Number of contracts	9	2	2
Troubled debt restructuring loans	2,135	1,873	1,902
Accruing Loans [Member] | Forgiveness of Principal [Member]	'	'	'
Financing Receivable, Modifications [Line Items]	'	'	'
Number of contracts	3	3	3
Troubled debt restructuring loans	1,479	1,518	1,516
Accruing Loans [Member] | Payment Modification Only [Member]	'	'	'
Financing Receivable, Modifications [Line Items]	'	'	'
Number of contracts	2	2	2
Troubled debt restructuring loans	370	376	1,292
Accruing Loans [Member] | Rate Reduction Only [Member]	'	'	'
Financing Receivable, Modifications [Line Items]	'	'	'
Number of contracts	14	11	10
Troubled debt restructuring loans	7,146	7,075	5,889
Accruing Loans [Member] | Rate Reduction, Forbearance of Interest [Member]	'	'	'
Financing Receivable, Modifications [Line Items]	'	'	'
Number of contracts	18	18	15
Troubled debt restructuring loans	2,878	4,061	4,371
Accruing Loans [Member] | Rate Reduction, Forbearance of Principal [Member]	'	'	'
Financing Receivable, Modifications [Line Items]	'	'	'
Number of contracts	18	18	18
Troubled debt restructuring loans	3,016	3,798	4,874
Accruing Loans [Member] | Rate Reduction, Payment Modification [Member]	'	'	'
Financing Receivable, Modifications [Line Items]	'	'	'
Number of contracts	'	1	1
Troubled debt restructuring loans	'	43	49
Non-Accruing Loans [Member]	'	'	'
Financing Receivable, Modifications [Line Items]	'	'	'
Number of contracts	16	5	3
Troubled debt restructuring loans	3,150	5,171	3,390
Non-Accruing Loans [Member] | Forbearance of Interest [Member]	'	'	'
Financing Receivable, Modifications [Line Items]	'	'	'
Number of contracts	2	'	'
Troubled debt restructuring loans	101	'	'
Non-Accruing Loans [Member] | Forgiveness of Principal [Member]	'	'	'
Financing Receivable, Modifications [Line Items]	'	'	'
Number of contracts	1	1	1
Troubled debt restructuring loans	145	372	369
Non-Accruing Loans [Member] | Payment Modification Only [Member]	'	'	'
Financing Receivable, Modifications [Line Items]	'	'	'
Number of contracts	'	'	1
Troubled debt restructuring loans	'	'	251
Non-Accruing Loans [Member] | Rate Reduction Only [Member]	'	'	'
Financing Receivable, Modifications [Line Items]	'	'	'
Number of contracts	2	1	'
Troubled debt restructuring loans	496	177	'
Non-Accruing Loans [Member] | Rate Reduction, Forbearance of Interest [Member]	'	'	'
Financing Receivable, Modifications [Line Items]	'	'	'
Number of contracts	10	2	1
Troubled debt restructuring loans	2,379	3,420	2,770
Non-Accruing Loans [Member] | Rate Reduction, Forbearance of Principal [Member]	'	'	'
Financing Receivable, Modifications [Line Items]	'	'	'
Number of contracts	'	'	'
Troubled debt restructuring loans	'	'	'
Non-Accruing Loans [Member] | Rate Reduction, Payment Modification [Member]	'	'	'
Financing Receivable, Modifications [Line Items]	'	'	'
Number of contracts	1	1	'
Troubled debt restructuring loans	$29	$1,202	'

Loans_Summary_of_Troubled_Debt2

Loans - Summary of Troubled Debt Restructurings by Collateral Types (Detail) (USD $)	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2012
In Thousands, unless otherwise specified
Financing Receivable, Modifications [Line Items]	'	'	'
Troubled debt restructuring loans	$20,200	$23,900	$23,300
Accruing Loans [Member]	'	'	'
Financing Receivable, Modifications [Line Items]	'	'	'
Number of contracts	64	55	51
Troubled debt restructuring loans	17,024	18,744	19,893
Accruing Loans [Member] | Warehouse [Member]	'	'	'
Financing Receivable, Modifications [Line Items]	'	'	'
Number of contracts	3	3	3
Troubled debt restructuring loans	1,065	1,692	1,621
Accruing Loans [Member] | Raw Land [Member]	'	'	'
Financing Receivable, Modifications [Line Items]	'	'	'
Number of contracts	3	2	2
Troubled debt restructuring loans	1,337	1,337	1,349
Accruing Loans [Member] | Agricultural Land [Member]	'	'	'
Financing Receivable, Modifications [Line Items]	'	'	'
Number of contracts	2	'	'
Troubled debt restructuring loans	380	'	'
Accruing Loans [Member] | Hotel & Motel [Member]	'	'	'
Financing Receivable, Modifications [Line Items]	'	'	'
Number of contracts	3	3	3
Troubled debt restructuring loans	2,219	2,318	2,362
Accruing Loans [Member] | Office [Member]	'	'	'
Financing Receivable, Modifications [Line Items]	'	'	'
Number of contracts	4	4	2
Troubled debt restructuring loans	1,924	2,105	1,503
Accruing Loans [Member] | Retail, Including Strip Centers [Member]	'	'	'
Financing Receivable, Modifications [Line Items]	'	'	'
Number of contracts	4	6	7
Troubled debt restructuring loans	1,105	2,833	4,054
Accruing Loans [Member] | 1-4 Family Residential [Member]	'	'	'
Financing Receivable, Modifications [Line Items]	'	'	'
Number of contracts	40	31	30
Troubled debt restructuring loans	8,460	7,651	8,216
Accruing Loans [Member] | Life Insurance Policy [Member]	'	'	'
Financing Receivable, Modifications [Line Items]	'	'	'
Number of contracts	1	1	'
Troubled debt restructuring loans	250	250	'
Accruing Loans [Member] | Automobile/Equipment/Inventory [Member]	'	'	'
Financing Receivable, Modifications [Line Items]	'	'	'
Number of contracts	3	4	1
Troubled debt restructuring loans	36	508	38
Accruing Loans [Member] | Unsecured [Member]	'	'	'
Financing Receivable, Modifications [Line Items]	'	'	'
Number of contracts	1	1	2
Troubled debt restructuring loans	248	50	300
Accruing Loans [Member] | Inventory [Member]	'	'	'
Financing Receivable, Modifications [Line Items]	'	'	'
Number of contracts	'	'	1
Troubled debt restructuring loans	'	'	450
Non-Accruing Loans [Member]	'	'	'
Financing Receivable, Modifications [Line Items]	'	'	'
Number of contracts	16	5	3
Troubled debt restructuring loans	3,150	5,171	3,390
Non-Accruing Loans [Member] | Warehouse [Member]	'	'	'
Financing Receivable, Modifications [Line Items]	'	'	'
Number of contracts	1	1	'
Troubled debt restructuring loans	176	177	'
Non-Accruing Loans [Member] | Raw Land [Member]	'	'	'
Financing Receivable, Modifications [Line Items]	'	'	'
Number of contracts	1	'	'
Troubled debt restructuring loans	29	'	'
Non-Accruing Loans [Member] | Agricultural Land [Member]	'	'	'
Financing Receivable, Modifications [Line Items]	'	'	'
Number of contracts	'	'	'
Troubled debt restructuring loans	'	'	'
Non-Accruing Loans [Member] | Hotel & Motel [Member]	'	'	'
Financing Receivable, Modifications [Line Items]	'	'	'
Number of contracts	'	'	'
Troubled debt restructuring loans	'	'	'
Non-Accruing Loans [Member] | Office [Member]	'	'	'
Financing Receivable, Modifications [Line Items]	'	'	'
Number of contracts	'	1	1
Troubled debt restructuring loans	'	2,770	2,770
Non-Accruing Loans [Member] | Retail, Including Strip Centers [Member]	'	'	'
Financing Receivable, Modifications [Line Items]	'	'	'
Number of contracts	2	1	'
Troubled debt restructuring loans	1,682	1,202	'
Non-Accruing Loans [Member] | 1-4 Family Residential [Member]	'	'	'
Financing Receivable, Modifications [Line Items]	'	'	'
Number of contracts	7	2	2
Troubled debt restructuring loans	704	1,022	620
Non-Accruing Loans [Member] | Life Insurance Policy [Member]	'	'	'
Financing Receivable, Modifications [Line Items]	'	'	'
Number of contracts	'	'	'
Troubled debt restructuring loans	'	'	'
Non-Accruing Loans [Member] | Automobile/Equipment/Inventory [Member]	'	'	'
Financing Receivable, Modifications [Line Items]	'	'	'
Number of contracts	4	'	'
Troubled debt restructuring loans	509	'	'
Non-Accruing Loans [Member] | Unsecured [Member]	'	'	'
Financing Receivable, Modifications [Line Items]	'	'	'
Number of contracts	1	'	'
Troubled debt restructuring loans	$50	'	'

Loans_Schedule_of_Allowances_f

Loans - Schedule of Allowances for Loan Losses By Portfolio Segment (Detail) (USD $)	9 Months Ended		12 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Loans Receivable [Member]	'	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'	'
Beginning balance	$23,593	$35,156	$35,156
Provision for loan losses	8,747	24,360	28,451
Loans charged off	-9,693	-34,167	-41,163
Recoveries of loans previously charged off	1,207	552	1,149
Ending balance	23,854	25,901	23,593
Period-End Amount Allocated to [Member]	'	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'	'
Loans individually evaluated for impairment	4,849	5,556	4,554
Loans collectively evaluated for impairment	19,005	20,345	19,039
Ending balance	23,854	25,901	23,593
Loans [Member]	'	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'	'
Individually evaluated for impairment	38,705	44,988	45,320
Collectively evaluated for impairment	1,550,562	1,394,874	1,405,315
Ending balance	1,589,267	1,439,862	1,450,635
Commercial, Financial and Agricultural [Member] | Loans Receivable [Member]	'	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'	'
Beginning balance	2,439	2,918	2,918
Provision for loan losses	1,011	677	815
Loans charged off	-1,216	-889	-1,451
Recoveries of loans previously charged off	340	101	157
Ending balance	2,574	2,807	2,439
Commercial, Financial and Agricultural [Member] | Period-End Amount Allocated to [Member]	'	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'	'
Loans individually evaluated for impairment	741	610	659
Loans collectively evaluated for impairment	1,833	2,197	1,780
Ending balance	2,574	2,807	2,439
Commercial, Financial and Agricultural [Member] | Loans [Member]	'	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'	'
Individually evaluated for impairment	3,657	2,748	3,351
Collectively evaluated for impairment	241,334	186,626	170,866
Ending balance	244,991	189,374	174,217
Real Estate - Construction and Development [Member] | Loans Receivable [Member]	'	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'	'
Beginning balance	5,343	9,438	9,438
Provision for loan losses	2,127	4,954	5,245
Loans charged off	-1,598	-7,819	-9,380
Recoveries of loans previously charged off	88	23	40
Ending balance	5,960	6,596	5,343
Real Estate - Construction and Development [Member] | Period-End Amount Allocated to [Member]	'	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'	'
Loans individually evaluated for impairment	682	526	611
Loans collectively evaluated for impairment	5,278	6,070	4,732
Ending balance	5,960	6,596	5,343
Real Estate - Construction and Development [Member] | Loans [Member]	'	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'	'
Individually evaluated for impairment	3,524	5,510	7,617
Collectively evaluated for impairment	128,753	119,805	106,582
Ending balance	132,277	125,315	114,199
Real Estate - Commercial and Farmland [Member] | Loans Receivable [Member]	'	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'	'
Beginning balance	9,157	14,226	14,226
Provision for loan losses	2,632	13,087	15,000
Loans charged off	-2,873	-18,199	-20,551
Recoveries of loans previously charged off	18	32	482
Ending balance	8,934	9,146	9,157
Real Estate - Commercial and Farmland [Member] | Period-End Amount Allocated to [Member]	'	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'	'
Loans individually evaluated for impairment	1,997	2,315	2,228
Loans collectively evaluated for impairment	6,937	6,831	6,929
Ending balance	8,934	9,146	9,157
Real Estate - Commercial and Farmland [Member] | Loans [Member]	'	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'	'
Individually evaluated for impairment	14,605	21,552	21,332
Collectively evaluated for impairment	784,544	691,688	710,990
Ending balance	799,149	713,240	732,322
Real Estate - Residential [Member] | Loans Receivable [Member]	'	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'	'
Beginning balance	5,898	8,128	8,128
Provision for loan losses	2,966	4,936	6,267
Loans charged off	-3,430	-6,642	-8,722
Recoveries of loans previously charged off	520	199	225
Ending balance	5,954	6,621	5,898
Real Estate - Residential [Member] | Period-End Amount Allocated to [Member]	'	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'	'
Loans individually evaluated for impairment	1,429	2,105	1,056
Loans collectively evaluated for impairment	4,525	4,516	4,842
Ending balance	5,954	6,621	5,898
Real Estate - Residential [Member] | Loans [Member]	'	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'	'
Individually evaluated for impairment	16,919	15,178	13,020
Collectively evaluated for impairment	339,001	328,154	333,460
Ending balance	355,920	343,332	346,480
Consumer Installment Loans and Other [Member] | Loans Receivable [Member]	'	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'	'
Beginning balance	756	446	446
Provision for loan losses	11	706	1,124
Loans charged off	-576	-618	-1,059
Recoveries of loans previously charged off	241	197	245
Ending balance	432	731	756
Consumer Installment Loans and Other [Member] | Period-End Amount Allocated to [Member]	'	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'	'
Loans collectively evaluated for impairment	432	731	756
Ending balance	432	731	756
Consumer Installment Loans and Other [Member] | Loans [Member]	'	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'	'
Collectively evaluated for impairment	56,930	68,601	83,417
Ending balance	$56,930	$68,601	$83,417

Assets_Acquired_in_FDICAssiste2

Assets Acquired in FDIC-Assisted Acquisition - Additional Information (Detail)	34 Months Ended
	Jul. 31, 2012
	Acquisition
Business Combinations [Abstract]	'
Number of FDIC-assisted acquisitions participation	10

Assets_Acquired_in_FDICAssiste3

Assets Acquired in FDIC-Assisted Acquisitions - Schedule of Acquisition Details (Detail)	34 Months Ended
	Jul. 31, 2012
	Entity
American United Bank (AUB) [Member]	'
Business Acquisition [Line Items]	'
Bank Acquired	'American United Bank ("AUB")
Branches	1
Date Acquired	23-Oct-09
United Security Bank (USB) [Member]	'
Business Acquisition [Line Items]	'
Bank Acquired	'United Security Bank ("USB")
Branches	2
Date Acquired	6-Nov-09
Satilla Community Bank (SCB) [Member]	'
Business Acquisition [Line Items]	'
Bank Acquired	'Satilla Community Bank ("SCB")
Branches	1
Date Acquired	14-May-10
First Bank of Jacksonville (FBJ) [Member]	'
Business Acquisition [Line Items]	'
Bank Acquired	'First Bank of Jacksonville ("FBJ")
Branches	2
Date Acquired	22-Oct-10
Tifton Banking Company (TBC) [Member]	'
Business Acquisition [Line Items]	'
Bank Acquired	'Tifton Banking Company ("TBC")
Branches	1
Date Acquired	12-Nov-10
Darby Bank & Trust (DBT) [Member]	'
Business Acquisition [Line Items]	'
Bank Acquired	'Darby Bank & Trust ("DBT")
Branches	7
Date Acquired	12-Nov-10
High Trust Bank (HTB) [Member]	'
Business Acquisition [Line Items]	'
Bank Acquired	'High Trust Bank ("HTB")
Branches	2
Date Acquired	15-Jul-11
One Georgia Bank (OGB) [Member]	'
Business Acquisition [Line Items]	'
Bank Acquired	'One Georgia Bank ("OGB")
Branches	1
Date Acquired	15-Jul-11
Central Bank of Georgia (CBG) [Member]	'
Business Acquisition [Line Items]	'
Bank Acquired	'Central Bank of Georgia ("CBG")
Branches	5
Date Acquired	24-Feb-12
Montgomery Bank & Trust (MBT) [Member]	'
Business Acquisition [Line Items]	'
Bank Acquired	'Montgomery Bank & Trust ("MBT")
Branches	2
Date Acquired	6-Jul-12

Assets_Acquired_in_FDICAssiste4

Assets Acquired in FDIC-Assisted Acquisitions - Components of Covered Assets (Detail) (USD $)	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2012
In Thousands, unless otherwise specified
Covered loans	$482,259	$641,451	$699,229
Less: Credit risk adjustments	64,307	132,983	151,999
Less: Liquidity and rate adjustments	303	756	996
Total covered loans	417,649	507,712	546,234
OREO	64,184	105,347	106,979
Less: Fair value adjustments	11,632	17,074	18,084
Total covered OREO	52,552	88,273	88,895
Total covered assets	470,201	595,985	635,129
FDIC indemnification asset	81,763	159,724	198,440
American United Bank (AUB) [Member]	'	'	'
Covered loans	19,336	27,169	28,955
Less: Credit risk adjustments	915	2,481	2,532
Total covered loans	18,421	24,688	26,423
OREO	3,338	10,636	10,342
Less: Fair value adjustments	3	102	'
Total covered OREO	3,335	10,534	10,342
Total covered assets	21,756	35,222	36,765
FDIC indemnification asset	3,704	2,905	3,256
United Security Bank (USB) [Member]	'	'	'
Covered loans	21,168	27,286	33,145
Less: Credit risk adjustments	1,665	4,320	5,036
Total covered loans	19,503	22,966	28,109
OREO	3,066	7,087	7,641
Less: Fair value adjustments	139	99	99
Total covered OREO	2,927	6,988	7,542
Total covered assets	22,430	29,954	35,651
FDIC indemnification asset	2,796	6,619	8,408
Satilla Community Bank (SCB) [Member]	'	'	'
Covered loans	35,555	41,389	44,340
Less: Credit risk adjustments	1,902	3,285	3,892
Total covered loans	33,653	38,104	40,448
OREO	5,348	10,686	10,464
Less: Fair value adjustments	429	654	646
Total covered OREO	4,919	10,032	9,818
Total covered assets	38,572	48,136	50,266
FDIC indemnification asset	4,020	6,133	6,130
First Bank of Jacksonville (FBJ) [Member]	'	'	'
Covered loans	27,222	32,574	33,312
Less: Credit risk adjustments	3,965	6,204	6,299
Less: Liquidity and rate adjustments	'	27	43
Total covered loans	23,257	26,343	26,970
OREO	1,582	3,260	3,407
Less: Fair value adjustments	170	526	572
Total covered OREO	1,412	2,734	2,835
Total covered assets	24,669	29,077	29,805
FDIC indemnification asset	4,990	6,589	6,731
Darby Bank & Trust (DBT) [Member]	'	'	'
Covered loans	116,685	169,527	186,815
Less: Credit risk adjustments	21,739	41,631	47,598
Less: Liquidity and rate adjustments	'	207	331
Total covered loans	94,946	127,689	138,886
OREO	19,720	30,395	33,404
Less: Fair value adjustments	1,639	2,160	2,798
Total covered OREO	18,081	28,235	30,606
Total covered assets	113,027	155,924	169,492
FDIC indemnification asset	23,955	47,012	63,789
Tifton Banking Company (TBC) [Member]	'	'	'
Covered loans	35,588	46,796	51,084
Less: Credit risk adjustments	2,519	4,979	5,790
Less: Liquidity and rate adjustments	54	173	212
Total covered loans	33,015	41,644	45,082
OREO	5,912	11,089	10,110
Less: Fair value adjustments	843	1,381	1,533
Total covered OREO	5,069	9,708	8,577
Total covered assets	38,084	51,352	53,659
FDIC indemnification asset	4,315	8,073	15,559
High Trust Bank (HTB) [Member]	'	'	'
Covered loans	70,156	90,602	95,904
Less: Credit risk adjustments	8,232	16,072	18,727
Less: Liquidity and rate adjustments	41	52	56
Total covered loans	61,883	74,478	77,121
OREO	6,998	13,980	15,219
Less: Fair value adjustments	2,445	4,954	5,766
Total covered OREO	4,553	9,026	9,453
Total covered assets	66,436	83,504	86,574
FDIC indemnification asset	11,065	20,020	23,698
One Georgia Bank (OGB) [Member]	'	'	'
Covered loans	63,794	81,908	86,091
Less: Credit risk adjustments	6,658	17,127	18,719
Less: Liquidity and rate adjustments	108	136	146
Total covered loans	57,028	64,645	67,226
OREO	9,921	9,168	7,874
Less: Fair value adjustments	3,918	4,078	3,663
Total covered OREO	6,003	5,090	4,211
Total covered assets	63,031	69,735	71,437
FDIC indemnification asset	9,458	16,871	21,419
Central Bank of Georgia (CBG) [Member]	'	'	'
Covered loans	92,755	124,200	139,583
Less: Credit risk adjustments	16,712	36,884	43,406
Less: Liquidity and rate adjustments	100	161	208
Total covered loans	75,943	87,155	95,969
OREO	8,299	9,046	8,518
Less: Fair value adjustments	2,046	3,120	3,007
Total covered OREO	6,253	5,926	5,511
Total covered assets	82,196	93,081	101,480
FDIC indemnification asset	$17,460	$45,502	$49,450

Assets_Acquired_in_FDICAssiste5

Assets Acquired in FDIC-Assisted Acquisitions - Loan-by-Loan Basis Performance of Fair Value Adjustments (Detail) (USD $)	9 Months Ended		12 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Statement Of Partners Capital [Abstract]	'	'	'
Adjustments needed where the Company's initial estimate of cash flows were underestimated: (recorded with a reclassification from non-accretable difference to accretable discount)	$50,703	$16,210	$23,050
Adjustments needed where the Company's initial estimate of cash flows were overstated: (recorded through a provision for loan losses)	6,305	11,435	13,190
Adjustments needed where the Company's initial estimate of cash flows were underestimated: (recorded with a reclassification from non-accretable difference to accretable discount)	10,141	3,242	4,610
Adjustments needed where the Company's initial estimate of cash flows were overstated: (recorded through a provision for loan losses)	$1,261	$2,287	$2,638

Assets_Acquired_in_FDICAssiste6

Assets Acquired in FDIC-Assisted Acquisitions - Rollforward of Acquired Loans Deterioration of Credit Quality (Detail) (USD $)	9 Months Ended	12 Months Ended					9 Months Ended		12 Months Ended	9 Months Ended		12 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2012	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2012	Dec. 31, 2011	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
							Loans with Deterioration of Credit Quality [Member]	Loans with Deterioration of Credit Quality [Member]	Loans with Deterioration of Credit Quality [Member]	Loans without Deterioration of Credit Quality [Member]	Loans without Deterioration of Credit Quality [Member]	Loans without Deterioration of Credit Quality [Member]
Balance, beginning of year	$29,537	$29,537	$30,849	$16,698	$19,369	'	$282,737	$307,790	$307,790	$228,602	$266,966	$266,966
Change in estimate of cash flows, net of charge-offs or recoveries	'	'	'	'	'	'	30,371	-7,119	-17,712	11,554	3,861	1,376
Additions due to acquisitions	9,863	9,863	'	'	'	'	'	73,414	73,414	'	51,367	51,368
Other (loan payments, transfers, etc.)	'	'	'	'	'	'	-81,519	-70,402	-80,755	-53,870	-72,755	-91,108
Balance, end of year	$198,440	$159,724	$81,763	'	'	$242,394	$231,589	$303,683	$282,737	$186,286	$249,439	$228,602

Assets_Acquired_in_FDICAssiste7

Assets Acquired in FDIC-Assisted Acquisitions - Schedule of Changes in Accretable Discount Related Acquired Loan (Detail) (USD $)	9 Months Ended		12 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Transfers And Servicing [Abstract]	'	'	'
Balance, beginning of year	$16,698	$29,537	$29,537
Additions due to acquisitions	'	9,863	9,863
Accretion	-36,552	-36,241	-45,752
Other activity, net	50,703	16,210	23,050
Balance, end of year	$30,849	$19,369	$16,698

Assets_Acquired_in_FDICAssiste8

Assets Acquired in FDIC-Assisted Acquisitions - Changes in FDIC Shared Loss Receivable (Detail) (USD $)	9 Months Ended		12 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Banking And Thrift [Abstract]	'	'	'
Balance, beginning of year	$159,724	$242,394	$242,394
Indemnification asset recorded in acquisitions	'	52,654	52,654
Payments received from FDIC	-58,240	-97,399	-128,730
Effect of change in expected cash flows on covered assets	-19,721	791	-6,594
Balance, end of year	$81,763	$198,440	$159,724

Weighted_Average_Shares_Outsta2

Weighted Average Shares Outstanding - Summary of Weighted Average Number of Shares (Detail)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Earnings Per Share [Abstract]	'	'	'	'
Basic shares outstanding	23,901	23,819	23,883	23,800
Plus: Dilutive effect of ISOs	62	105	62	105
Plus: Dilutive effect of Restricted grants	353	49	353	49
Diluted shares outstanding	24,316	23,973	24,298	23,954

Other_Borrowings_Additional_In

Other Borrowings - Additional Information (Detail) (USD $)	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2012
In Thousands, unless otherwise specified
Debt Disclosure [Abstract]	'	'	'
Outstanding borrowings	$5,000	$0	$0

Commitments_Summary_of_Commitm

Commitments - Summary of Commitments to Extend Credit and Standby Letters of Credit (Detail) (USD $)	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2012
In Thousands, unless otherwise specified
Commitments And Contingencies Disclosure [Abstract]	'	'	'
Commitments to extend credit	$208,303	$180,733	$145,936
Standby letters of credit	$6,954	$6,788	$9,367

Accumulated_Other_Comprehensiv2

Accumulated Other Comprehensive Income - Summary of Accumulated Other Comprehensive Income (Detail) (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012
Accumulated Other Comprehensive Income (Loss) [Line Items]	'	'
Beginning balance	$6,607	$7,296
Reclassification for gains included in net income	-111	'
Current year changes	-7,027	41
Ending balance	-531	7,337
Unrealized Gain (Loss) on Derivatives [Member]	'	'
Accumulated Other Comprehensive Income (Loss) [Line Items]	'	'
Beginning balance	-23	856
Current year changes	1,098	-976
Ending balance	1,075	-120
Unrealized Gain (Loss) on Securities [Member]	'	'
Accumulated Other Comprehensive Income (Loss) [Line Items]	'	'
Beginning balance	6,630	6,440
Reclassification for gains included in net income	-111	'
Current year changes	-8,125	1,017
Ending balance	($1,606)	$7,457

Segment_Reporting_Schedule_of_

Segment Reporting - Schedule of Financial Information with Respect to Company's Reportable Business Segments (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	Dec. 31, 2012
Segment Reporting Information [Line Items]	'	'	'	'	'
Net interest income	$29,320	$28,238	$87,134	$84,846	'
Provision for loan losses	2,920	6,540	10,008	26,647	'
Noninterest income	12,288	9,831	35,032	45,970	'
Noninterest expense	'	'	'	'	'
Salaries and employee benefits	14,412	13,766	41,599	37,337	'
Equipment and occupancy expenses	3,149	3,340	9,058	9,555	'
Data processing and telecommunications expenses	3,072	2,599	8,478	7,429	'
Other expenses	8,116	8,320	25,186	35,358	'
Total noninterest expense	28,749	28,810	84,321	89,679	'
Income before income tax expense	9,939	2,719	27,837	14,490	'
Income tax expense	3,262	816	9,197	4,727	'
Net income	6,677	1,903	18,640	9,763	'
Less preferred stock dividends	443	827	1,326	2,459	'
Net income available to common shareholders	6,234	1,076	17,314	7,304	'
Total assets	2,818,502	2,949,383	2,818,502	2,949,383	3,019,052
Stockholders' equity	290,356	299,206	290,356	299,206	279,017
Retail Banking [Member]	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'
Net interest income	28,089	27,953	84,372	84,243	'
Provision for loan losses	2,920	6,540	10,008	26,647	'
Noninterest income	7,054	6,091	20,333	37,749	'
Noninterest expense	'	'	'	'	'
Salaries and employee benefits	10,799	11,446	32,314	32,435	'
Equipment and occupancy expenses	3,029	3,190	8,575	9,250	'
Data processing and telecommunications expenses	2,908	2,510	8,013	7,222	'
Other expenses	7,473	8,706	22,807	34,470	'
Total noninterest expense	24,209	25,852	71,709	83,377	'
Income before income tax expense	8,014	1,652	22,988	11,968	'
Income tax expense	2,588	443	7,500	3,845	'
Net income	5,426	1,209	15,488	8,123	'
Less preferred stock dividends	443	827	1,326	2,459	'
Net income available to common shareholders	4,983	382	14,162	5,664	'
Total assets	2,707,200	2,947,004	2,707,200	2,947,004	'
Stockholders' equity	250,863	299,221	250,863	299,221	'
Mortgage Banking [Member]	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'
Net interest income	1,231	285	2,762	603	'
Noninterest income	5,234	3,740	14,699	8,221	'
Noninterest expense	'	'	'	'	'
Salaries and employee benefits	3,613	2,320	9,285	4,902	'
Equipment and occupancy expenses	120	150	483	305	'
Data processing and telecommunications expenses	164	89	465	207	'
Other expenses	643	9,105	2,379	888	'
Total noninterest expense	4,540	2,958	12,612	6,302	'
Income before income tax expense	1,925	1,067	4,849	2,522	'
Income tax expense	674	373	1,697	882	'
Net income	1,251	694	3,152	1,640	'
Net income available to common shareholders	1,251	694	3,152	1,640	'
Total assets	111,302	2,379	111,302	2,379	'
Stockholders' equity	$39,493	($15)	$39,493	($15)	'