MidWestOne Financial (MOFG) 10-K 5 Mar 15 2014 FY Annual report Financial data

Document_and_Entity_Informatio

Document and Entity Information Document (USD $)	12 Months Ended
In Millions, except Share data, unless otherwise specified	Dec. 31, 2014	Mar. 03, 2015	Jun. 30, 2014
Entity Information [Line Items]
Entity Registrant Name	MIDWESTONE FINANCIAL GROUP, INC.
Entity Central Index Key	1412665
Current Fiscal Year End Date	-19
Entity Filer Category	Accelerated Filer
Document Type	10-K
Document Period End Date	31-Dec-14
Document Fiscal Year Focus	2014
Document Fiscal Period Focus	FY
Amendment Flag	FALSE
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Well-known Seasoned Issuer	No
Entity Public Float			$165.40
Entity Common Stock, Shares Outstanding		8,370,309

Consolidated_Balance_Sheets

Consolidated Balance Sheets (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Assets:
Cash and due from banks	$23,028	$24,516
Interest-bearing deposits in banks	381	374
Cash and cash equivalents	23,409	24,890
Investment securities:
Available for sale	474,942	498,561
Held to maturity (fair value of $51,253 as of December 31, 2014 and $30,191 as of December 31, 2013)	51,524	32,625
Loans held for sale	801	357
Loans	1,132,519	1,088,412
Allowance for loan losses	-16,363	-16,179
Net loans	1,116,156	1,072,233
Loan pool participations, net	19,332	25,533
Premises and equipment, net	37,770	27,682
Accrued interest receivable	10,898	10,409
Intangible assets, net	8,259	8,806
Bank-owned life insurance	38,142	29,598
Other real estate owned	1,916	1,770
Deferred income taxes	3,078	8,194
Other assets	14,075	14,560
Total assets	1,800,302	1,755,218
Deposits:
Non-interest-bearing demand	214,461	222,359
Interest-bearing checking	618,540	592,673
Savings	102,527	94,559
Certificates of deposit under $100,000	235,395	256,283
Certificates of deposit $100,000 and over	237,619	209,068
Total deposits	1,408,542	1,374,942
Federal funds purchased	17,408	5,482
Securities sold under agreements to repurchase	60,821	61,183
Federal Home Loan Bank borrowings	93,000	106,900
Deferred compensation liability	3,393	3,469
Long-term debt	15,464	15,464
Accrued interest payable	863	765
Other liabilities	8,080	8,997
Total liabilities	1,607,571	1,577,202
Commitments and contingencies (Note 16)
Shareholders' Equity:
Preferred stock, no par value; authorized 500,000 shares; no shares issued and outstanding at December 31, 2014 and December 31, 2013	0	0
Common stock, $1.00 par value; authorized 15,000,000 shares at December 31, 2014 and December 31, 2013; issued 8,690,398 shares at December 31, 2014 and December 31, 2013; outstanding 8,355,666 shares at December 31, 2014 and 8,481,799 shares at December 31, 2013	8,690	8,690
Additional paid-in capital	80,537	80,506
Treasury stock at cost, 334,732 shares as of December 31, 2014 and 208,599 shares at December 31, 2013	-6,945	-3,702
Retained earnings	105,127	91,473
Accumulated other comprehensive income	5,322	1,049
Total shareholders’ equity	192,731	178,016
Total liabilities and shareholders’ equity	$1,800,302	$1,755,218

Consolidated_Balance_Sheets_Pa

Consolidated Balance Sheets Parenthetical Parentheticals (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, except Share data, unless otherwise specified
Statement of Financial Position [Abstract]
Fair value of investment securities held to maturity	$51,253	$30,191
Shareholders' equity:
Preferred stock, par value	$0	$0
Preferred stock, shares authorized	500,000	500,000
Preferred stock, shares issued	0	0
Common stock, par value	$1	$1
Common stock, shares authorized	15,000,000	15,000,000
Common stock, shares issued	8,690,398	8,690,398
Common stock, shares outstanding	8,355,666	8,481,799
Shares of Treasury stock	334,732	208,599

Consolidated_Statements_of_Ope

Consolidated Statements of Operations (USD $)	12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Interest income:
Interest and fees on loans	$48,466	$48,828	$51,355
Interest and discount on loan pool participations	1,516	2,046	1,978
Interest on bank deposits	38	16	54
Interest on federal funds sold	8	1	1
Interest on investment securities:
Taxable securities	8,921	9,905	10,836
Tax-exempt securities	5,455	5,298	5,078
Total interest income	64,404	66,094	69,302
Interest expense:
Interest-bearing checking	2,168	2,362	3,007
Savings	145	140	143
Certificates of deposit under $100,000	2,701	4,239	5,885
Certificates of deposit $100,000 and over	2,013	2,214	2,929
Total interest expense on deposits	7,027	8,955	11,964
Interest on federal funds purchased	8	38	12
Interest on securities sold under agreements to repurchase	119	128	192
Interest on Federal Home Loan Bank borrowings	2,092	2,686	3,094
Interest on other borrowings	24	29	34
Interest on long-term debt	281	296	656
Total interest expense	9,551	12,132	15,952
Net interest income	54,853	53,962	53,350
Provision for loan losses	1,200	1,350	2,379
Net interest income after provision for loan losses	53,653	52,612	50,971
Noninterest income:
Trust, investment, and insurance fees	5,771	5,345	4,995
Service charges and fees on deposit accounts	3,279	2,980	3,247
Mortgage origination and loan servicing fees	1,554	3,209	3,578
Other service charges, commissions and fees	2,381	2,210	2,316
Bank-owned life insurance income	1,102	922	953
Impairment losses on investment securities	0	0	-345
Gain (loss) on sale or call of available for sale securities (Includes $1,227 and $65 reclassified from accumulated other comprehensive income for net gains on available for sale securities for the year ended December 31, 2014 and 2013, respectively)	1,227	65	805
Gain (loss) on sale of premises and equipment	-1	-3	4,188
Total noninterest income	15,313	14,728	19,737
Noninterest expense:
Salaries and employee benefits	24,918	24,596	30,684
Net occupancy and equipment expense	6,293	6,356	6,246
Professional fees	3,606	2,622	2,758
Data processing expense	1,565	1,452	1,679
FDIC Insurance expense	964	1,066	1,224
Amortization of intangible assets	547	663	778
Other operating expense	5,520	5,332	5,591
Total noninterest expense	43,413	42,087	48,960
Income before income tax expense	25,553	25,253	21,748
Income tax expense (Includes $478 and $25 income tax expense reclassified from accumulated other comprehensive income for the year ended December 31, 2014 and 2013, respectively)	7,031	6,646	5,214
Net income	$18,522	$18,607	$16,534
Earnings per share:
Earnings per share, basic	$2.20	$2.19	$1.95
Earnings per share, diluted	$2.19	$2.18	$1.94

Consolidated_Statements_of_Ope1

Consolidated Statements of Operations Parenthetical Parentheticals (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Income Statement [Abstract]
Accumulated other comprehensive income reclassifications for unrealized net gains on available for sale securities	$1,227	$65
Income tax expense from reclassification items	$478	$25

Consolidated_Statements_of_Com

Consolidated Statements of Comprehensive Income (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Net income	$18,522	$18,607	$16,534
Investment securities avalable for sale:
Unrealized holding gains (losses) arising during period	8,114	-15,920	2,681
Reclassification adjustment for gains included in net income	-1,227	-65	-805
Income tax expense (benefit)	2,614	-5,984	706
Other comprehensive income (loss) on available for sale securities	4,273	-10,001	1,170
Defined benefit pension:
Reclassification of pension plan expense due to plan settlement			5,968
Income tax (expense) benefit			-2,226
Other comprehensive income (loss) on defined benefit pension plan	0	0	-3,742
Total other comprehensive income (loss)	4,273	-10,001	4,912
Comprehensive income	$22,795	$8,606	$21,446

Consolidated_Statements_of_Sha

Consolidated Statements of Shareholders' Equity (USD $)	Total	Preferred Stock [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Treasury Stock [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]
In Thousands
Balance at Dec. 31, 2011	$156,494	$0	$8,690	$80,333	($2,312)	$63,645	$6,138
Net income	16,534					16,534
Dividends paid on common stock	-3,054					-3,054
Stock options exercised	577			-16	593
Release/lapse of restriction on RSUs	13			-200	213
Repurchase of common stock	-1,810				-1,810
Stock compensation	266			266
Other comprehensive income (loss), net of tax	4,912						4,912
Balance at Dec. 31, 2012	173,932	0	8,690	80,383	-3,316	77,125	11,050
Net income	18,607					18,607
Dividends paid on common stock	-4,259					-4,259
Stock options exercised	305			9	296
Release/lapse of restriction on RSUs	15			-270	285
Repurchase of common stock	-967				-967
Stock compensation	384			384
Other comprehensive income (loss), net of tax	-10,001						-10,001
Balance at Dec. 31, 2013	178,016	0	8,690	80,506	-3,702	91,473	1,049
Net income	18,522					18,522
Dividends paid on common stock	-4,868					-4,868
Stock options exercised	259			-26	285
Release/lapse of restriction on RSUs	23			-436	459
Repurchase of common stock	-3,987				-3,987
Stock compensation	493			493
Other comprehensive income (loss), net of tax	4,273						4,273
Balance at Dec. 31, 2014	$192,731	$0	$8,690	$80,537	($6,945)	$105,127	$5,322

Consolidated_Statements_of_Sha1

Consolidated Statements of Shareholders' Equity Parenthetical Parentheticals (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Statement of Stockholders' Equity [Abstract]
Dividends paid on common stock (per share)	$0.58	$0.50	$0.36
Stock options exercised (shares)	15,419	56,314	55,986
Release/lapse of restriction on RSUs (shares)	27,491	19,585	15,810
Repurchase of common stock (shares)	165,766	40,713	104,518

Consolidated_Statements_of_Cas

Consolidated Statements of Cash Flows (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Cash flows from operating activities:
Net income	$18,522	$18,607	$16,534
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan losses	1,200	1,350	2,379
Depreciation, amortization and accretion	4,226	5,162	5,422
(Gain) loss on sale of premises and equipment	1	3	-4,188
Deferred income taxes	2,502	-1,454	-54
Stock based compensation	493	384	266
Net gain on sale or call of available for sale securities	-1,227	-65	-805
Net (gain) loss on sale of other real estate owned	-74	115	-196
Net gain on sale of loans held for sale	-507	-1,237	-2,157
Writedown of other real estate owned	66	33	326
Other-than-temporary impairment of investment securities	0	0	345
Origination of loans held for sale	42,410	82,282	152,389
Proceeds from sales of loans held for sale	42,473	84,357	155,306
Recognition of previously deferred expense related to pension plan settlement			3,002
Pension plan contribution			-3,031
(Increase) decrease in accrued interest receivable	-489	-117	130
Increase in cash value of bank-owned life insurance	-1,102	-922	-953
Decrease in other assets	485	5,822	1,280
Decrease in deferred compensation liability	-76	-86	-88
(Decrease) increase in accounts payable, accrued expenses, and other liabilities	-819	-1,410	1,409
Net cash provided by operating activities	23,264	28,260	22,538
Cash flows from investing activities
Proceeds from sales of available for sale investment securities	33,457	12,447	18,307
Proceeds from maturities and calls of available for sale securities	64,669	103,200	130,432
Purchase of available for sale investment securities	-67,892	-74,582	-172,060
Proceeds from maturities and calls of held to maturity securities	1,147	1,232	722
Purchases of held to maturity securities	-20,052	-1,185	-31,348
Increase in loans	-45,911	-54,477	-53,560
Decrease in loan pool participations, net	6,201	10,117	14,402
Purchase of premises and equipment, net	-12,320	-4,521	-3,518
Proceeds from sale of other real estate owned	650	1,581	2,976
Proceeds from sales of premises and equipment	57	18	5,244
Proceeds from sale of assets held for sale		764
Proceeds of principal and earnings from bank-owned life insurance	488
Purchases of bank-owned life insurance	-7,930
Net cash used in investing activities	-47,436	-5,406	-88,403
Cash flows from financing activities:
Net increase (decrease) in deposits	33,600	-24,791	93,091
Net increase (decrease) in federal funds purchased	11,926	5,482	-8,920
Net (decrease) increase in securities sold under agreements to repurchase	-362	-7,640	20,536
Proceeds from Federal Home Loan Bank borrowings	26,000	166,000	20,000
Repayment of Federal Home Loan Bank borrowings	-39,900	-179,300	-40,000
Stock options exercised	282	320	590
Dividends paid	-4,868	-4,259	-3,054
Repurchase of common stock	-3,987	-967	-1,810
Net cash (used in) provided by financing activities	22,691	-45,155	80,433
Net (decrease) increase in cash and cash equivalents	-1,481	-22,301	14,568
Cash and cash equivalents:
Cash and cash equivalents at beginning of period	24,890	47,191	32,623
Cash and cash equivalents at end of period	23,409	24,890	47,191
Supplemental disclosures of cash flow information:
Cash payments for interest paid on deposits and borrowings	9,453	12,842	16,007
Cash payments for income taxes	4,144	7,961	5,169
Transfer of loans to other real estate owned	788	221	2,351
Transfer of property to assets held for sale			$764

Principles_of_Consolidation_an

Principles of Consolidation and Presentation	12 Months Ended
	Dec. 31, 2014
Principles of Consolidation and Presentation [Abstract]
Organization, Consolidation, Basis of Presentation, Business Description and Accounting Policies [Text Block]	Nature of Business and Significant Accounting Policies
	Nature of business: The Company is a bank holding company registered under the Bank Holding Company Act of 1956 that has elected to be a financial holding company. It is headquartered in Iowa City, Iowa and owns 100% of the outstanding common stock of MidWestOne Bank, Iowa City, and 100% of the common stock of MidWestOne Insurance Services, Inc., Oskaloosa, Iowa. MidWestOne Bank (“MidWestOne Bank” or the “Bank”) is also headquartered in Iowa City, Iowa, and provides services to individuals, businesses, governmental units and institutional customers in central and east-central Iowa. The Bank has office locations in Belle Plaine, Burlington, Cedar Falls, Conrad, Coralville, Davenport, Fairfield, Fort Madison, Melbourne, North English, North Liberty, Oskaloosa, Ottumwa, Parkersburg, Pella, Sigourney, Waterloo and West Liberty, Iowa. MidWestOne Insurance Services, Inc. provides personal and business insurance services in Cedar Falls, Conrad, Melbourne, Oskaloosa, Parkersburg, and Pella, Iowa. The Bank is actively engaged in many areas of commercial banking, including: acceptance of demand, savings and time deposits; making commercial, real estate, agricultural and consumer loans, and other banking services tailored for its individual customers. The Wealth Management area of the Bank administers estates, personal trusts, conservatorships, and pension and profit-sharing accounts along with providing other management services to customers.
	On November 20, 2014, the Company entered into merger agreement with Central Bancshares, Inc. ("Central"), a Minnesota corporation, pursuant to which Central will merge with and into the Company. In connection with the merger, Central Bank, a Minnesota-chartered commercial bank and wholly-owned subsidiary of Central, will become a wholly-owned subsidiary of the Company. The merger agreement also provides that each of the outstanding shares of Central common stock will be converted into the right for each Central shareholder to receive its pro rata share of 2,723,083 shares of Company common stock and $64.0 million in cash. The corporate headquarters of the combined company will be Iowa City, Iowa. The merger is anticipated to be completed in the second quarter of 2015. (See Note 20. “Proposed Merger” for additional information.)
	Accounting estimates: The preparation of financial statements in conformity with U.S. Generally Accepted Accounting Principles (“GAAP”) requires management to make estimates and assumptions that affect the reported amount of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. The U.S. economic environment in recent years has increased the degree of uncertainty inherent in these estimates.
	Certain significant estimates: The allowance for loan losses and the fair values of investment securities and other financial instruments involve certain significant estimates made by management. These estimates are reviewed by management routinely and it is reasonably possible that circumstances that exist may change in the near-term future and that the effect could be material to the consolidated financial statements.
	Principles of consolidation: The consolidated financial statements include the accounts of MidWestOne Financial Group, Inc., a bank holding company, and its wholly-owned subsidiaries which include MidWestOne Bank, a state chartered bank whose primary federal regulator is the Federal Deposit Insurance Corporation, and MidWestOne Insurance Services, Inc. All significant inter-company accounts and transactions have been eliminated in consolidation.
	Trust assets, other than cash deposits held by the Bank in a fiduciary or agency capacity for its customers, are not included in the accompanying consolidated financial statements because such accounts are not assets of the Bank.
	In the normal course of business, the Company may enter into a transaction with a variable interest entity (“VIE”). VIEs are legal entities whose investors lack the ability to make decisions about the entity’s activities, or whose equity investors do not have the right to receive the residual returns of the entity. The applicable accounting guidance requires the Company to perform ongoing quantitative and qualitative analysis to determine whether it must consolidate any VIE. The Company does not have any ownership interest in or exert any control over any VIE, and thus no VIEs are included in the consolidated financial statements. Investments in non-marketable loan participation certificates for which the Company does not have the ability to exert significant influence are accounted for using the cost method.
	Presentation of cash flows: For purposes of reporting cash flows, cash and due from banks includes cash on hand, amounts due from banks, and federal funds sold. Cash flows from portfolio loans originated by the Bank, deposits, federal funds purchased, and securities sold under agreements to repurchase are reported net.
	Cash receipts and cash payments resulting from acquisitions and sales of loans originated for sale are classified as operating cash flows on a gross basis in the consolidated statements of cash flows.
	Investment securities: Certain debt securities that the Company has the positive intent and ability to hold to maturity are classified as held to maturity and recorded at amortized cost. Securities not classified as held to maturity, including equity securities with readily determinable fair values, are classified as available for sale and recorded at fair value, with unrealized gains and losses excluded from earnings and reported in other comprehensive income.
	The Company carries its investment securities at fair value, and the Company employs valuation techniques which utilize observable inputs when those inputs are available. These observable inputs reflect assumptions market participants would use in pricing the security, developed based on market data obtained from sources independent of the Company. When such information is not available, the Company employs valuation techniques which utilize unobservable inputs, or those which reflect the Company’s own assumptions about assumptions that market participants would use, based on the best information available in the circumstances. These valuation methods typically involve cash flow and other financial modeling techniques. Changes in underlying factors, assumptions, estimates, or other inputs to the valuation techniques could have a material impact on the Company’s future financial condition and results of operations. Fair value measurements are required to be classified as Level 1 (quoted prices), Level 2 (based on observable inputs) or Level 3 (based on unobservable inputs) discussed in more detail in Note 18 to the consolidated financial statements. Available for sale securities are recorded at fair value with unrealized gains and losses excluded from earnings and reported as a separate component of shareholders’ equity until realized.
	Purchase premiums and discounts are recognized in interest income using the interest method over the terms of the securities. Declines in the fair value of held to maturity and available for sale securities below their cost that are deemed to be other than temporary are reflected in earnings as realized losses. In determining whether other than temporary impairment exists, management considers whether: (1) we have the intent to sell the security; (2) it is more likely than not that we will be required to sell the security before recovery of the amortized cost basis; and (3) we do not expect to recover the entire amortized cost basis of the security. Gains and losses on the sale of securities are recorded on the trade date and are determined using the specific identification method.
	Loans: Loans are stated at the principal amount outstanding, net of deferred loan fees and costs and allowance for loan losses. Interest on loans is credited to income as earned based on the principal amount outstanding. Deferred loan fees and costs are amortized using the level yield method over the remaining maturities on the loans.
	The accrual of interest on mortgage and commercial loans is discontinued at the time the loan is 90 days past due, unless the credit is well secured and in process of collection. Credit card loans and other personal loans are typically charged off no later than 180 days past due. Past due status is based on contractual terms of the loan. In all cases, loans are placed on nonaccrual or charged off at an earlier date, if collection of principal or interest is considered doubtful.
	All interest accrued but not collected for loans that are placed on nonaccrual or charged off is reversed against interest income. The interest on these loans is accounted for on the cash-basis or cost-recovery method, until qualifying for return to accrual. Loans are returned to accrual status when all the principal and interest amounts contractually due are brought current and future payments are reasonably assured.
	Loan Pool Participations: The Company acquired its loan pool participations from the Former MidwestOne during the merger and continued in this business following the merger. However, in 2010, the Company made the decision to exit this line of business and is thus not purchasing new loan pool participations as existing pools pay down. The pools consist of loans to borrowers located throughout the United States.
	The Company carries its investment in the loan pools as a separate earning asset on the consolidated balance sheets. Principal or interest restructures, write-downs, or write-offs within the pools are not included in the Company’s disclosures for its loan portfolio, and foreclosed property from loans associated with the pools is not included in other real estate owned on the consolidated balance sheets. The loan pool participations are managed by a non-affiliate servicer operating in Omaha, Nebraska.
	Each pool has a different composition and different characteristics. The composition of a loan pool is generally determined by the seller based on its desire to maximize the price it receives for all loans among the various pools. Many of the pools consist of loans primarily secured by single-family, multi-family, and small commercial real estate. Some pools may consist of a large number of small consumer loans that are secured by other assets such as automobiles or mobile homes, while other pools may consist of small- to medium-balance commercial loans. Some may contain a mixture of such loans and other types of loans.
	The Company invested in pools consisting of both performing loans and past-due nonperforming loans. The price bid and paid for such a loan pool was determined based on the composition of the particular pool, the amounts the servicer believed could be collected on such a pool, and the risks associated with the collection of such amounts.
	Upon the acquisition of a participation interest in a loan pool, the Company assumed the risk of loss on a pro-rata basis. The extent of such risk is dependent on a number of factors, including the servicer’s ability to locate the debtors, the debtors’ financial condition, the possibility that a debtor may file for protection under applicable bankruptcy laws, the servicer’s ability to locate the collateral, if any, for the loan and to obtain possession of such collateral, the value of such collateral, and the length of time it takes to realize the ultimate recovery either through collection procedures or through a resale of the loans following a restructure.
	A cost “basis” was assigned to each individual loan acquired on a cents-per-dollar (discounted price) basis based on the servicer’s assessment of the recovery potential of each such loan. This methodology assigns a higher basis to performing loans with greater potential collectability and a lower basis to those loans identified as having little or no potential for collection.
	Loan pool participations are shown on the Company’s consolidated balance sheets as a separate asset category. The original carrying value of loan pool participations represents the discounted price paid by the Company to acquire its participation interests in various loan pools purchased by the servicer. The Company’s investment balance is reduced as the servicer collects principal payments on the loans and remits the proportionate share of such payments to the Company, as well as for charge-offs of amounts determined to be uncollectible.
	The loan pool participations acquired are accounted for in accordance with the provisions of ASC Topic 310.
	ASC Topic 310 provides guidance on the accounting for purchased loans that show evidence of deterioration of credit quality since origination and for which it is probable, at acquisition, that the purchaser will be unable to collect all contractually required payments receivable. ASC Topic 310 generally requires that the excess of the estimated cash flows expected to be collected on the loan over the initial investment be accreted over the estimated remaining life of the loan.
	According to ASC Topic 310, in order to apply the interest method of recognition to these types of loans, there must be sufficient information to reasonably estimate the amount and timing of the cash flows expected to be collected. When that is not the case, the loan should be accounted for as a nonaccrual status applying the cash basis income recognition to the loan.
	The Company developed and implemented procedures to determine if accretion of the discount (“accretable yield”) on the purchased loans in a pool is required under ASC Topic 310. Given the impaired nature of the loan pools typically purchased, the individual loans were evaluated for ASC Topic 310 purposes by the end of a six-month window from the date of purchase. This provided time to assess the quality of the loans and assign basis to each loan within the pool. Purchased loans were evaluated individually with a determination made utilizing various criteria including: past-due status, late payments, legal status of the loan (not in foreclosure, judgment against the borrower, or referred to legal counsel), frequency of payments made, collateral adequacy and the borrower’s financial condition. If all the criteria were met, the Company utilized the accounting treatment for that individual loan required by ASC Topic 310 with the accretable yield difference between the expected cash flows and the purchased basis accreted into income on the level yield basis over the anticipated life of the loan. If any of the six criteria were not met, the loan is accounted for on the cash-basis of accounting.
	In the event that a prepayment is received on a loan accounted for under ASC Topic 310, the accretable yield is recomputed and the revised amount accreted over the estimated remaining life of the loan on the level yield basis. If a loan subject to accretable yield under ASC Topic 310 fails to make timely payments, it is subject to classification and an allowance for loss would be established.
	Collection expenses incurred by the servicer are netted against discount income. Discount income is added to interest income and reflected as one amount on the Company’s consolidated statements of operations.
	Interest income is only recognized when collected and actually remitted to the Company by the servicer for those loans subject to nonaccrual status in accordance with ASC Topic 310. Many of the pools that have been purchased by the servicer do not include purchased interest in the cost basis; thus, interest collected does not have a cost basis and represents profit. Interest income collected by the servicer is reflected in the Company’s consolidated financial statements as interest income and is included as part of interest and discount on loan pool participations.
	Loans held for sale: Loans originated and intended for sale in the secondary market are carried at the lower of aggregate cost or estimated fair value, as determined by aggregate outstanding commitments from investors or current investor yield requirements. Net unrealized losses, if any, are recognized through a valuation allowance by charges to income.
	Mortgage loans held for sale are generally sold with the mortgage servicing rights retained. Gains or losses on sales of mortgage loans are recognized based on the difference between the selling price plus the value of servicing rights, less the carrying value of the related mortgage loans sold.
	Allowance for loan losses: The allowance for loan losses is established as losses estimated to have been incurred through a provision for loan losses charged to earnings. Loan losses are charged against the allowance when management believes the uncollectibility of a loan balance is confirmed. Subsequent recoveries, if any, are credited to the allowance.
	The allowance for loan losses is evaluated on a quarterly basis by management and is based upon management’s periodic review of the collectiblity of the loans in light of historical experience, the nature and volume of the loan portfolio, adverse situations that may affect the borrower’s ability to repay, estimated value of any underlying collateral and prevailing economic conditions. This evaluation is inherently subjective, as it requires estimates that are susceptible to significant revision as more information becomes available.
	The allowance consists of specific, general and unallocated components. The specific component relates to loans that are classified as doubtful, substandard or special mention. For such loans that are also classified as impaired as well as any loan (regardless of classification) meeting the definition of a troubled debt restructuring, an allowance is established when the discounted cash flows (or collateral value or observable market price) of the impaired loan are lower than the carrying value of that loan. The general component covers loans not classified as impaired and is based on historical loss experience adjusted for qualitative factors. An unallocated component is maintained to cover uncertainties that could affect management’s estimate of probable losses. The unallocated component of the allowance reflects that margin of imprecision inherent in the underlying assumptions used in the methodologies for estimating specific and general losses in the portfolio.
	A loan is considered impaired when, based on current information and events, it is probable that the Bank will be unable to collect the scheduled payments of principal or interest when due according to the contractual terms of the loan agreement. Factors considered by management in determining impairment include: payment status, collateral value and the probability of collecting scheduled principal and interest payments when due. Loans that experience insignificant payment delays and payment shortfalls generally are not classified as impaired. Management determines the significance of payment delays and payment shortfalls on a case-by-case basis, taking into consideration all of the circumstances surrounding the loan and the borrower, including the length of the delay, the reasons for the delay, the borrower’s prior payment record and the amount of the shortfall in relation to the principal and interest owed. Impairment is measured on a loan-by-loan basis by either the present value of expected future cash flows discounted at the loan’s effective interest rate, the loan’s observable market price or the fair value of the collateral, if the loan is collateral dependent.
	Large groups of smaller-balance, homogeneous loans are collectively evaluated for impairment. Accordingly, the Bank generally does not separately identify individual consumer and residential loans for impairment unless they meet the definition of a troubled debt restructure.
	Transfers of financial assets: Revenue from the origination and sale of loans in the secondary market is recognized upon the transfer of financial assets and accounted for as sales when control over the assets has been surrendered. The Bank also sells participation interests in some large loans originated, to non-affiliated entities. Control over transferred assets is deemed to be surrendered when: (1) the assets have been isolated from the Bank and its affiliates; (2) the transferee has the right to pledge or exchange the assets it received and no condition both constrains the transferee from taking advantage of its right to pledge or exchange and provides more than a trivial benefit to the transferor; and (3) the Bank and its affiliates do not maintain effective control over the transferred assets through an agreement to repurchase them before their maturity or the ability to unilaterally cause the holder to return specific assets.
	Revenue recognition: Trust fees, deposit account service charges and other fees are recognized when payment is received for the services (cash basis), which generally occurs at the time the services are provided.
	Credit-related financial instruments: In the ordinary course of business, the Bank has entered into commitments to extend credit, including commitments under credit card arrangements, commercial letters of credit and standby letters of credit. Such financial instruments are recorded when they are funded. The Bank records a liability to the extent losses on its commitments to lend are probable.
	Premises and equipment: Land is carried at cost. Premises and equipment are stated at cost less accumulated depreciation. The estimated useful lives and primary method of depreciation for the principal items are as follows:
		Years
	Type of Assets	Minimum		Maximum	Depreciation Method
	Buildings and leasehold improvements	10	-	30	Straight-line
	Furniture and equipment	3	-	10	Straight-line
	Charges for maintenance and repairs are expensed as incurred. When assets are retired or disposed of the related cost and accumulated depreciation are removed from the respective accounts and the resulting gain or loss is recorded.
	Other real estate owned: Real estate properties acquired through or in lieu of foreclosure are initially recorded at fair value less estimated selling cost at the date of foreclosure, establishing a new cost basis. Fair value is determined by management by obtaining appraisals or other market value information at least annually. Any write-downs in value at the date of acquisition are charged to the allowance for loan losses. After foreclosure, valuations are periodically performed by management by obtaining updated appraisals or other market value information. Any subsequent write-downs are recorded as a charge to operations, if necessary, to reduce the carrying value of a property to the updated fair value less estimated selling cost. Net costs related to the holding of properties are included in noninterest expense.
	Mortgage servicing rights: Mortgage servicing rights are recorded at fair value based on assumptions through a third-party valuation service. The valuation model incorporates assumptions that market participants would use in estimating future net servicing income, such as the servicing cost per loan, the discount rate, the escrow float rate, an inflation rate, ancillary income, prepayment speeds and default rates and losses.
	Bank-owned life insurance: Bank-owned life insurance is carried at cash surrender value, net of surrender and other charges, with increases/decreases reflected as income/expense in the consolidated statements of operations.
	Employee benefit plans: Deferred benefits under a salary continuation plan are charged to expense during the period in which the participating employees attain full eligibility.
	Stock-based compensation: Compensation expense for share based awards is recorded over the vesting period at the fair value of the award at the time of grant. The exercise price of options or fair value of nonvested shares granted under the Company’s incentive plans is equal to the fair market value of the underlying stock at the grant date. The Company assumes no projected forfeitures on its stock based compensation, since actual historical forfeiture rates on its stock-based incentive awards has been negligible.
	Income taxes: The Company files a consolidated federal income tax return. Income tax expense is generally allocated as if the Company and its subsidiaries file separate income tax returns. For state purposes, the Bank files a franchise tax return and the remaining entities file a consolidated income tax return. Deferred tax assets and liabilities are recognized for the future tax consequences attributable to temporary differences between the financial statement carrying amount of existing assets and liabilities and their respective tax bases. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be recovered or settled. The effect of a change in tax rates on deferred tax assets and liabilities is recognized in income in the period that includes the enactment date. Deferred tax assets are reduced by a valuation allowance when, in the opinion of management, it is more likely than not that some portion or all of the deferred tax assets will not be realized.
	In accordance with ASC 740, Income Taxes, the Company recognizes a tax position as a benefit only if it is more likely than not that the tax position would be sustained in a tax examination, with a tax examination being presumed to occur. The amount recognized is the largest amount of tax benefit that is greater than 50% likely of being realized upon examination. For tax positions not meeting the more likely than not test, no tax benefit is recorded. The Company recognizes interest and/or penalties related to income tax matters in income tax expense.
	There were no material unrecognized tax benefits or any interest or penalties on any unrecognized tax benefits as of December 31, 2014 and 2013.
	Common stock: On October 18, 2011, our Board of Directors amended the Company’s then existing share repurchase program by increasing the remaining amount of authorized repurchases to $5.0 million, and extending the expiration of the program to December 31, 2012. We repurchased 57,151 shares of common stock during the fourth quarter of 2011 for an aggregate cost of $840,000. In 2012, we repurchased a total of 104,518 shares of common stock at a cost of $1.8 million.
	On January 15, 2013, the Company's board of directors announced the renewal of the Company's share repurchase program, extending the expiration of the program to December 31, 2014 and increasing the remaining amount of authorized repurchases under the program to $5.0 million from the approximately $2.4 million of authorized repurchases that had previously remained. Pursuant to the program, the Company may continue to repurchase shares from time to time in the open market, and the method, timing and amounts of repurchase will be solely in the discretion of the Company's management. The repurchase program does not require the Company to acquire a specific number of shares. Therefore, the amount of shares repurchased pursuant to the program will depend on several factors, including market conditions, capital and liquidity requirements, and alternative uses for cash available. In 2013, we repurchased 40,713 shares of common stock at a cost of $1.0 million.
	On July 17, 2014, the board of directors of the Company approved a new share repurchase program, allowing for the repurchase of up to $5.0 million of stock through December 31, 2016. The new repurchase program replaced the Company's prior repurchase program, pursuant to which the Company had repurchased approximately $3.7 million of common stock since January 1, 2013. Pursuant to the new program, the Company may continue to repurchase shares from time to time in the open market, and the method, timing and amounts of repurchase will be solely in the discretion of the Company's management. The repurchase program does not require the Company to acquire a specific number of shares. Therefore, the amount of shares repurchased pursuant to the program will depend on several factors, including market conditions, capital and liquidity requirements, and alternative uses for cash available. Of the $5.0 million of stock authorized under the repurchase plan, $3.8 million remained available for possible future repurchases as of December 31, 2014. In 2014, we repurchased 165,766 shares of common stock at a cost of $4.0 million .
	In addition, as part of the agreement with Central, the Company will issue 2,723,083 shares of Company common stock to Central’s shareholders upon consummation of the transaction, which is expected to occur in the second quarter of 2015.
	Comprehensive income: Accounting principles generally require that recognized revenue, expenses, gains and losses be included in net income. Certain changes in assets and liabilities, such as unrealized gains and losses on available-for-sale securities, are reported as a separate component of shareholders’ equity on the consolidated balance sheets, and are disclosed in the consolidated statements of comprehensive income.
	The components of accumulated other comprehensive income, included in shareholders’ equity, net of tax, are as follows:
			Year Ended December 31,
			2014			2013		2012
	(in thousands)
	Unrealized gains on securities available for sale, net of tax		$	5,322		$	1,049	$	11,050
Accumulated other comprehensive income, net of tax		$	5,322		$	1,049	$	11,050
Recent Accounting Pronouncements
In July 2013, the FASB issued Accounting Standards Update No. 2013-11, Income Taxes (Topic 740): Presentation of an Unrecognized Tax Benefit When a Net Operating Loss Carryforward, a Similar Tax Loss, or a Tax Credit Carryforward Exists. The objective of this update is to eliminate the diversity in practice on the financial statement presentation of an unrecognized tax benefit when a net operating loss carryforward, a similar tax loss, or a tax credit carryforward exists. For public entities, the amendments became effective for fiscal years, and interim periods within those years, beginning after December 15, 2013, with early adoption permitted. The adoption of this amendment did not have a material effect on the Company’s consolidated financial statements.
In January 2014, the FASB issued Accounting Standards Update No. 2014-01, Investments—Equity Method and Joint Ventures (Topic 323): Accounting for Investments in Qualified Affordable Housing Projects. The objective of this update is to provide guidance on accounting for investments by a reporting entity in flow-through limited liability entities that manage or invest in affordable housing projects that qualify for the low-income housing tax credit. The low-income housing tax credit program is designed to encourage private capital investment in the construction and rehabilitation of low-income housing. This program is an indirect tax subsidy that allows investors in a flow-through limited liability entity, such as limited partnerships or limited liability companies that manage or invest in qualified affordable housing projects, to receive the benefits of the tax credits allocated to the entity that owns the qualified affordable housing project. The tax credits are allowable on the tax return each year over a 10-year period as a result of a sufficient number of units being rented to qualifying tenants and are subject to restrictions on gross rentals paid by those tenants. Those credits are subject to recapture over a 15-year period starting with the first year tax credits are earned. The amendments in this update permit reporting entities to make an accounting policy election to account for their investments in qualified affordable housing projects using the proportional amortization method if certain conditions are met. For public entities, the amendments are to be applied retrospectively to all annual periods and interim reporting periods presented within those annual periods, beginning after December 15, 2014. The adoption of this amendment is not expected to have a material effect on the Company’s consolidated financial statements.
In January 2014, the FASB issued Accounting Standards Update No. 2014-04, Receivables—Troubled Debt Restructurings by Creditors (Subtopic 310-40): Reclassification of Residential Real Estate Collateralized Consumer Mortgage Loans upon Foreclosure. The objective of this update is to reduce diversity by clarifying when an in-substance repossession or foreclosure occurs, that is, when a creditor should be considered to have received physical possession of residential real estate property collateralizing a consumer mortgage loan such that the loan receivable should be derecognized and the real estate property recognized. For public entities, the amendments are effective for reporting periods beginning after December 31, 2014, with early adoption permitted. The adoption of this amendment is not expected to have a material effect on the Company’s consolidated financial statements.
In May 2014, the FASB issued Accounting Standards Update No. 2014-09, Revenue from Contract with Customers (Topic 606). The guidance in this update affects any entity that either enters into contracts with customers to transfer goods or services or enters into contracts for the transfer of nonfinancial assets unless those contracts are within the scope of other standards (for example, insurance contracts or lease contracts). The core principle of the guidance is that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. To achieve that core principle, an entity should apply the following five steps: 1) identify the contracts(s) with the customer; 2) identify the performance obligations in the contract; 3) determine the transaction price; 4) allocate the transaction price to the performance obligations in the contract; and 5) recognize revenue when (or as) the entity satisfies a performance obligation. The guidance also specifies the accounting for some costs to obtain or fulfill a contract with a customer. For a public entity, the amendments in this update are effective for annual reporting periods beginning after December 15, 2016, including interim periods within that reporting period. Early application is not permitted. The Company is still evaluating the effect of this amendment on the Company’s consolidated financial statements.
In June 2014, the FASB issued Accounting Standards Update No. 2014-11, Transfers and Servicing (Topic 860): Repurchase-to-Maturity Transactions, Repurchase Financings, and Disclosures. The guidance in this update changes the accounting for repurchase-to-maturity transactions and repurchase financing arrangements. It also requires enhanced disclosures about repurchase agreements and other similar transactions. The accounting changes in this update are effective for public companies for the first interim or annual period beginning after December 15, 2014. In addition, for public companies, the disclosure for certain transactions accounted for as a sale is effective for the first interim or annual period beginning on or after December 15, 2014, and the disclosure for transactions accounted for as secured borrowings is required to be presented for annual periods beginning after December 15, 2014, and interim periods beginning after March 15, 2015. Early application is not permitted. The adoption of this amendment is not expected to have a material effect on the Company’s consolidated financial statements.
In August 2014, the FASB issued Accounting Standards Update No. 2014-14, Receivables - Troubled Debt Restructurings by Creditors (Subtopic 310-40): Classification of Certain Government-Guaranteed Mortgage Loans upon Foreclosure. This update provides guidance on how to classify and measure certain government-guaranteed mortgage loans upon foreclosure, most commonly those offered by the Federal Housing Administration (FHA) of the U.S. Department of Housing and Urban Development (HUD), and the U.S. Department of Veterans Affairs (VA). The ASU requires that a mortgage loan be derecognized and that a separate other receivable be recognized upon foreclosure if the following conditions are met: 1) the loan has a government guarantee that is not separable from the loan before foreclosure; 2) at the time of foreclosure, the creditor has the intent to convey the real estate property to the guarantor and make a claim on the guarantee, and the creditor has the ability to recover under the claim; and 3) at the time of foreclosure, an amount of the claim that is determined on the basis of the fair value of the real estate is fixed. Upon foreclosure, the separate other receivable should be measured based on the amount of the loan balance (principal and interest) expected to be recovered from the guarantor. The accounting changes in this update are effective for public companies for annual periods, and the interim periods within those annual periods, beginning after December 15, 2014. Early application is permitted under certain circumstances. The adoption of this amendment is not expected to have a material effect on the Company’s consolidated financial statements.
In August 2014, the FASB issued Accounting Standards Update No. 2014-15, Presentation of Financial Statements - Going Concern (Subtopic 205-40): Disclosure of Uncertainties about an Entity's Ability to Continue as a Going Concern. The amendments in this update provide guidance in GAAP about management's responsibility to evaluate whether there is substantial doubt about an entity's ability to continue as a going concern and to provide related footnote disclosures. In doing so, the amendment should reduce diversity in the timing and content of footnote disclosures. Disclosures are required if it is probable an entity will be unable to meet its obligations within the look-forward period of twelve months after the financial statements are made available. Incremental substantial doubt disclosure is required if the probability is not mitigated by management's plans. The new standard applies to all entities for the first annual period ending after December 15, 2016, and interim periods thereafter. The adoption of this standard is not expected to have a material effect on the Company’s consolidated financial statements.
In November 2014, the FASB issued Accounting Standards Update No. 2014-17, Business Combinations (Topic 805): Pushdown Accounting. The amendments in this update provide an acquired entity with an option to apply pushdown accounting in its separate financial statements upon occurrence of an event in which an acquirer obtains control of the acquired entity. An acquired entity may elect the option to apply pushdown accounting in the reporting period in which the change-in-control event occurs. If pushdown accounting is not applied in the reporting period in which the change-in-control event occurs, an acquired entity will have the option to elect to apply pushdown accounting in a subsequent reporting period to the acquired entity’s most recent change-in-control event. If pushdown accounting is applied to an individual change-in-control event, that election is irrevocable. The amendments in this Update are effective on November 18, 2014. After the effective date, an acquired entity can make an election to apply the guidance to future change-in-control events or to its most recent change-in-control event. The adoption of this standard did not have a material effect on the Company’s consolidated financial statements.

Investment_Securities

Investment Securities	12 Months Ended
	Dec. 31, 2014
Investment Securities [Abstract]
Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block]	Investment Securities
	The amortized cost and fair value of investment securities available for sale, with gross unrealized gains and losses, are as follows:
						Gross				Gross
		Amortized				Unrealized				Unrealized				Estimated
		Cost				Gains				Losses				Fair Value
	(in thousands)
	December 31, 2014
	U.S. Government agencies and corporations	$	49,392			$	248			$	265			$	49,375
	State and political subdivisions	187,276				8,113				190				195,199
	Mortgage-backed securities	30,965				1,498				—				32,463
	Collateralized mortgage obligations	147,412				813				2,093				146,132
	Collateralized debt obligations	—				—				—				—
	Corporate debt securities	48,656				188				103				48,741
	Total debt securities	463,701				10,860				2,651				471,910
	Other equity securities	2,686				380				34				3,032
	Total investment securities	$	466,387			$	11,240			$	2,685			$	474,942
	December 31, 2013
	U.S. Government agencies and corporations	$	45,279			$	527			$	867			$	44,939
	State and political subdivisions	207,734				5,625				2,563				210,796
	Mortgage-backed securities	37,593				1,692				—				39,285
	Collateralized mortgage obligations	171,714				1,003				3,494				169,223
	Collateralized debt obligations	2,111				190				984				1,317
	Corporate debt securities	29,802				284				142				29,944
	Total debt securities	494,233				9,321				8,050				495,504
	Other equity securities	2,659				453				55				3,057
	Total investment securities	$	496,892			$	9,774			$	8,105			$	498,561
	The amortized cost and fair value of investment securities held to maturity, with gross unrealized gains and losses, are as follows:
						Gross				Gross
		Amortized				Unrealized				Unrealized				Estimated
		Cost				Gains				Losses				Fair Value
	(in thousands)
	December 31, 2014
	State and political subdivisions	$	39,704			$	370			$	252			$	39,822
	Mortgage-backed securities	22				3				—				25
	Collateralized mortgage obligations	8,531				—				233				8,298
	Corporate debt securities	3,267				—				159				3,108
	Total	$	51,524			$	373			$	644			$	51,253
	December 31, 2013
	State and political subdivisions	$	19,888			$	—			$	1,326			$	18,562
	Mortgage-backed securities	28				3				—				31
	Collateralized mortgage obligations	9,447				—				834				8,613
	Corporate debt securities	3,262				—				277				2,985
	Total	$	32,625			$	3			$	2,437			$	30,191
	Investment securities with a market value of $200.7 million and $202.8 million at December 31, 2014 and 2013, respectively, were pledged on public deposits, securities sold under agreements to repurchase and for other purposes, as required or permitted by law.
	The summary of investment securities shows that some of the securities in the available for sale and held to maturity investment portfolios had unrealized losses, or were temporarily impaired, as of December 31, 2014 and December 31, 2013. This temporary impairment represents the estimated amount of loss that would be realized if the securities were sold on the valuation date.
	The following presents information pertaining to securities with gross unrealized losses as of December 31, 2014 and 2013, aggregated by investment category and length of time that individual securities have been in a continuous loss position:
					As of December 31, 2014
		Number			Less than 12 Months								12 Months or More					Total
		of
	Available for Sale	Securities			Estimated				Unrealized				Estimated			Unrealized		Estimated		Unrealized
					Fair				Losses				Fair			Losses		Fair		Losses
					Value								Value					Value
	(in thousands, except number of securities)
	U.S. Government agencies and corporations	4			$	9,946			$	11			$	15,018		$	254	$	24,964	$	265
	State and political subdivisions	46			3,024				18				10,728			172		13,752		190
	Collateralized mortgage obligations	14			14,971				123				68,370			1,970		83,341		2,093
	Corporate debt securities	7			23,024				50				3,400			53		26,424		103
	Other equity securities	1			—				—				966			34		966		34
	Total	72			$	50,965			$	202			$	98,482		$	2,483	$	149,447	$	2,685
					As of December 31, 2013
		Number			Less than 12 Months								12 Months or More					Total
		of
		Securities			Estimated				Unrealized				Estimated			Unrealized		Estimated		Unrealized
					Fair				Losses				Fair			Losses		Fair		Losses
		Value							Value						Value
(in thousands, except number of securities)
U.S. Government agencies and corporations	3			$	21,977			$	867			$	—		$	—	$	21,977	$	867
State and political subdivisions	171			54,153				2,331				1,799			232		55,952		2,563
Collateralized mortgage obligations	18			110,142				3,164				5,047			330		115,189		3,494
Collateralized debt obligations	3			—				—				934			984		934		984
Corporate debt securities	3			7,430				93				1,561			49		8,991		142
Other equity securities	1			945				55				—			—		945		55
Total	199			$	194,647			$	6,510			$	9,341		$	1,595	$	203,988	$	8,105
				As of December 31, 2014
	Number			Less than 12 Months								12 Months or More					Total
	of
Held to Maturity	Securities			Estimated				Unrealized				Estimated			Unrealized		Estimated		Unrealized
				Fair				Losses				Fair			Losses		Fair		Losses
				Value								Value					Value
(in thousands, except number of securities)
State and political subdivisions	29			$	5,322			$	190			$	9,144		$	62	$	14,466	$	252
Collateralized mortgage obligations	1			—				—				8,298			233		8,298		233
Corporate debt securities	2			2,358				27				750			132		3,108		159
Total	32			$	7,680			$	217			$	18,192		$	427	$	25,872	$	644
				As of December 31, 2013
	Number			Less than 12 Months								12 Months or More					Total
	of
	Securities			Estimated				Unrealized				Estimated			Unrealized		Estimated		Unrealized
				Fair				Losses				Fair			Losses		Fair		Losses
				Value								Value					Value
(in thousands, except number of securities)
State and political subdivisions	30			$	17,420			$	1,195			$	1,142		$	131	$	18,562	$	1,326
Collateralized mortgage obligations	1			8,613				834				—			—		8,613		834
Corporate debt securities	2			2,984				277				—			—		2,984		277
Total	33			$	29,017			$	2,306			$	1,142		$	131	$	30,159	$	2,437
The Company's assessment of other-than-temporary impairment ("OTTI") is based on its reasonable judgment of the specific facts and circumstances impacting each individual security at the time such assessments are made. The Company reviews and considers factual information, including expected cash flows, the structure of the security, the creditworthiness of the issuer, the type of underlying assets and the current and anticipated market conditions.
As of December 31, 2014 and 2013, the Company’s mortgage-backed securities and collateralized mortgage obligations portfolios consisted of securities predominantly backed by one- to four-family mortgage loans and underwritten to the standards of and guaranteed by the following government-sponsored agencies: the Federal Home Loan Mortgage Corporation (FHLMC), the Federal National Mortgage Association (FNMA), and the Government National Mortgage Association (GNMA). The receipt of principal, at par, and interest on mortgage-backed securities is guaranteed by the respective government-sponsored agency guarantor, such that the Company believes that its mortgage-backed securities do not expose the Company to credit-related losses.
At December 31, 2014, approximately 60% of the municipal obligations held by the Company were Iowa-based. The Company does not intend to sell these municipal obligations, and it is more likely than not that the Company will not be required to sell them until the recovery of its cost. Due to the issuers’ continued satisfaction of their obligations under the securities in accordance with their contractual terms and the expectation that they will continue to do so, management’s intent and ability to hold these securities for a period of time sufficient to allow for any anticipated recovery in fair value, as well as the evaluation of the fundamentals of the issuers’ financial conditions and other objective evidence, the Company believes that the municipal obligations identified in the tables above were temporarily depressed as of December 31, 2014 and 2013.
At December 31, 2013, the Company owned five collateralized debt obligations (“CDOs”) backed by pools of trust preferred securities with an original cost basis of $8.8 million. The amortized cost of these securities as of that date totaled $2.1 million after OTTI charges have been recognized. During the quarter ended March 31, 2014, the Company sold these investment securities at a net gain of $0.8 million.
As of December 31, 2014, the Company owned $2.1 million of equity securities in banks and financial service-related companies, and $1.0 million of mutual funds invested in debt securities and other debt instruments that will cause units of the fund to be deemed to be qualified under the Community Reinvestment Act. Equity securities are considered to have OTTI whenever they have been in a loss position, compared to current book value, for twelve consecutive months, and the Company does not expect them to recover to their original cost basis. For the years ended December 31, 2014 and 2013, no impairment charges were recorded, as the affected equity securities were not deemed impaired due to market prices that are above the Company's original purchase price.
The following table provides a roll forward of credit losses on fixed maturity securities recognized in net income:
	Year Ended December 31,
	2014				2013
(in thousands)
Beginning balance	$	6,639			$	7,379
Additional credit losses:
Securities with no previous other than temporary impairment	—				—
Securities with previous other than temporary impairments	—				—
Reductions to credit losses:
Securities with previous other than temporary impairments, due to liquidation	—				(740		)
Securities with previous other than temporary impairments, due to sale	(6,639		)		—
Ending balance	$	—			$	6,639
It is reasonably possible that the fair values of the Company's investment securities could decline in the future if the overall economy or the financial conditions of the issuers deteriorate or the liquidity of certain securities remains depressed. As a result, there is a risk that additional OTTI may be recognized in the future and any such amounts could be material to the Company's consolidated statements of operations.
The contractual maturity distribution of investment debt securities at December 31, 2014, is summarized as follows:
	Available For Sale								Held to Maturity
	Amortized				Fair Value				Amortized				Fair Value
	Cost								Cost
(in thousands)
Due in one year or less	$	22,476			$	22,637			$	190			$	189
Due after one year through five years	122,371				124,385				2,750				2,723
Due after five years through ten years	102,908				107,773				17,829				17,905
Due after ten years	37,569				38,520				22,202				22,113
Debt securities without a single maturity date	178,377				178,595				8,553				8,323
Total	$	463,701			$	471,910			$	51,524			$	51,253
Mortgage-backed securities and collateralized mortgage obligations are collateralized by mortgage loans, and guaranteed by U.S. government agencies. Experience has indicated that principal payments will be collected sooner than scheduled because of prepayments. Therefore, these securities are not scheduled in the maturity categories indicated above. Other equity securities available for sale with an amortized cost of $2.7 million and a fair value of $3.0 million are also excluded from this table.
Proceeds from the sales of investment securities available for sale during 2014 were $33.5 million. During 2013 there were $12.4 million sales of investment securities available for sale, while in 2012 there were $18.3 million sales of investment securities available for sale.
Other investment securities include investments in Federal Home Loan Bank (“FHLB”) stock. The carrying value of the FHLB stock at December 31, 2014 and December 31, 2013 was $8.6 million and $9.2 million, respectively, which is included in the Other Assets line of the consolidated balance sheets. This security is not readily marketable and ownership of FHLB stock is a requirement for membership in the FHLB-Des Moines. The amount of FHLB stock the Bank is required to hold is directly related to the amount of FHLB advances borrowed. Because there are no available market values for this security, it is carried at cost and evaluated for potential impairment each quarter. No impairment charges have been recognized on these securities. Redemption of this investment is at the option of the FHLB.
Realized gains and losses on sales are determined on the basis of specific identification of investments based on the trade date. Realized gains (losses) on investments, including impairment losses for the years ended December 31, 2014, 2013 and 2012, were as follows:
	Year Ended December 31,
	2014				2013				2012
(in thousands)
Available for sale fixed maturity securities:
Gross realized gains	$	1,463			$	144			$	424
Gross realized losses	(236		)		(79		)		—
Other-than-temporary impairment	—				—				(345		)
	1,227				65				79
Equity securities:
Gross realized gains	—				—				381
Gross realized losses	—				—				—
Other-than-temporary impairment	—				—				—
	—				—				381
Total net realized gains and losses	$	1,227			$	65			$	460

Loans_Receivable_and_the_Allow

Loans Receivable and the Allowance for Loan Losses	12 Months Ended
	Dec. 31, 2014
Loans Receivable and the Allowance for Loan Losses [Abstract]
Loans, Notes, Trade and Other Receivables Disclosure [Text Block]	Loans Receivable and the Allowance for Loan Losses
	The composition of allowance for loan losses, loans, and loan pool participations by portfolio segment, as of and for the years ended December 31, 2014 and 2013, were as follows:
		Allowance for Loan Losses and Recorded Investment in Loan Receivables
		For the Years Ended December 31, 2014 and 2013
	(in thousands)	Agricultural				Commercial and Industrial				Commercial Real Estate			Residential Real Estate				Consumer			Unallocated				Total
	2014
	Allowance for loan losses:
	Individually evaluated for impairment	$	88			$	206			$	226		$	623			$	2		$	—			$	1,145
	Collectively evaluated for impairment	1,418				5,574				4,173			2,544				321			1,188				15,218
	Total	$	1,506			$	5,780			$	4,399		$	3,167			$	323		$	1,188			$	16,363
	Loans acquired with deteriorated credit quality (loan pool participations)	$	—			$	70			$	669		$	82			$	9		$	1,304			$	2,134
	Loans receivable
	Individually evaluated for impairment	$	3,027			$	3,168			$	3,916		$	3,341			$	34		$	—			$	13,486
	Collectively evaluated for impairment	101,782				301,732				422,605			269,270				23,644			—				1,119,033
	Total	$	104,809			$	304,900			$	426,521		$	272,611			$	23,678		$	—			$	1,132,519
	Loans acquired with deteriorated credit quality (loan pool participations)*	$	4			$	935			$	14,246		$	3,340			$	12		$	2,929			$	21,466
	(in thousands)	Agricultural				Commercial and Industrial				Commercial Real Estate			Residential Real Estate				Consumer			Unallocated				Total
	2013
	Allowance for loan losses:
	Individually evaluated for impairment	$	125			$	559			$	513		$	220			$	6		$	—			$	1,423
	Collectively evaluated for impairment	1,233				4,421				4,781			2,965				269			1,087				14,756
	Total	$	1,358			$	4,980			$	5,294		$	3,185			$	275		$	1,087			$	16,179
	Loans acquired with deteriorated credit quality (loan pool participations)	$	3			$	64			$	627		$	88			$	6		$	1,346			$	2,134
	Loans receivable
	Individually evaluated for impairment	$	3,146			$	3,521			$	5,079		$	1,664			$	50		$	—			$	13,460
	Collectively evaluated for impairment	94,021				260,130				429,345			272,462				18,994			—				1,074,952
	Total	$	97,167			$	263,651			$	434,424		$	274,126			$	19,044		$	—			$	1,088,412
	Loans acquired with deteriorated credit quality (loan pool participations)*	$	49			$	1,302			$	18,168		$	3,823			$	18		$	4,307			$	27,667
	* The amount shown as “Unallocated” represents the carrying value of other real estate owned within the loan pool participation portfolio total.
	Loans with unpaid principal in the amount of $404.4 million at December 31, 2014 were pledged to the FHLB as collateral for borrowings.
	The changes in the allowance for loan losses by portfolio segment, as of and for the years ended December 31, 2014, 2013, and 2012 were as follows:
		Allowance for Loan Loss Activity
		For the Years Ended December 31, 2014, 2013, and 2012
	(in thousands)	Agricultural				Commercial and Industrial				Commercial Real Estate			Residential Real Estate				Consumer			Unallocated				Total
	2014
	Beginning balance	$	1,358			$	4,980			$	5,294		$	3,185			$	275		$	1,087			$	16,179
	Charge-offs	(26		)		(685		)		(165		)	(409		)		(76		)	—				(1,361		)
	Recoveries	10				217				61			22				35			—				345
	Provision	164				1,268				(791		)	369				89			101				1,200
	Ending balance	$	1,506			$	5,780			$	4,399		$	3,167			$	323		$	1,188			$	16,363
	2013
	Beginning balance	$	1,026			$	4,599			$	5,767		$	3,007			$	356		$	1,202			$	15,957
	Charge-offs	(39		)		(790		)		(545		)	(286		)		(147		)	—				(1,807		)
	Recoveries	36				70				479			67				27			—				679
	Provision	335				1,101				(407		)	397				39			(115		)		1,350
	Ending balance	$	1,358			$	4,980			$	5,294		$	3,185			$	275		$	1,087			$	16,179
	2012
	Beginning balance	$	1,209			$	5,380			$	5,171		$	3,501			$	167		$	248			$	15,676
	Charge-offs	—				(2,345		)		(129		)	(537		)		(90		)	—				(3,101		)
	Recoveries	507				423				24			31				18			—				1,003
	Provision	(690		)		1,141				701			12				261			954				2,379
	Ending balance	$	1,026			$	4,599			$	5,767		$	3,007			$	356		$	1,202			$	15,957
	Loan Portfolio Segment Risk Characteristics
	Agricultural - Agricultural loans, most of which are secured by crops, livestock, and machinery, are provided to finance capital improvements and farm operations as well as acquisitions of livestock and machinery. The ability of the borrower to repay may be affected by many factors outside of the borrower's control including adverse weather conditions, loss of livestock due to disease or other factors, declines in market prices for agricultural products and the impact of government regulations. The ultimate repayment of agricultural loans is dependent upon the profitable operation or management of the agricultural entity. Collateral for these loans generally includes accounts receivable, inventory, equipment and real estate. However, depending on the overall financial condition of the borrower, some loans are made on an unsecured basis. The collateral securing these loans may depreciate over time, may be difficult to appraise and may fluctuate in value based on the success of the business.
	Commercial and Industrial - Commercial and industrial loans are primarily made based on the reported cash flow of the borrower and secondarily on the underlying collateral provided by the borrower. The collateral support provided by the borrower for most of these loans and the probability of repayment are based on the liquidation of the pledged collateral and enforcement of a personal guarantee, if any exists. The primary repayment risks of commercial and industrial loans are that the cash flows of the borrower may be unpredictable, and the collateral securing these loans may fluctuate in value. The size of the loans the Company can offer to commercial customers is less than the size of the loans that competitors with larger lending limits can offer. This may limit the Company's ability to establish relationships with the largest businesses in the areas in which the Company operates. As a result, the Company may assume greater lending risks than financial institutions that have a lesser concentration of such loans and tend to make loans to larger businesses. Collateral for these loans generally includes accounts receivable, inventory, equipment and real estate. However, depending on the overall financial condition of the borrower, some loans are made on an unsecured basis. The collateral securing these loans may depreciate over time, may be difficult to appraise and may fluctuate in value based on the success of the business. In addition, if the U.S. economy does not continue to improve, this could harm or continue to harm the businesses of the Company’s commercial and industrial customers and reduce the value of the collateral securing these loans.
	Commercial Real Estate - The Company offers mortgage loans to commercial and agricultural customers for the acquisition of real estate used in their businesses, such as offices, warehouses and production facilities, and to real estate investors for the acquisition of apartment buildings, retail centers, office buildings and other commercial buildings. The market value of real estate securing commercial real estate loans can fluctuate significantly in a short period of time as a result of market conditions in the geographic area in which the real estate is located. Adverse developments affecting real estate values in one or more of the Company's markets could increase the credit risk associated with its loan portfolio. Additionally, real estate lending typically involves higher loan principal amounts than other loans, and the repayment of the loans generally is dependent, in large part, on sufficient income from the properties securing the loans to cover operating expenses and debt service. Economic events or governmental regulations outside of the Company’s control or that of the borrower could negatively impact the future cash flow and market values of the affected properties.
	Residential Real Estate - The Company generally retains short-term residential mortgage loans that are originated for its own portfolio but sells most long-term loans to other parties while retaining servicing rights on the majority of those loans. The market value of real estate securing residential real estate loans can fluctuate as a result of market conditions in the geographic area in which the real estate is located. Adverse developments affecting real estate values in one or more of the Company's markets could increase the credit risk associated with its loan portfolio. Additionally, real estate lending typically involves higher loan principal amounts than other loans, and the repayment of the loans generally is dependent, in large part, on the borrower's continuing financial stability, and is therefore more likely to be affected by adverse personal circumstances.
	Consumer - Consumer loans typically have shorter terms, lower balances, higher yields and higher risks of default than real estate related loans. Consumer loan collections are dependent on the borrower's continuing financial stability, and are therefore more likely to be affected by adverse personal circumstances. Collateral for these loans generally includes automobiles, boats, recreational vehicles, mobile homes, and real estate. However, depending on the overall financial condition of the borrower, some loans are made on an unsecured basis. The collateral securing these loans may depreciate over time, may be difficult to recover and may fluctuate in value based on condition. In addition, a decline in the United States economy could result in reduced employment, impacting the ability of customers to repay their obligations.
	Loans acquired with deteriorated credit quality (loan pool participations) - The underlying loans in the loan pool participations include both fixed-rate and variable-rate instruments. No amounts for interest due are reflected in the carrying value of the loan pool participations. Based on historical experience, the average period of collectibility for loans underlying loan pool participations, many of which have exceeded contractual maturity dates, is approximately three to five years. Loan pool balances are affected by the payment and refinancing activities of the borrowers resulting in pay-offs of the underlying loans and reduction in the balances. Collections from the individual borrowers are managed by the loan pool servicer and are affected by the borrower's financial ability and willingness to pay, foreclosure and legal action, collateral value, and the economy in general.
	Charge-off Policy
	The Company requires a loan to be charged-off as soon as it becomes apparent that some loss will be incurred, or when its collectability is sufficiently questionable that it no longer is considered a bankable asset. The primary considerations when determining if and how much of a loan should be charged-off are as follows: (1) the potential for future cash flows; (2) the value of any collateral; and (3) the strength of any co-makers or guarantors.
	When it is determined that a loan requires a partial or full charge-off, a request for approval of a charge-off is submitted to the Bank's President, Executive Vice President and Chief Credit Officer, and the Senior Regional Loan officer. The Bank's board of directors formally approves all loan charge-offs. Once a loan is charged-off, it cannot be restructured and returned to the Bank's books.
	The Allowance for Loan and Lease Losses - Bank Loans
	The Company requires the maintenance of an adequate allowance for loan and lease losses (“ALLL”) in order to cover estimated probable losses without eroding the Company's capital base. Calculations are done at each quarter end, or more frequently if warranted, to analyze the collectability of loans and to ensure the adequacy of the allowance. In line with FDIC directives, the ALLL calculation does not include consideration of loans held for sale or off-balance-sheet credit exposures (such as unfunded letters of credit). Determining the appropriate level for the ALLL relies on the informed judgment of management, and as such, is subject to inaccuracy. Given the inherently imprecise nature of calculating the necessary ALLL, the Company's policy permits an "unallocated" allowance between 15% above and 5% below the “indicated reserve.” These unallocated amounts are due to those overall factors impacting the ALLL that are not captured in detailed loan category calculations.
Loans Reviewed Individually for Impairment
The Company identifies loans to be reviewed and evaluated individually for impairment based on current information and events and the probability that the borrower will be unable to repay all amounts due according to the contractual terms of the loan agreement. Specific areas of consideration include: size of credit exposure, risk rating, delinquency, nonaccrual status, and loan classification.
The level of individual impairment is measured using one of the following methods: (1) the fair value of the collateral less costs to sell; (2) the present value of expected future cash flows, discounted at the loan's effective interest rate; or (3) the loan's observable market price. Loans that are deemed fully collateralized or have been charged down to a level corresponding with any of the three measurements require no assignment of reserves from the ALLL.
All loans deemed troubled debt restructure or “TDR” are considered impaired. A loan is considered a TDR when the Bank, for economic or legal reasons related to a borrower's financial difficulties, grants a concession to the borrower that the Bank would not otherwise consider. All of the following factors are potential indicators that the Bank has granted a concession (one or multiple items may be present):
•	The borrower receives a reduction of the stated interest rate for the remaining original life of the debt.
•	The borrower receives an extension of the maturity date or dates at a stated interest rate lower that the current market interest rate for new debt with similar risk characteristics.
•	The borrower receives a reduction of the face amount or maturity amount of the debt as stated in the instrument or other agreement.
•	The borrower receives a deferral of required payments (principal and/or interest).
•	The borrower receives a reduction of the accrued interest.
The following tables set forth information on the Company's TDRs by class of financing receivable occurring during the stated periods:
	For the Year Ended December 31,
	2014										2013								2012
	Number of Contracts		Pre-Modification Outstanding Recorded Investment				Post-Modification Outstanding Recorded Investment				Number of Contracts	Pre-Modification Outstanding Recorded Investment				Post-Modification Outstanding Recorded Investment			Number of Contracts		Pre-Modification Outstanding Recorded Investment				Post-Modification Outstanding Recorded Investment
(dollars in thousands)
Troubled Debt Restructurings(1):
Commercial and industrial
Amortization or maturity date change	1		1,405				1,405				10	1,546				1,546			1		551				551
Commercial real estate:
Farmland
Interest rate reduction	0		—				—				0	—				—			2		2,475				2,388
Commercial real estate-other
Amortization or maturity date change	0		—				—				2	165				136			0		—				—
Residential real estate:
One- to four- family first liens
Interest rate reduction	1		285				292				2	164				169			0		—				—
Amortization or maturity date change	0		—				—				1	66				69			0		—				—
One- to four- family junior liens
Interest rate reduction	0		—				—				1	8				13			1		135				138
Total	2		$	1,690			$	1,697			16	$	1,949			$	1,933		4		$	3,161			$	3,077
(1) TDRs may include multiple concessions and the disclosure classifications are based on the primary concession provided to the borrower.
Loans by class of financing receivable modified as TDRs within the previous 12 months and for which there was a payment default during the stated periods were:
	For the Year Ended December 31,
	2014						2013					2012
	Number of Contracts		Recorded Investment				Number of Contracts		Recorded Investment			Number of Contracts		Recorded Investment
(dollars in thousands)
Troubled Debt Restructurings(1) That Subsequently Defaulted:
Commercial and industrial
Amortization or maturity date change	0		—				0		—			1		$	547
Commercial real estate:
Commercial real estate-other
Amortization or maturity date change	0		—				1		69			0		—
Residential real estate:
One- to four- family first liens
Interest rate reduction	0		—				1		111			0		—
Total	0		$	—			2		$	180		1		$	547
(1) TDRs may include multiple concessions and the disclosure classifications are based on the primary concession provided to the borrower.
Loans Reviewed Collectively for Impairment
All loans not evaluated individually for impairment are grouped together by type (i.e. commercial, agricultural, consumer, etc.) and further segmented within each subset by risk classification (i.e. pass, special mention, and substandard). Homogeneous loans past due 60-89 days and 90 days and over are classified special mention and substandard, respectively, for allocation purposes.
The Company's historical loss experience for each loan type is calculated using the fiscal quarter-end data for the most recent 20 quarters as a starting point for estimating losses. In addition, other prevailing qualitative or environmental factors likely to cause probable losses to vary from historical data are incorporated in the form of adjustments to increase or decrease the loss rate applied to each group. These adjustments are documented and fully explain how the current information, events, circumstances, and conditions impact the historical loss measurement assumptions.
Although not a comprehensive list, the following are considered key factors and are evaluated with each calculation of the ALLL to determine if adjustments to historical loss rates are warranted:
•	Changes in lending policies and procedures, including changes in underwriting standards and collection, charge-off, and recovery practices not considered elsewhere in estimating credit losses.
•	Changes in international, national, regional, and local economic and business conditions and developments that affect the collectability of the portfolio, including the condition of various market segments.
•	Changes in the nature and volume of the portfolio and in the terms of loans.
•	Changes in the experience, ability and depth of lending management and other relevant staff.
•	Changes in the volume and severity of past due loans, the volume of nonaccrual loans, and the volume and severity of adversely classified or graded loans.
•	Changes in the quality of our loan review system.
•	Changes in the value of underlying collateral for collateral-dependent loans.
•	The existence and effect of any concentrations of credit, and changes in the level of such concentrations.
•	The effect of other external factors, such as competition and legal and regulatory requirements, on the level of estimated credit losses in the Bank’s existing portfolio.
The items listed above are used to determine the pass percentage for loans evaluated collectively and, as such, are applied to the loans risk rated pass. Due to the inherent risks associated with special mention risk rated loans (i.e. early stages of financial deterioration, technical exceptions, etc.), this subset is reserved at two times the pass allocation factor to reflect this increased risk exposure. In addition, non-impaired loans classified as substandard loans carry greater risk than special mention loans, and as such, this subset is reserved at six times the pass allocation. Further, non-impaired loans less than $0.2 million that are past due 60 - 89 days or 90 days and over, are respectively classified as special mention or substandard. They are given an increased loan loss allocation of 25% or 50%, respectively, above the five-year historical loss rate of the specific loan type.
The Allowance for Loan and Lease Losses - Loan Pool Participations
The Company requires the maintenance of an adequate allowance for loan pool participation losses (“ALLL”) in order to cover estimated probable losses. Currently, charge-offs are netted against the income the Company receives, thus the balance in the loan pool reserve is not affected and remains stable. In essence, a provision for loan losses is made that is equal to the quarterly charge-offs, which is deducted from income received from the loan pools. By maintaining a sufficient reserve to cover the next quarter’s charge-offs, the Company will have sufficient reserves in place should no income be collected from the loan pools during the quarter. In the event the estimated charge-offs provided by the servicer are greater than the loan pool ALLL, an additional provision is made to cover the difference between the current ALLL and the estimated charge-offs provided by the servicer.
Loans Reviewed Individually for Impairment
The loan servicer reviews the portfolio quarterly on a loan-by-loan basis, and loans that are deemed to be impaired are charged-down to their estimated value during the next calendar quarter. All loans that are to be charged-down are reserved against in the ALLL adequacy calculation. Loans that continue to have an investment basis that have been charged-down are monitored, and, if additional impairment is noted, the reserve requirement is increased on the individual loan.
Loans Reviewed Collectively for Impairment
The Company utilizes the annualized average of portfolio loan (not loan pool participation) historical loss per risk category over a two year period of time. Supporting documentation for the technique used to develop the historical loss rate for each group of loans is required to be maintained. It is management’s assessment that the two year rate is most reflective of the estimated credit losses in the current loan pool portfolio.
The following table sets forth the composition of the Company’s loans and loan pool participations by internally assigned credit quality indicators at December 31, 2014 and 2013:
	Pass				Special Mention/Watch				Substandard			Doubtful				Loss			Total
(in thousands)
2014
Agricultural	$	98,096			$	5,032			$	1,681		$	—			$	—		$	104,809
Commercial and industrial	273,290				7,468				22,350			—				—			303,108
Credit cards	1,240				6				—			—				—			1,246
Overdrafts	373				262				109			—				—			744
Commercial real estate:
Construction & development	56,963				1,151				1,269			—				—			59,383
Farmland	79,629				1,778				2,293			—				—			83,700
Multifamily	54,708				178				—			—				—			54,886
Commercial real estate-other	215,268				11,216				2,068			—				—			228,552
Total commercial real estate	406,568				14,323				5,630			—				—			426,521
Residential real estate:
One- to four- family first liens	211,390				3,933				3,991			—				—			219,314
One- to four- family junior liens	53,039				48				210			—				—			53,297
Total residential real estate	264,429				3,981				4,201			—				—			272,611
Consumer	23,431				8				41			—				—			23,480
Total	$	1,067,427			$	31,080			$	34,012		$	—			$	—		$	1,132,519
Loans acquired with deteriorated credit quality (loan pool participations)	$	10,256			$	—			$	11,202		$	—			$	8		$	21,466
2013
Agricultural	$	93,187			$	460			$	3,520		$	—			$	—		$	97,167
Commercial and industrial	239,485				11,097				11,786			—				—			262,368
Credit cards	1,010				1				17			—				—			1,028
Overdrafts	326				123				88			—				—			537
Commercial real estate:
Construction & development	56,112				14,984				1,493			—				—			72,589
Farmland	80,044				3,091				2,340			—				—			85,475
Multifamily	53,315				1,732				396			—				—			55,443
Commercial real estate-other	205,914				12,994				2,009			—				—			220,917
Total commercial real estate	395,385				32,801				6,238			—				—			434,424
Residential real estate:
One- to four- family first liens	213,815				3,994				2,859			—				—			220,668
One- to four- family junior liens	53,225				38				195			—				—			53,458
Total residential real estate	267,040				4,032				3,054			—				—			274,126
Consumer	18,643				57				62			—				—			18,762
Total	$	1,015,076			$	48,571			$	24,765		$	—			$	—		$	1,088,412
Loans acquired with deteriorated credit quality (loan pool participations)	$	13,569			$	—			$	14,093		$	—			$	5		$	27,667
Special Mention/Watch - A special mention/watch asset has potential weaknesses that deserve management's close attention. If left uncorrected, these potential weaknesses may result in deterioration of the repayment prospects for the asset or in the Company's credit position at some future date. Special mention/watch assets are not adversely classified and do not expose the Company to sufficient risk to warrant adverse classification.
Substandard - Substandard loans are inadequately protected by the current net worth and paying capacity of the obligor or of the collateral pledged, if any. Loans so classified must have a well defined weakness or weaknesses that jeopardize the liquidation of the debt. They are characterized by the distinct possibility that the Bank will sustain some loss if the deficiencies are not corrected.
Doubtful - Loans classified doubtful have all the weaknesses inherent in those classified substandard with the added characteristic that the weaknesses make collection or liquidation in full, on the basis of currently known facts, conditions and values, highly questionable and improbable.
Loss - Loans classified loss are generally considered uncollectible and of such little value that their continuance as bankable assets is not warranted. This classification does not mean that the loan has absolutely no recovery or salvage value but rather it is not practical or desirable to defer writing off this basically worthless asset even though partial recovery may be effected in the future.
The following tables set forth the amounts and categories of the Company’s impaired loans as of December 31, 2014 and 2013:
	As of December 31,
	2014											2013
	Recorded Investment				Unpaid Principal Balance				Related Allowance			Recorded Investment				Unpaid Principal Balance			Related Allowance
(in thousands)
With no related allowance recorded:
Agricultural	$	1,410			$	1,910			$	—		$	1,475			$	1,975		$	—
Commercial and industrial	2,169				2,270				—			1,919				2,020			—
Credit cards	—				—				—			—				—			—
Overdrafts	—				—				—			—				—			—
Commercial real estate:
Construction & development	49				176				—			132				601			—
Farmland	2,270				2,433				—			93				107			—
Multifamily	—				—				—			—				—			—
Commercial real estate-other	939				1,064				—			587				612			—
Total commercial real estate	3,258				3,673				—			812				1,320			—
Residential real estate:
One- to four- family first liens	535				773				—			622				741			—
One- to four- family junior liens	134				157				—			50				50			—
Total residential real estate	669				930				—			672				791			—
Consumer	6				22				—			10				26			—
Total	$	7,512			$	8,805			$	—		$	4,888			$	6,132		$	—
With an allowance recorded:
Agricultural	$	1,617			$	1,617			$	88		$	1,671			$	1,671		$	125
Commercial and industrial	999				999				206			1,602				1,657			559
Credit cards	—				—				—			—				—			—
Overdrafts	—				—				—			—				—			—
Commercial real estate:
Construction & development	34				34				34			7				7			3
Farmland	74				74				4			2,311				2,461			219
Multifamily	—				—				—			—				—			—
Commercial real estate-other	550				550				188			1,949				2,164			291
Total commercial real estate	658				658				226			4,267				4,632			513
Residential real estate:
One- to four- family first liens	2,600				2,600				594			902				902			170
One- to four- family junior liens	72				72				29			90				90			50
Total residential real estate	2,672				2,672				623			992				992			220
Consumer	28				28				2			40				40			6
Total	$	5,974			$	5,974			$	1,145		$	8,572			$	8,992		$	1,423
Total:
Agricultural	$	3,027			$	3,527			$	88		$	3,146			$	3,646		$	125
Commercial and industrial	3,168				3,269				206			3,521				3,677			559
Credit cards	—				—				—			—				—			—
Overdrafts	—				—				—			—				—			—
Commercial real estate:
Construction & development	83				210				34			139				608			3
Farmland	2,344				2,507				4			2,404				2,568			219
Multifamily	—				—				—			—				—			—
Commercial real estate-other	1,489				1,614				188			2,536				2,776			291
Total commercial real estate	3,916				4,331				226			5,079				5,952			513
Residential real estate:
One- to four- family first liens	3,135				3,373				594			1,524				1,643			170
One- to four- family junior liens	206				229				29			140				140			50
Total residential real estate	3,341				3,602				623			1,664				1,783			220
Consumer	34				50				2			50				66			6
Total	$	13,486			$	14,779			$	1,145		$	13,460			$	15,124		$	1,423
The following table sets forth the average recorded investment and interest income recognized for each category of the Company’s impaired loans during the stated periods:
	For the Year Ended December 31,
	2014								2013							2012
	Average Recorded Investment				Interest Income Recognized				Average Recorded Investment			Interest Income Recognized				Average Recorded Investment			Interest Income Recognized
(in thousands)
With no related allowance recorded:
Agricultural	$	1,413			$	211			$	1,128		$	114			$	1,600		$	60
Commercial and industrial	2,234				160				2,025			76				965			52
Credit cards	—				—				—			—				—			—
Overdrafts	—				—				—			—				—			—
Commercial real estate:
Construction & development	49				—				149			21				316			—
Farmland	2,288				456				101			8				83			8
Multifamily	—				—				—			—				—			—
Commercial real estate-other	975				(3		)		593			25				1,770			72
Total commercial real estate	3,312				453				843			54				2,169			80
Residential real estate:
One- to four- family first liens	547				32				669			14				143			4
One- to four- family junior liens	134				6				50			1				43			3
Total residential real estate	681				38				719			15				186			7
Consumer	8				—				12			—				16			—
Total	$	7,648			$	862			$	4,727		$	259			$	4,936		$	199
With an allowance recorded:
Agricultural	$	1,627			$	203			$	1,681		$	51			$	1,723		$	50
Commercial and industrial	1,044				104				1,697			75				1,044			36
Credit cards	—				—				—			—				—			—
Overdrafts	—				—				—			—				—			—
Commercial real estate:
Construction & development	35				3				7			—				526			30
Farmland	74				3				2,315			110				2,504			114
Multifamily	—				—				—			—				—			—
Commercial real estate-other	551				43				1,921			55				559			18
Total commercial real estate	660				49				4,243			165				3,589			162
Residential real estate:
One- to four- family first liens	2,612				203				909			38				645			33
One- to four- family junior liens	74				—				92			1				68			2
Total residential real estate	2,686				203				1,001			39				713			35
Consumer	31				5				41			2				24			2
Total	$	6,048			$	564			$	8,663		$	332			$	7,093		$	285
Total:
Agricultural	$	3,040			$	414			$	2,809		$	165			$	3,323		$	110
Commercial and industrial	3,278				264				3,722			151				2,009			88
Credit cards	—				—				—			—				—			—
Overdrafts	—				—				—			—				—			—
Commercial real estate:
Construction & development	84				3				156			21				842			30
Farmland	2,362				459				2,416			118				2,587			122
Multifamily	—				—				—			—				—			—
Commercial real estate-other	1,526				40				2,514			80				2,329			90
Total commercial real estate	3,972				502				5,086			219				5,758			242
Residential real estate:
One- to four- family first liens	3,159				235				1,578			52				788			37
One- to four- family junior liens	208				6				142			2				111			5
Total residential real estate	3,367				241				1,720			54				899			42
Consumer	39				5				53			2				40			2
Total	$	13,696			$	1,426			$	13,390		$	591			$	12,029		$	484
The following table sets forth the composition and past due status of the Company’s loans at December 31, 2014 and 2013:
	30 - 59 Days Past Due				60 - 89 Days Past Due				90 Days or More Past Due			Total Past Due				Current			Total Loans Receivable				Recorded Investment > 90 Days Past Due and Accruing
(in thousands)
2014
Agricultural	$	58			$	30			$	—		$	88			$	104,721		$	104,809			$	—
Commercial and industrial	897				603				515			2,015				301,093			303,108				66
Credit cards	3				3				—			6				1,240			1,246				—
Overdrafts	104				2				4			110				634			744				—
Commercial real estate:
Construction & development	—				—				83			83				59,300			59,383				—
Farmland	503				—				—			503				83,197			83,700				—
Multifamily	—				—				—			—				54,886			54,886				—
Commercial real estate-other	168				57				1,200			1,425				227,127			228,552				—
Total commercial real estate	671				57				1,283			2,011				424,510			426,521				—
Residential real estate:
One- to four- family first liens	1,481				581				2,023			4,085				215,229			219,314				780
One- to four- family junior liens	105				48				192			345				52,952			53,297				—
Total residential real estate	1,586				629				2,215			4,430				268,181			272,611				780
Consumer	35				8				23			66				23,414			23,480				2
Total	$	3,354			$	1,332			$	4,040		$	8,726			$	1,123,793		$	1,132,519			$	848
2013
Agricultural	$	65			$	23			$	52		$	140			$	97,027		$	97,167			$	—
Commercial and industrial	610				876				960			2,446				259,922			262,368				213
Credit cards	—				1				17			18				1,010			1,028				17
Overdrafts	40				1				48			89				448			537				—
Commercial real estate:
Construction & development	84				—				56			140				72,449			72,589				—
Farmland	—				—				—			—				85,475			85,475				—
Multifamily	—				—				395			395				55,048			55,443				395
Commercial real estate-other	604				190				1,740			2,534				218,383			220,917				164
Total commercial real estate	688				190				2,191			3,069				431,355			434,424				559
Residential real estate:
One- to four- family first liens	1,891				869				984			3,744				216,924			220,668				540
One- to four- family junior liens	316				38				175			529				52,929			53,458				49
Total residential real estate	2,207				907				1,159			4,273				269,853			274,126				589
Consumer	17				62				36			115				18,647			18,762				7
Total	$	3,627			$	2,060			$	4,463		$	10,150			$	1,078,262		$	1,088,412			$	1,385
Non-accrual and Delinquent Loans
Loans are placed on non-accrual when (1) payment in full of principal and interest is no longer expected or (2) principal or interest has been in default for 90 days or more (unless the loan is both well secured with marketable collateral and in the process of collection). All loans rated doubtful or worse, and certain loans rated substandard, are placed on non-accrual.
A non-accrual asset may be restored to an accrual status when (1) all past due principal and interest has been paid (excluding renewals and modifications that involve the capitalizing of interest) or (2) the loan becomes well secured with marketable collateral and is in the process of collection. An established track record of performance is also considered when determining accrual status.
Delinquency status of a loan is determined by the number of days that have elapsed past the loan's payment due date, using the following classification groupings: 30-59 days, 60-89 days and 90 days or more. Loans shown in the 30-59 days and 60-89 days columns in the table above reflect contractual delinquency status of loans not considered nonperforming due to classification as a TDR or being placed on non-accrual.
The following table sets forth the composition of the Company’s recorded investment in loans on nonaccrual status as of December 31, 2014 and 2013:
	As of December 31,
	2014				2013
(in thousands)
Agricultural	$	—			$	52
Commercial and industrial	479				746
Credit cards	—				—
Overdrafts	—				—
Commercial real estate:
Construction & development	83				139
Farmland	24				29
Multifamily	—				—
Commercial real estate-other	1,200				1,576
Total commercial real estate	1,307				1,744
Residential real estate:
One- to four- family first liens	1,261				543
One- to four- family junior liens	192				126
Total residential real estate	1,453				669
Consumer	16				29
Total	$	3,255			$	3,240
As of December 31, 2014, the Company had no commitments to lend additional funds to borrowers who have had a TDR.
A summary of the changes in the carrying value of loan pool participations for the years ended December 31, 2014 and 2013, is as follows:
	For the Year Ended December 31,
	2014				2013
(in thousands)
Balance at beginning of year	$	25,533			$	35,650
Principal payments	(4,724		)		(8,687		)
Net charge-offs	(1,477		)		(1,430		)
Balance at end of year	$	19,332			$	25,533
Total face value at end of year	$	68,376			$	80,902
Loan Pool Participations
ASC Topic 310 addresses accounting for differences between contractual cash flows and cash flows expected to be collected from an investor’s initial investment in loans or debt securities acquired in a transfer if those differences are attributable, at least in part, to credit quality. The loans underlying the loan pool participations were evaluated individually when purchased for application of ASC Topic 310, utilizing various criteria including: past-due status, late payments, legal status of the loan (not in foreclosure, judgment against the borrower, or referred to legal counsel), frequency of payments made, collateral adequacy and the borrower’s financial condition. If all the criteria were met, the individual loan utilized the accounting treatment required by ASC Topic 310 with the accretable yield difference between the expected cash flows and the purchased basis accreted into income on the level yield basis over the anticipated life of the loan. If any of the six criteria were not met at the time of purchase, the loan was accounted for on the cash basis of accounting.
The loan servicer reviews the portfolio quarterly on a loan-by-loan basis, and loans that are deemed to be impaired are charged-down to their estimated value. As of December 31, 2014, approximately 70% of the loans were contractually current or less than 90 days past due, while 30% were contractually past due 90 days or more. Many of the loans were acquired in a contractually past due status, which is reflected in the discounted purchase price of the loans. Performance status is monitored on a monthly basis. The 30% of loans contractually past due includes loans in litigation and foreclosed property.
The Company evaluated all loans under the ASC Topic 310 criteria as of December 31, 2014 and 2013 and determined that certain loans did not meet the criteria for level-yield income recognition required by ASC Topic 310. The outstanding balance of those loans was $65.0 million with a carrying value of $18.9 million as of December 31, 2014, and $76.9 million and $24.6 million, respectively, as of December 31, 2013. Income from these loans is realized on a cash basis, or when payments are actually received from the borrower.
The outstanding balances and carrying values as of December 31, 2014 and 2013, of the loans purchased that met the level-yield income recognition criteria under ASC Topic 310 are as follows:
	As of December 31,
	2014				2013
(in thousands)
Commercial	477				502
Real Estate:
1-4 family residences	201				229
Commercial	1,930				2,320
Total real estate	2,131				2,549
Total	$	2,608			$	3,051
Allowance	(56		)		(48		)
Carrying amount, net of allowance	$	2,552			$	3,003
Changes in accretable yield on the loans that met the level-yield income recognition criteria under ASC Topic 310 were as follows:
	Accretable Yield December 31,
	2014				2013
(in thousands)
Balance at beginning of year	$	2,244			$	2,627
Additions	—				—
Accretions	(665		)		(383		)
Reclassifications to nonaccretable differences	—				—
Balance at end of year	$	1,579			$	2,244
Cash flows expected to be collected at acquisition	$	7,913			$	8,128
Basis in acquired loans at acquisition	$	4,482			$	4,638

Premises_and_Equipment

Premises and Equipment	12 Months Ended
	Dec. 31, 2014
Premises and Equipment [Abstract]
Property, Plant and Equipment Disclosure [Text Block]	Premises and Equipment
	Premises and equipment as of December 31, 2014 and 2013 were as follows:
		As of December 31,
		2014		2013
	(in thousands)
	Land	$	4,836	$	4,836
	Buildings and leasehold improvements	29,942		30,278
	Furniture and equipment	13,206		13,741
	Construction in process	14,705		3,774
	Premises and equipment	62,689		52,629
	Accumulated depreciation and amortization	24,919		24,947
	Premises and equipment, net	$	37,770	$	27,682
	Premises and equipment depreciation and amortization expense for the years ended December 31, 2014, 2013 and 2012 was $2.2 million, $2.4 million and $2.3 million, respectively.

Intangible_Assets

Intangible Assets	12 Months Ended
	Dec. 31, 2014
Intangible Assets [Abstract]
Goodwill and Intangible Assets Disclosure [Text Block]	Intangible Assets
	Amortization of intangible assets is recorded using an accelerated method based on the estimated useful life of the core deposit intangible, customer list intangible and insurance agency intangible. Projections of amortization expense are based on existing asset balances and the remaining useful lives.
	The trade name intangible is not amortized but is evaluated for impairment annually or whenever events or changes in circumstances indicate that the carrying value may not be recoverable. No impairment was recorded on this asset in 2014, 2013, or 2012.
	The following table summarizes the amounts and carrying values of intangible assets as of December 31, 2014 and 2013:
		Weighted		Gross						Unamortized
		Average		Carrying			Accumulated			Intangible
		Useful Life		Amount			Amortization			Assets
	(dollars in thousands)	(years)
	December 31, 2014
	Other intangible assets:
	Insurance agency intangible	7		$	1,320		$	956		$	364
	Core deposit premium	4		5,433			4,742			691
	Trade name intangible	—		7,040			—			7,040
	Customer list intangible	9		330			166			164
	Total			$	14,123		$	5,864		$	8,259
	December 31, 2013
	Other intangible assets:
	Insurance agency intangible	8		$	1,320		$	850		$	470
	Core deposit premium	5		5,433			4,322			1,111
	Trade name intangible	—		7,040			—			7,040
	Customer list intangible	10		330			145			185
	Total			$	14,123		$	5,317		$	8,806
	The following table summarizes future amortization expense of intangible assets:
		Insurance			Core			Customer
		Agency			Deposit			List
		Intangible			Premium			Intangible			Totals
	(in thousands)
	Year ending December 31,
	2015	$	89		$	321		$	21		$	431
	2016	72			222			20			314
	2017	55			123			19			197
	2018	38			25			18			81
	2019	21			—			17			38
	Thereafter	89			—			69			158
	Total	$	364		$	691		$	164		$	1,219

Other_Assets

Other Assets	12 Months Ended
	Dec. 31, 2014
Other Assets [Abstract]
Other Assets Disclosure [Text Block]	Other Assets
	The components of the Company’s other assets as of December 31, 2014 and 2013 were as follows:
		As of December 31,
		2014		2013
	(in thousands)
	Federal Home Loan Bank Stock	$	8,582	$	9,226
	Prepaid expenses	1,350		1,030
	Mortgage servicing rights	2,308		2,298
	Accounts receivable & other miscellaneous assets	1,835		2,006
		$	14,075	$	14,560
	The Bank is a member of The Federal Home Loan Bank of Des Moines, and ownership of FHLB stock is a requirement for membership in the FHLB Des Moines. The amount of FHLB stock the Bank is required to hold is directly related to the amount of FHLB advances borrowed. Because this security is not readily marketable and there are no available market values, this security is carried at cost and evaluated for potential impairment each quarter. Redemption of this investment is at the option of the FHLB.
	Mortgage servicing rights are recorded at fair value based on assumptions provided by a third-party valuation service. The valuation model incorporates assumptions that market participants would use in estimating future net servicing income, such as the servicing cost per loan, the discount rate, the escrow float rate, an inflation rate, ancillary income, prepayment speeds and default rates and losses.

Loans_Serviced_for_Others

Loans Serviced for Others	12 Months Ended
	Dec. 31, 2014
Loans Serviced for Others [Abstract]
Loans Serviced For Others [Text Block]	Loans Serviced for Others
	Loans serviced for others are not included in the accompanying consolidated balance sheets. The unpaid principal balances of mortgage and other loans serviced for others were $370.0 million and $362.9 million at December 31, 2014 and 2013, respectively. Servicing loans for others generally consists of collecting mortgage payments, maintaining escrow accounts, disbursing payments to investors and collection and foreclosure processing. Loan servicing income is recorded on the accrual basis and includes servicing fees from investors and certain charges collected from borrowers, such as late payment fees, and is net of fair value adjustments to capitalized mortgage servicing rights.

Time_Deposits

Time Deposits	12 Months Ended
	Dec. 31, 2014
Time Deposits [Abstract]
Deposit Liabilities Disclosures [Text Block]	Time Deposits
	Time deposits that meet or exceed the FDIC Insurance limit of $250,000 at December 31, 2014 was $150.2 million.
	At December 31, 2014, the scheduled maturities of certificates of deposits were as follows:
	(in thousands)
	2015	$	267,510
	2016	127,149
	2017	60,174
	2018	9,004
	2019	9,177
	Total	$	473,014
	The Company had $6.1 million and $12.9 million in brokered time deposits through the CDARS program as of December 31, 2014 and December 31, 2013, respectively. The CDARS program coordinates, on a reciprocal basis, a network of banks to spread deposits exceeding the FDIC insurance coverage limits out to numerous institutions in order to provide insurance coverage for all participating deposits.

ShortTerm_Borrowings

Short-Term Borrowings	12 Months Ended
	Dec. 31, 2014
Short-term Debt [Abstract]
Debt Disclosure [Text Block]	Short-Term Borrowings
	At December 31, 2014 and 2013, the Company had no borrowings through the Federal Reserve Discount Window, while the borrowing capacity was $11.8 million and $11.4 million, respectively. As of December 31, 2014, the Bank had $13.1 million of municipal securities pledged to the Federal Reserve to secure potential borrowings. The Company also has various other unsecured Federal Funds agreements with correspondent banks. As of December 31, 2014 and 2013 there were $17.4 million and $5.5 million borrowings through these correspondent bank federal funds agreements, respectively.
	Securities sold under repurchase agreements are used by the Company to acquire funds from customers where the customer is required or desires to have its funds supported by collateral consisting of U.S. Treasury securities, U.S. Government agencies or other types of securities. The repurchase agreement is a promise to sell these securities to a customer at a certain price and repurchase them within one to four days after the transaction date at that same price plus interest accrued at an agreed upon rate. As of December 31, 2014 and December 31, 2013, the Company’s balance of securities sold under repurchase agreements was $60.8 million and $61.2 million, respectively. The weighted average interest rate on these agreements was 0.21% at December 31, 2014 and 2013.

Federal_Home_Loan_Bank_Borrowi

Federal Home Loan Bank Borrowings and Long-Term Debt	12 Months Ended
	Dec. 31, 2014
Federal Home Loan Bank Borrowings and Long-Term Debt [Abstract]
Federal Home Loan Bank Borrowings and Long-Term Debt [Text Block]	Federal Home Loan Bank Borrowings and Long-Term Debt
	As a member of The Federal Home Loan Bank of Des Moines, the Bank may borrow funds from the FHLB in amounts up to 35% of the Bank’s total assets, provided the Bank is able to pledge an adequate amount of qualified assets to secure the borrowings. Advances from the FHLB are collateralized primarily by 1-4 unit residential, commercial and agricultural real estate first mortgages equal to various percentages of the total outstanding notes. As of December 31, 2014, the Bank had $263.4 million of collateral pledged to the FHLB. As of December 31, 2014 and 2013, Federal Home Loan Bank borrowings were as follows:
		Rates					Amount
		Minimum			Maximum		2014		2013
	(in thousands)
	Due in 2014	1.25	%	to	3.4	%	$	—	$	39,900
	Due in 2015	2.06	%	to	3	%	20,000		20,000
	Due in 2016	1.13	%	to	2.46	%	17,000		17,000
	Due in 2017	1.09	%	to	2.78	%	10,000		10,000
	Due in 2018	1.3	%	to	1.83	%	17,000		5,000
	Due in 2019	1.42	%	to	1.85	%	17,000		10,000
	Thereafter	1.52	%	to	2.25	%	12,000		5,000
	Total						$	93,000	$	106,900
	In connection with the Company’s merger with the Former MidWestOne in March 2008, the Company acquired $15.5 million in long-term subordinated debt from the Former MidwestOne’s issuance of a pooled trust preferred security. The junior subordinated debentures supporting the trust preferred securities have a maturity date of December 15, 2037, do not require any principal amortization and became callable on December 15, 2012 at par, and are callable in whole or in part, on any interest payment date thereafter, at the Company’s option. The interest rate on the trust preferred securities is variable based on the three-month LIBOR rate plus 1.59% with interest payable quarterly. At December 31, 2014, the interest rate on the debt was 1.83%. During 2014 the interest rate ranged from 1.83% to 1.82%. Interest expense recorded during 2014 and 2013 was $0.3 million.

Income_Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2014
Income Taxes [Abstract]
Income Tax Disclosure [Text Block]	Income Taxes
	Income taxes for the years ended December 31, 2014, 2013 and 2012 are summarized as follows:
		December 31,
		2014			2013			2012
	(in thousands)
	Current:
	Federal	$	3,573		$	6,841		$	4,165
	State	956			1,259			1,103
	Deferred	2,502			(1,454		)	(54		)
	Total income tax provision	$	7,031		$	6,646		$	5,214
	The income tax provisions for the years ended December 31, 2014, 2013 and 2012 were less than the amounts computed by applying the maximum effective federal income tax rate of 35% for the years ended December 31, 2014 and 2013, and 34% for the year of 2012, to the income before income taxes because of the following items:
		2014			2013			2012
	(in thousands)
	Expected provision	$	8,943		$	8,839		$	7,394
	Tax-exempt interest	(2,520		)	(2,345		)	(2,213		)
	Bank-owned life insurance	(385		)	(322		)	(323		)
	State income taxes, net of federal income tax benefit	798			776			723
	Non-deductible acquisition expenses	261			—			—
	Other	(66		)	(302		)	(367		)
	Total income tax provision	$	7,031		$	6,646		$	5,214
	Net deferred tax assets as of December 31, 2014 and 2013 consisted of the following components:
		December 31,
		2014			2013
	(in thousands)
	Deferred income tax assets:
	Allowance for loan losses	$	7,981		$	7,753
	Deferred compensation	1,022			1,076
	Net operating losses	3,266			3,089
	Impairment losses on securities	53			2,613
	Other real estate owned	568			767
	Nonaccrual interest	206			434
	Other	1,072			931
	Gross deferred tax assets	14,168			16,663
	Deferred income tax liabilities:
	Premises and equipment depreciation and amortization	1,992			2,012
	Federal Home Loan Bank stock	132			132
	Purchase accounting adjustments	684			895
	Mortgage servicing rights	875			871
	Prepaid expenses	213			105
	Unrealized gains on investment securities	3,234			620
	Deferred loan fees	249			238
	Other	253			315
	Gross deferred tax liabilities	7,632			5,188
	Net deferred income tax asset	6,536			11,475
	Valuation allowance	3,458			3,281
	Net deferred tax asset	$	3,078		$	8,194
	The Company has recorded a deferred tax asset for the future tax benefits of Iowa net operating loss carry forwards and certain impairment losses on investment securities. The Iowa net operating loss carry forwards amounting to approximately $38.2 million will expire in various amounts from 2018 to 2035. As of December 31, 2014 and 2013, the Company believed it was more likely than not that all temporary differences associated with the Iowa corporate tax return, as well as certain impairment and capital losses on securities at the federal and state level, would not be fully realized. Accordingly, the Company has recorded a valuation allowance to reduce the net operating loss carry forwards and certain impairment losses on securities. A valuation allowance related to the remaining deferred tax assets has not been provided because management believes it is more likely than not that the results of future operations will generate sufficient taxable income to realize the deferred tax assets.
	The Company had no material unrecognized tax benefits as of December 31, 2014 and 2013.

Employee_Benefit_Plans

Employee Benefit Plans	12 Months Ended
	Dec. 31, 2014
Employee Benefit Plans [Abstract]
Compensation and Employee Benefit Plans [Text Block]	Employee Benefit Plans
	Prior to the Company’s merger with the Former MidWestOne, the Bank sponsored a noncontributory defined benefit pension plan for substantially all its employees. Effective December 31, 2007, the Bank elected to curtail the plan by limiting this employee benefit to those employees vested as of December 31, 2007. During the second quarter of 2012, the Company completed the liquidation of plan assets and full termination of the plan, including full benefit payout to plan participants. The total amount of the Company’s required contribution to fully fund the plan for liquidation was $6.1 million, pre-tax, which is included in Salaries and Employee Benefits expense on the 2012 consolidated statements of operations.
	The Company has a salary reduction profit-sharing 401(k) plan covering all employees fulfilling minimum age and service requirements. Employee contributions to the plan are optional. Employer contributions are discretionary and may be made to the plan in an amount equal to a percentage of each participating employee’s salary. The 401(k) contribution expense for this plan totaled $676,000, $647,000 and $667,000 for the years ended December 31, 2014, 2013 and 2012, respectively.
	The Company has an employee stock ownership plan (ESOP) covering all employees fulfilling minimum age and service requirements. Employer contributions are discretionary and may be made to the plan in an amount equal to a percentage of each participating employee’s salary. The ESOP contribution expense for this plan totaled $538,000, $609,000 and $635,000 for the years ended December 31, 2014, 2013 and 2012, respectively.
	The Company has a salary continuation plan for several officers and directors. These plans provide annual payments of various amounts upon retirement or death. The Company accrues the expense for these benefits by charges to operating expense during the period the respective officer or director attains full eligibility. The amount charged to operating expense during the years ended December 31, 2014, 2013 and 2012 totaled $294,000, $350,000 and $359,000, respectively. To provide the retirement benefits, the Company carries life insurance policies which had cash values totaling $14.3 million, $13.9 million and $13.5 million at December 31, 2014, 2013 and 2012, respectively.

Stock_Compensation_Plans

Stock Compensation Plans	12 Months Ended
	Dec. 31, 2014
Stock Compensation Plans [Abstract]
Disclosure of Compensation Related Costs, Share-based Payments [Text Block]	Stock Compensation Plans
	The Company maintains the MidWestOne Financial Group, Inc. 2008 Equity Incentive Plan (the “Plan”) as a means to attract, retain and reward certain designated employees and directors of, and service providers to, the Company and its subsidiaries. Under the terms of the Plan, the Company may grant a total of 750,000 total shares of the Company’s common stock as stock options, stock appreciation rights or stock awards (including restricted stock units) and may also grant cash incentive awards to eligible individuals. As of December 31, 2014 and 2013, 492,878 and 514,191 shares, respectively, of the Company’s common stock remained available for future awards under the Plan.
	During 2014, the Company recognized $493,000 of stock based compensation expense, which consisted of $493,000 of expense related to restricted stock unit grants and no expense related to stock option grants. In comparison, during 2013, the Company recognized $384,000 of stock-based compensation expense, which consisted of $380,000 for restricted stock unit grants and $4,000 for stock option grants, while total stock-based compensation expense in 2012 was $266,000 which consisted of $234,000 for restricted stock unit grants and $32,000 for stock option grants.
	Incentive Stock Options:
	The Company is required to estimate the fair value of share-based payment awards on the date of grant using an option-pricing model. The value of the portion of the award that is ultimately expected to vest is recognized as compensation expense in the Company’s consolidated statements of operations over the requisite service periods using a straight-line method. The Company assumes no projected forfeitures on its stock-based compensation, since actual historical forfeiture rates on its stock-based incentive awards have been negligible.
	The stock options have a maximum term of ten years, an exercise price equal to the fair market value of a share of stock on the date of grant and vest 25% per year over four years, with the first vesting date being the one-year anniversary of the grant date.
	The following is a summary of stock option activity for the year ended December 31, 2014:
						Weighted-
						Average
				Weighted-		Remaining	Aggregate
				Average		Contractual	Intrinsic
				Exercise		Term in	Value
		Shares		Price		Years	$0
	Outstanding at December 31, 2013	47,590		$	15.66
	Granted	—		—
	Exercised	(15,419	)	18.5
	Forfeited	—		—
	Expired	(1,310	)	19.5
	Outstanding at December 31, 2014	30,861		$	14.08	3.1	$	455
	Exercisable at December 31, 2014	30,861		$	14.08	3.1	$	455
	During 2014, the Company received $282,000 of cash from the exercise of stock option awards and recorded a $8,000 tax benefit from these exercises. Plan participants realized an intrinsic value of $109,000 from the exercise of these stock options during 2014. In comparison, Plan participants realized an intrinsic value of $362,000 and $278,000 from the exercise of stock options during 2013 and 2012, respectively. As of December 31, 2014, there were no remaining compensation costs related to nonvested stock options that have not yet been recognized.
	There were no stock option awards granted in 2014, 2013, or 2012.
	Restricted Stock Units:
	Under the Plan, the Company may grant restricted stock unit awards that vest upon the completion of future service requirements or specified performance criteria. The fair value of these awards is equal to the market price of the common stock at the date of the grant. The Company recognizes stock-based compensation expense for these awards over the vesting period, using the straight-line method, based upon the number of awards ultimately expected to vest. Each restricted stock unit entitles the recipient to receive one share of stock on the vesting date. Generally, for employee awards, the restricted stock units vest 25% per year over four years, with the first vesting date being the one-year anniversary of the grant date, or 100% upon the death or disability of the recipient, or upon change of control (as defined in the Plan) of the Company. Beginning with the awards granted with an effective date of May 15, 2013, the restricted stock units awarded to directors vest 100% one year from the date of the award. Director awards made prior to May 15, 2013 generally vest 25% per year over four years. If a participant terminates employment or service prior to the end of the continuous service period, the unearned portion of the stock unit award may be forfeited, at the discretion of the Company’s Compensation Committee. The Company may also issue awards that vest upon satisfaction of specified performance criteria. For these types of awards, the final measure of compensation cost is based upon the number of shares that ultimately vest considering the performance criteria.
	The following is a summary of nonvested restricted stock unit activity for the year ended December 31, 2014:
				Weighted-
				Average
				Grant-Date
		Shares		Fair Value
	Nonvested at December 31, 2013	52,397		$	18.24
	Granted	26,100		24.61
	Vested	(27,491	)	17.02
	Forfeited	(200	)	19.1
	Nonvested at December 31, 2014	50,806		$	22.17
	The fair value of restricted stock unit awards that vested during 2014 was $792,000, compared to $533,000 and $324,000 during the years ended December 31, 2013 and 2012, respectively. As of December 31, 2014, the total compensation costs related to nonvested restricted stock units that have not yet been recognized totaled $740,000, and the weighted average period over which these costs are expected to be recognized is approximately 2.4 years.
	Value Information:
	The risk-free interest rate assumption is based upon observed interest rates for the expected term of the Company’s stock options. The expected volatility input into the model takes into account the historical volatility of the Company’s stock over the period that it has been publicly traded or the expected term of the option. The expected dividend yield assumption is based upon the Company’s historical dividend payout determined at the date of grant, if any.

Earnings_per_Common_Share

Earnings per Common Share	12 Months Ended
	Dec. 31, 2014
Earnings per Common Share [Abstract]
Earnings Per Share Disclosure [Text Block]	Earnings per Common Share
	Basic per-share amounts are computed by dividing net income (the numerator) by the weighted-average number of common shares outstanding (the denominator). Diluted per share amounts assume issuance of all common stock issuable upon conversion or exercise of other securities, unless the effect is to reduce the loss or increase the income per common share from continuing operations.
	Following are the calculations for basic and diluted earnings per common share:
		Year Ended December 31,
		2014		2013		2012
	(dollars in thousands, except per share amounts)
	Basic earnings per common share computation
	Numerator:
	Net income	$	18,522	$	18,607	$	16,534
	Denominator:
	Weighted average shares outstanding	8,405,284		8,477,904		8,485,008
	Basic earnings per common share	$	2.2	$	2.19	$	1.95
	Diluted earnings per common share computation
	Numerator:
	Net income	$	18,522	$	18,607	$	16,534
	Denominator:
	Weighted average shares outstanding, included all dilutive potential shares	8,433,296		8,525,119		8,527,544
	Diluted earnings per common share	$	2.19	$	2.18	$	1.94

Regulatory_Capital_Requirement

Regulatory Capital Requirements and Restrictions on Subsidiary Cash	12 Months Ended
	Dec. 31, 2014
Regulatory Capital Requirements and Restrictions on Subsidiary Cash [Abstract]
Regulatory Capital Requirements under Banking Regulations [Text Block]	Regulatory Capital Requirements and Restrictions on Subsidiary Cash
	The Company (on a consolidated basis) and the Bank are subject to various regulatory capital requirements administered by the federal banking agencies. Failure to meet minimum capital requirements can initiate certain mandatory and possibly additional discretionary actions by regulators that, if undertaken, could have a direct material effect on the Company’s and the Bank’s financial statements. Under capital adequacy guidelines and the regulatory framework for prompt corrective action, the Company and the Bank must meet specific capital guidelines that involve quantitative measures of their assets, liabilities and certain off-balance-sheet items as calculated under regulatory accounting practices. The capital amounts and classifications are also subject to qualitative judgments by the regulators about components, risk weightings and other factors. Prompt corrective action provisions are not applicable to bank holding companies. With the implementation of the Basel III Rules, which became effective on January 1, 2015, these capital requirements and the related prompt corrective action provisions, have increased. Based on the Company’s assessment of these new regulations, as of December 31, 2014, the Company and the Bank met the requirements necessary to be classified as well-capitalized under the new regulations.
	Quantitative measures established by the regulations in effect on December 31, 2014, to ensure capital adequacy require the Company and the Bank to maintain minimum amounts and ratios (set forth in the table below) of total and Tier 1 capital (as defined in the regulations) to risk-weighted assets (as defined) and of Tier 1 capital (as defined) to average assets (as defined). Management believes, as of December 31, 2014 and 2013, that the Company and the Bank met all capital adequacy requirements to which they were subject.
	As of December 31, 2014, the most recent notification from the Federal Deposit Insurance Corporation categorized the Bank as well capitalized under the regulatory framework for prompt corrective action then in effect. To be categorized as well capitalized under those requirements, an institution had to maintain minimum total risk-based, Tier 1 risk-based and Tier 1 leverage ratios as set forth in the table below. There are no conditions or events since the notification that management believes have changed the Bank’s category, and management believes that the Bank will still be well capitalized under the revised requirements of Basel III. Notwithstanding its compliance with the specified regulatory thresholds, however, the Bank’s board of directors, subsequent to December 31, 2008, adopted a capital policy pursuant to which it will maintain a ratio of Tier 1 capital to total assets of 8% or greater, which ratio is greater than the ratio required to be well capitalized under the regulatory framework for prompt corrective action. This capital policy also provides that the Bank will maintain a ratio of total capital to total risk-weighted assets of at least 10%, which is equal to the threshold for being well capitalized under the regulatory framework for prompt corrective action.
	A comparison of the Company’s and the Bank’s capital with the corresponding minimum regulatory requirements in effect as of December 31, 2014, is presented below:
		Actual				For Capital Adequacy Purposes				To Be Well Capitalized Under Prompt Corrective Action Provisions
		Amount		Ratio		Amount		Ratio		Amount		Ratio
	(dollars in thousands)
	At December 31, 2014:
	Consolidated:
	Total capital/risk based	$	212,559	14.73	%	$	115,407	8	%	N/A		N/A
	Tier 1 capital/risk based	194,362		13.47		57,703		4		N/A		N/A
	Tier 1 capital/adjusted average	194,362		10.85		71,647		4		N/A		N/A
	MidWestOne Bank:
	Total capital/risk based	$	197,018	13.75	%	$	114,624	8	%	$	143,280	10	%
	Tier 1 capital/risk based	179,098		12.5		57,312		4		85,968		6
	Tier 1 capital/adjusted average	179,098		10.05		71,249		4		89,061		5
	At December 31, 2013:
	Consolidated:
	Total capital/risk based	$	200,714	14.62	%	$	109,812	8	%	N/A		N/A
	Tier 1 capital/risk based	183,361		13.36		54,906		4		N/A		N/A
	Tier 1 capital/adjusted average	183,361		10.55		69,491		4		N/A		N/A
	MidWestOne Bank:
	Total capital/risk based	$	183,646	13.49	%	$	108,903	8	%	$	136,128	10	%
	Tier 1 capital/risk based	166,612		12.24		54,451		4		81,677		6
	Tier 1 capital/adjusted average	166,612		9.65		69,063		4		86,329		5
	The ability of the Company to pay dividends to its shareholders is dependent upon dividends paid by the Bank to the Company. The Bank is subject to certain statutory and regulatory restrictions on the amount of dividends it may pay. In addition, as previously noted, subsequent to December 31, 2008, the Bank’s board of directors adopted a capital policy requiring it to maintain a ratio of Tier 1 capital to total assets of at least 8% and a ratio of total capital to risk-based capital of at least 10%. Maintenance of these ratios also could limit the ability of the Bank to pay dividends to the Company.
	The Bank is required to maintain reserve balances in cash on hand or on deposit with Federal Reserve Banks. Reserve balances totaled $1.8 million and $1.6 million as of December 31, 2014 and 2013, respectively.

Commitments_and_Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2014
Commitments and Contingencies [Abstract]
Commitments and Contingencies Disclosure [Text Block]	Commitments and Contingencies
	Financial instruments with off-balance sheet risk: The Bank 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 balance sheets.
	The Bank uses the same credit policies in making commitments and conditional obligations as it does for on-balance-sheet instruments. A summary of the Bank’s commitments at December 31, 2014 and 2013, is as follows:
		December 31,
		2014		2013
	(in thousands)
	Commitments to extend credit	$	267,036	$	263,887
	Commitments to sell loans	801		357
	Standby letters of credit	3,204		4,491
	Total	$	271,041	$	268,735
	The Bank’s exposure to credit loss in the event of nonperformance by the counterparty to the financial instrument for commitments to extend credit is represented by the contractual amount of those 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. 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 Bank evaluates each customer’s creditworthiness on a case-by-case basis. The amount of collateral obtained, if deemed necessary by the Bank upon extension of credit, is based on management’s credit evaluation of the party. Collateral held varies, but may include accounts receivable, crops, livestock, inventory, property and equipment, residential real estate and income-producing commercial properties.
	Commitments to sell loans are agreements to sell loans held for sale to third parties at an agreed upon price.
	Standby letters of credit are conditional commitments issued by the Bank to guarantee the performance of a customer to a third party. Those guarantees are primarily issued to support public and private borrowing arrangements and, generally, have terms of one year or less. The credit risk involved in issuing letters of credit is essentially the same as that involved in extending loan facilities to customers. The Bank holds collateral, which may include accounts receivable, inventory, property, equipment and income-producing properties, that support those commitments, if deemed necessary. In the event the customer does not perform in accordance with the terms of the agreement with the third party, the Bank would be required to fund the commitment. The maximum potential amount of future payments the Bank could be required to make is represented by the contractual amount shown in the summary above. If the commitment is funded, the Bank would be entitled to seek recovery from the customer. At both December 31, 2014 and 2013, the amount recorded as liabilities for the Bank’s potential obligations under these guarantees was $0.2 million.
	Building commitments: The Bank is party to contractual agreements related to certain major building projects entered into in 2013, with a total original estimated cost of $29.8 million. As of December 31, 2014, an estimated $15.5 million remained to be paid on these contracts. The projects are scheduled for completion in 2016.
	Contingencies: In the normal course of business, the Bank is involved in various legal proceedings. In the opinion of management, any liability resulting from such proceedings would not have a material adverse effect on the accompanying consolidated financial statements.
	Concentrations of credit risk: Substantially all of the Bank’s loans, commitments to extend credit and standby letters of credit have been granted to customers in the Bank’s market areas. Although the loan portfolio of the Bank is diversified, approximately 62% of the loans are real estate loans and approximately 17% are agriculturally related. The concentrations of credit by type of loan are set forth in Note 3. Commitments to extend credit are primarily related to commercial loans and home equity loans. Standby letters of credit were granted primarily to commercial borrowers. Investments in securities issued by state and political subdivisions involve certain governmental entities within Iowa. The carrying value of investment securities of Iowa political subdivisions totaled $135.3 million as of December 31, 2014. No individual municipality exceeded $5.0 million.

Related_Party_Transactions

Related Party Transactions	12 Months Ended
	Dec. 31, 2014
Related Party Transactions [Abstract]
Related Party Transactions Disclosure [Text Block]	Related Party Transactions
	Certain directors of the Company and certain principal officers are customers of, and have banking transactions with, the Bank in the ordinary course of business. Such indebtedness has been incurred on substantially the same terms, including interest rates and collateral, as those prevailing at the time for comparable transactions with unrelated persons.
	The following is an analysis of the changes in the loans to related parties during the years ended December 31, 2014 and 2013:
		Year Ended December 31,
		2014			2013
	(in thousands)
	Balance, beginning	$	22,392		$	21,935
	Net decrease due to change in related parties	(10,275		)	(150		)
	Advances	2,420			2,310
	Collections	(2,882		)	(1,703		)
	Balance, ending	$	11,655		$	22,392
	None of these loans are past due, nonaccrual or restructured to provide a reduction or deferral of interest or principal because of deterioration in the financial position of the borrower. Deposits from these related parties totaled $6.5 million and $7.3 million as of December 31, 2014 and 2013, respectively. Deposits from related parties are accepted subject to the same interest rates and terms as those from nonrelated parties.
	The Company has from time to time engaged Neumann Monson, P.C. (“Neumann Monson”), an architectural services firm headquartered in Iowa City for which Kevin Monson, Chairman of the Company, is President, Managing Partner and majority owner, to perform architectural and design services with respect to the Company's offices. During 2014 and 2013, the Company paid Neumann Monson $315,000 and $2,289,000, respectively, for such services. The engagement of Neumann Monson to provide the services described was reviewed by our Audit Committee, which also monitors the level of services by Neumann Monson on a periodic basis. Apart from the approval and monitoring process involving the Audit Committee, Neumann Monson was retained in the ordinary course of business and the Company believes that such services are provided to the Company on terms no less favorable than those that would have been realized in transactions with unaffiliated parties.

Estimated_Fair_Value_of_Financ

Estimated Fair Value of Financial Instruments and Fair Value Measurements	12 Months Ended
	Dec. 31, 2014
Estimated Fair Value of Financial Instruments and Fair Value Measurements [Abstract]
Fair Value Disclosures [Text Block]	Estimated Fair Value of Financial Instruments and Fair Value Measurements
	Fair value is the price that would be received in selling an asset or paid in transferring a liability in an orderly transaction between market participants. A fair value measurement assumes that the transaction to sell the asset or transfer the liability occurs in the principal market for the asset or liability or, in the absence of a principal market, the most advantageous market for the asset or liability. The price in the principal (or most advantageous) market used to measure the fair value of the asset or liability is not adjusted for transaction costs. An orderly transaction is a transaction that assumes exposure to the market for a period prior to the measurement date to allow for marketing activities that are usual and customary for transactions involving such assets and liabilities; it is not a forced transaction. Market participants are buyers and sellers in the principal market that are (i) independent, (ii) knowledgeable, (iii) able to transact and (iv) willing to transact.
	GAAP requires the use of valuation techniques that are consistent with the market approach, the income approach and/or the cost approach. The market approach uses prices and other relevant information generated by market transactions involving identical or comparable assets and liabilities. The income approach uses valuation techniques to convert future amounts, such as cash flows or earnings, to a single present amount on a discounted basis. The cost approach is based on the amount that currently would be required to replace the service capacity of an asset (replacement cost). Valuation techniques should be consistently applied. Inputs to valuation techniques refer to the assumptions that market participants would use in pricing the asset or liability. Inputs may be observable, meaning those that reflect the assumptions market participants would use in pricing the asset or liability developed based on market data obtained from independent sources, or unobservable, meaning those that reflect the reporting entity’s own assumptions about the assumptions market participants would use in pricing the asset or liability developed based on the best information available in the circumstances. In that regard, GAAP establishes a fair value hierarchy for valuation inputs that gives the highest priority to quoted prices in active markets for identical assets or liabilities and the lowest priority to unobservable inputs. The fair value hierarchy is as follows:
	•	Level 1 Inputs – Unadjusted quoted prices in active markets for identical assets or liabilities that the reporting entity has the ability to access at the measurement date.
	•	Level 2 Inputs – Inputs other than quoted prices included in Level 1 that are observable for the asset or liability, either directly or indirectly. These might include quoted prices for similar assets or liabilities in active markets, quoted prices for identical or similar assets or liabilities in markets that are not active, inputs other than quoted prices that are observable for the asset (such as interest rates, volatilities, prepayment speeds, credit risks, etc.) or inputs that are derived principally from or corroborated by market data by correlation or other means.
	•	Level 3 Inputs – Unobservable inputs for determining the fair values of assets or liabilities that reflect an entity’s own assumptions about the assumptions that market participants would use in pricing the assets or liabilities.
	It is the Company’s policy to maximize the use of observable inputs and minimize the use of unobservable inputs when developing fair value measurements. The Company is required to use observable inputs, to the extent available, in the fair value estimation process unless that data results from forced liquidations or distressed sales. A description of the valuation methodologies used for instruments measured at fair value, as well as the general classification of such instruments pursuant to the valuation hierarchy, is set forth below.
	Valuation methods for instruments measured at fair value on a recurring basis
	Securities Available for Sale - The Company’s investment securities classified as available for sale include: debt securities issued by the U.S. Treasury and other U.S. Government agencies and corporations, debt securities issued by state and political subdivisions, mortgage-backed securities, collateralized mortgage obligations, corporate debt securities, and equity securities. Quoted exchange prices are available for equity securities, which are classified as Level 1. The Company utilizes an independent pricing service to obtain the fair value of debt securities. On a quarterly basis, the Company selects a sample of 30 securities from its primary pricing service and compares them to a secondary independent pricing service to validate value. In addition, the Company periodically reviews the pricing methodology utilized by the primary independent service for reasonableness. Debt securities issued by the U.S. Treasury and other U.S. Government agencies and corporations and mortgage-backed obligations are priced utilizing industry-standard models that consider various assumptions, including time value, yield curves, volatility factors, prepayment speeds, default rates, loss severity, current market and contractual prices for the underlying financial instruments, as well as other relevant economic measures. Substantially all of these assumptions are observable in the marketplace, can be derived from observable data, or are supported by observable levels at which transactions are executed in the marketplace and are classified as Level 2. Municipal securities are valued using a type of matrix, or grid, pricing in which securities are benchmarked against the treasury rate based on credit rating. These model and matrix measurements are classified as Level 2 in the fair value hierarchy. On an annual basis, a group of selected municipal securities are priced by a securities dealer and that price is used to verify the primary independent service’s valuation.
	The Company classified its pooled trust preferred CDOs as Level 3 until such securities were sold in the first quarter of 2014. The portfolio consisted of five investments in CDOs backed by pools of trust preferred securities issued by financial institutions and insurance companies. The Company had determined that the observable market data associated with these assets did not represent orderly transactions and reflected forced liquidations or distressed sales. Based on the lack of observable market data, the Company estimated fair value based on the observable data available and reasonable unobservable market data. The Company estimated fair value based on a discounted cash flow model which used appropriately adjusted discount rates reflecting credit and liquidity risks.
	Mortgage Servicing Rights - The Company recognizes the rights to service mortgage loans for others on residential real estate loans internally originated and then sold. Mortgage servicing rights are recorded at fair value based on assumptions through a third-party valuation service. The valuation model incorporates assumptions that market participants would use in estimating future net servicing income, such as the servicing cost per loan, the discount rate, the escrow float rate, an inflation rate, ancillary income, prepayment speeds and default rates and losses. Because many of these inputs are unobservable, the valuations are classified as Level 3.
	The following table summarizes assets measured at fair value on a recurring basis as of December 31, 2014 and 2013. There were no liabilities subject to fair value measurement on a recurring basis as of these dates. The assets are segregated by the level of valuation inputs within the fair value hierarchy utilized to measure fair value:
		Fair Value Measurement at December 31, 2014 Using
	(in thousands)	Total				Quoted Prices in				Significant Other				Significant
						Active Markets for				Observable				Unobservable
						Identical Assets				Inputs				Inputs
						(Level 1)				(Level 2)				(Level 3)
	Assets:
	Available for sale debt securities:
	U.S. Government agencies and corporations	$	49,375			$	—			$	49,375			$	—
	State and political subdivisions	195,199				—				195,199				—
	Mortgage-backed securities	32,463				—				32,463				—
	Collateralized mortgage obligations	146,132				—				146,132				—
	Corporate debt securities	48,741				—				48,741				—
	Total available for sale debt securities	471,910				—				471,910				—
	Other equity securities	3,032				3,032				—				—
	Total securities available for sale	$	474,942			$	3,032			$	471,910			$	—
	Mortgage servicing rights	$	2,308			$	—			$	—			$	2,308
		Fair Value Measurement at December 31, 2013 Using
	(in thousands)	Total				Quoted Prices in				Significant				Significant
						Active Markets for				Other				Unobservable
						Identical Assets				Observable				Inputs
						(Level 1)				Inputs				(Level 3)
										(Level 2)
	Assets:
	Available for sale debt securities:
	U.S. Government agencies and corporations	$	44,939			$	—			$	44,939			$	—
	State and political subdivisions	210,796				—				210,796				—
	Mortgage-backed securities	39,285				—				39,285				—
	Collateralized mortgage obligations	169,223				—				169,223				—
	Corporate debt securities	29,944				—				29,944				—
	Collateralized debt obligations	1,317				—				—				1,317
	Total available for sale debt securities	495,504				—				494,187				1,317
	Other equity securities	3,057				3,057				—				—
	Total securities available for sale	$	498,561			$	3,057			$	494,187			$	1,317
	Mortgage servicing rights	$	2,298			$	—			$	—			$	2,298
	There were no transfers of assets between levels of the fair value hierarchy during the years ended December 31, 2014 and 2013.
	There have been no changes in valuation techniques used for any assets measured at fair value during the year ended December 31, 2014.
	The following table presents additional information about assets measured at fair market value on a recurring basis for which the Company has utilized Level 3 inputs to determine fair value for the years ended December 31, 2014 and 2013:
			For the Years Ended December 31,
			2014								2013
			Collateralized				Mortgage				Collateralized				Mortgage
			Debt				Servicing				Debt				Servicing
			Obligations				Rights				Obligations				Rights
	(in thousands)
	Beginning balance		$	1,317			$	2,298			$	755			$	1,484
	Transfers into Level 3		—				—				—				—
	Transfers out of Level 3		—				—				—				—
	Total gains (losses):
	Included in earnings		782				(243		)		(18		)		293
	Included in other comprehensive income		794				—				822				—
	Purchases, issuances, sales, and settlements:
	Purchases		—				—				—				—
	Issuances		—				253				—				521
Sales		(2,893		)		—				—				—
Settlements		—				—				(242		)		—
Ending Balance		$	—			$	2,308			$	1,317			$	2,298
In December 2013 the Company was notified by the trustee of one of the collateralized debt obligations it owns that the security was in the process of being liquidated. The Company recorded a receivable for the expected amount of the liquidation payment and wrote-off the book value of the security. The remaining five CDOs were sold in the first quarter of 2014 at a net gain of $0.8 million.
The following table presents the amount of gains and losses on Level 3 assets noted above which were included in earnings and other comprehensive income for the years ended December 31, 2014 and 2013 that are attributable to the change in unrealized gains and losses relating to those assets still held, and the line item in the consolidated financial statements in which they are included:
		For the Years Ended December 31,
		2014								2013
		Collateralized				Mortgage				Collateralized				Mortgage
		Debt				Servicing				Debt				Servicing
		Obligations				Rights				Obligations				Rights
(in thousands)
Total gains (losses) for the period in earnings*		$	—			$	10			$	(18	)		$	814
Change in unrealized losses for the period included in other comprehensive income		—				—				822				—
* Losses on collateralized debt obligations are included in gain on sale or call of available for sale securities, while gains on mortgage servicing rights are included in mortgage origination and loan servicing fees, both in the consolidated statements of operations.
Changes in the fair value of available-for-sale securities are included in other comprehensive income to the extent the changes are not considered OTTI. OTTI tests are performed on a quarterly basis and any decline in the fair value of an individual security below its cost that is deemed to be other than temporary results in a write-down that is reflected directly in the Company’s consolidated statements of operations.
Valuation methods for instruments measured at fair value on a nonrecurring basis
Collateral Dependent Impaired Loans - From time to time, a loan is considered impaired and an allowance for credit losses is established. The specific reserves for collateral dependent impaired loans are based on the fair value of the collateral less estimated costs to sell. The fair value of collateral is determined based on appraisals. In some cases, adjustments are made to the appraised values due to various factors, including age of the appraisal, age of comparables included in the appraisal, and known changes in the market and in the collateral. Because many of these inputs are unobservable, the valuations are classified as Level 3.
Other Real Estate Owned (“OREO”) - OREO represents property acquired through foreclosures and settlements of loans. Property acquired through or in lieu of foreclosure are initially recorded at fair value less estimated selling cost at the date of foreclosure, establishing a new cost basis. The Company considers third party appraisals as well as independent fair value assessments from real estate brokers or persons involved in selling OREO in determining the fair value of particular properties. Accordingly, the valuation of OREO is subject to significant external and internal judgment. The Company also periodically reviews OREO to determine whether the property continues to be carried at the lower of its recorded book value or fair value of the property, less disposal costs. Because many of these inputs are unobservable, the valuations are classified as Level 3.
The following table discloses the Company’s estimated fair value amounts of its financial instruments recorded at fair value on a nonrecurring basis. It is management’s belief that the fair values presented below are reasonable based on the valuation techniques and data available to the Company as of December 31, 2014 and 2013, as more fully described above.
	Fair Value Measurement at December 31, 2014 Using
(in thousands)	Total			Quoted Prices in			Significant Other			Significant
				Active Markets for			Observable			Unobservable
				Identical Assets			Inputs			Inputs
				(Level 1)			(Level 2)			(Level 3)
Assets:
Collateral dependent impaired loans:
Commercial and industrial	793			—			—			793
Commercial real estate:
Construction and development	49			—			—			49
Farmland	52			—			—			52
Commercial real estate-other	1,012			—			—			1,012
Total commercial real estate	1,113			—			—			1,113
Residential real estate:
One- to four- family first liens	1,427			—			—			1,427
One- to four- family junior liens	47			—			—			47
Total residential real estate	1,474			—			—			1,474
Consumer	32			—			—			32
Collateral dependent impaired loans	3,412			—			—			3,412
Other real estate owned	1,916			—			—			1,916
	Fair Value Measurement at December 31, 2013 Using
(in thousands)	Total			Quoted Prices in			Significant Other			Significant
				Active Markets for			Observable			Unobservable
				Identical Assets			Inputs			Inputs
				(Level 1)			(Level 2)			(Level 3)
Assets:
Collateral dependent impaired loans:
Commercial and industrial	1,043			—			—			1,043
Commercial real estate:
Construction and development	136			—			—			136
Farmland	65			—			—			65
Commercial real estate-other	1,786			—			—			1,786
Total commercial real estate	1,987			—			—			1,987
Residential real estate:
One- to four- family first liens	186			—			—			186
One- to four- family junior liens	30			—			—			30
Total residential real estate	216			—			—			216
Consumer	44			—			—			44
Collateral dependent impaired loans	3,290			—			—			3,290
Other real estate owned	1,770			—			—			1,770
The following presents the carrying amount and estimated fair value of the financial instruments held by the Company at December 31, 2014 and 2013. The information presented is subject to change over time based on a variety of factors. The operations of the Company are managed on a going concern basis and not a liquidation basis. As a result, the ultimate value realized from the financial instruments presented could be substantially different when actually recognized over time through the normal course of operations. Additionally, a substantial portion of the Company’s inherent value is the Bank’s capitalization and franchise value. Neither of these components has been given consideration in the presentation of fair values below.
	December 31, 2014
	Carrying				Estimated				Quoted Prices in Active Markets for Identical Assets (Level 1)				Significant Other Observable Inputs (Level 2)			Significant Unobservable Inputs
	Amount				Fair Value											(Level 3)
(in thousands)
Financial assets:
Cash and cash equivalents	$	23,409			$	23,409			$	23,409			$	—		$	—
Investment securities:
Available for sale	474,942				474,942				3,032				471,910			—
Held to maturity	51,524				51,253				—				51,253			—
Total investment securities	526,466				526,195				3,032				523,163			—
Loans held for sale	801				812				—				—			812
Loans, net:
Agricultural	103,193				102,927				—				—			102,927
Commercial and industrial	297,048				295,886				—				—			295,886
Credit cards	1,206				1,206				—				—			1,206
Overdrafts	610				610				—				—			610
Commercial real estate:
Construction and development	58,665				58,764				—				—			58,764
Farmland	82,888				83,285				—				—			83,285
Multifamily	54,516				54,356				—				—			54,356
Commercial real estate-other	225,605				225,899				—				—			225,899
Total commercial real estate	421,674				422,304				—				—			422,304
Residential real estate:
One- to four- family first liens	216,338				216,326				—				—			216,326
One- to four- family junior liens	52,821				53,664				—				—			53,664
Total residential real estate	269,159				269,990				—				—			269,990
Consumer	23,266				23,362				—				—			23,362
Total loans, net	1,116,156				1,116,285				—				—			1,116,285
Loan pool participations, net	19,332				19,332				—				—			19,332
Accrued interest receivable	10,898				10,898				10,898				—			—
Federal Home Loan Bank stock	8,582				8,582				—				8,582			—
Mortgage servicing rights	2,308				2,308				—				—			2,308
Financial liabilities:
Deposits:
Non-interest-bearing demand	214,461				214,461				214,461				—			—
Interest-bearing checking	618,540				618,540				618,540				—			—
Savings	102,527				102,527				102,527				—			—
Certificates of deposit under $100,000	235,395				235,401				—				235,401			—
Certificates of deposit $100,000 and over	237,619				238,480				—				238,480			—
Total deposits	1,408,542				1,409,409				935,528				473,881			—
Federal funds purchased and securities sold under agreements to repurchase	78,229				78,229				78,229				—			—
Federal Home Loan Bank borrowings	93,000				93,051				—				—			93,051
Long-term debt	15,464				10,021				—				—			10,021
Accrued interest payable	863				863				863				—			—
	December 31, 2013
	Carrying				Estimated				Quoted Prices in Active Markets for Identical Assets (Level 1)				Significant Other Observable Inputs (Level 2)			Significant Unobservable Inputs
	Amount				Fair Value											(Level 3)
(in thousands)
Financial assets:
Cash and cash equivalents	$	24,890			$	24,890			$	24,890			$	—		$	—
Investment securities:
Available for sale	498,561				498,561				3,057				494,187			1,317
Held to maturity	32,625				30,191				—				30,191			—
Total investment securities	531,186				528,752				3,057				524,378			1,317
Loans held for sale	357				367				—				—			367
Loans, net:
Agricultural	95,712				95,609				—				—			95,609
Commercial and industrial	257,153				256,257				—				—			256,257
Credit cards	998				998				—				—			998
Overdrafts	415				415				—				—			415
Commercial real estate:
Construction and development	71,433				71,569				—				—			71,569
Farmland	84,387				85,058				—				—			85,058
Multifamily	54,883				54,953				—				—			54,953
Commercial real estate-other	217,993				219,213				—				—			219,213
Total commercial real estate	428,696				430,793				—				—			430,793
Residential real estate:
One- to four- family first liens	217,765				218,257				—				—			218,257
One- to four- family junior liens	52,903				53,798				—				—			53,798
Total residential real estate	270,668				272,055				—				—			272,055
Consumer	18,591				18,638				—				—			18,638
Total loans, net	1,072,233				1,074,765				—				—			1,074,765
Loan pool participations, net	25,533				25,533				—				—			25,533
Accrued interest receivable	10,409				10,409				10,409				—			—
Federal Home Loan Bank stock	9,226				9,226				—				9,226			—
Financial liabilities:
Deposits:
Non-interest bearing demand	222,359				222,359				222,359				—			—
Interest-bearing checking	592,673				592,673				592,673				—			—
Savings	94,559				94,559				94,559				—			—
Certificates of deposit under $100,000	256,283				256,549				—				256,549			—
Certificates of deposit $100,000 and over	209,068				209,543				—				209,543			—
Total deposits	1,374,942				1,375,683				909,591				466,092			—
Federal funds purchased and securities sold under agreements to repurchase	66,665				66,665				66,665				—			—
Federal Home Loan Bank borrowings	106,900				107,356				—				—			107,356
Long-term debt	15,464				9,872				—				—			9,872
Accrued interest payable	765				765				765				—			—
•	Cash and cash equivalents, federal funds purchased, securities sold under repurchase agreements, and accrued interest are instruments with carrying values that approximate fair value.
•	Investment securities available for sale are measured at fair value on a recurring basis. Held to maturity securities are carried at amortized cost. Fair value is based upon quoted prices, if available. If a quoted price is not available, the fair value is obtained from benchmarking the security against similar securities by using a third-party pricing service.
•	Loans held for sale are carried at the lower of cost or fair value, with fair value being based on recent observable loan sales. The portfolio has historically consisted primarily of residential real estate loans.
•	For variable-rate loans that reprice frequently and with no significant change in credit risk, fair values are based on carrying values. The fair values for other loans are determined using estimated future cash flows, discounted at the interest rates currently being offered for loans with similar terms to borrowers with similar credit quality. The Company does record nonrecurring fair value adjustments to loans to reflect (1) partial write-downs and allowances that are based on the observable market price or appraised value of the collateral or (2) the full charge-off of the loan carrying value.
•	Loan pool participation carrying values represent the discounted price paid by us to acquire our participation interests in the various loan pool participations purchased, which approximates fair value.
•	The fair value of FHLB stock is estimated at its carrying value and redemption price of $100 per share.
•	Deposit liabilities are carried at historical cost. The fair value of demand deposits, savings accounts and certain money market account deposits is the amount payable on demand at the reporting date. The fair value of fixed maturity certificates of deposit is estimated using the rates currently offered for deposits of similar remaining maturities. If the fair value of the fixed maturity certificates of deposit is calculated at less than the carrying amount, the carrying value of these deposits is reported as the fair value.
•	FHLB borrowings and long-term debt are recorded at historical cost. The fair value of these items is estimated using discounted cash flow analysis, based on the Company's current incremental borrowing rates for similar types of borrowing arrangements.
The following presents the valuation technique(s), observable inputs, and quantitative information about the unobservable inputs used for fair value measurements of the financial instruments held by the Company at December 31, 2014, categorized within Level 3 of the fair value hierarchy:
	Quantitative Information About Level 3 Fair Value Measurements
(dollars in thousands)	Fair Value at December 31, 2014			Valuation Techniques(s)		Unobservable Input		Range of Inputs						Weighted Average
Collateral dependent impaired loans:
Commercial and industrial	793			Modified appraised value		Third party appraisal		NM *			NM *			NM *
						Appraisal discount		NM *			NM *			NM *
Construction & development	49			Modified appraised value		Third party appraisal		NM *			NM *			NM *
						Appraisal discount		NM *			NM *			NM *
Farmland	52			Modified appraised value		Third party appraisal		NM *			NM *			NM *
						Appraisal discount		NM *			NM *			NM *
Commercial real estate-other	1,012			Modified appraised value		Third party appraisal		NM *			NM *			NM *
						Appraisal discount		NM *			NM *			NM *
Residential real estate one- to four-	1,427			Modified appraised value		Third party appraisal		NM *			NM *			NM *
family first liens						Appraisal discount		NM *			NM *			NM *
Residential real estate one- to four-	47			Modified appraised value		Third party appraisal		NM *			NM *			NM *
family junior liens						Appraisal discount		NM *			NM *			NM *
Consumer	32			Modified appraised value		Third party appraisal		NM *			NM *			NM *
						Appraisal discount		NM *			NM *			NM *
Mortgage servicing rights	2,308			Discounted cash flows		Constant prepayment rate		7.49	%		15.24	%		8.64	%
						Pretax discount rate		10	%		13	%		10.16	%
Other real estate owned	1,916			Modified appraised value		Third party appraisal		NM *			NM *			NM *
						Appraisal discount		NM *			NM *			NM *
* Not Meaningful. Third party appraisals are obtained as to the value of the underlying asset, but disclosure of this information would not provide meaningful information, as the range will vary widely from loan to loan. Types of discounts considered include age of the appraisal, local market conditions, current condition of the property, and estimated sales costs. These discounts will also vary from loan to loan, thus providing a range would not be meaningful.
Changes in assumptions or estimation methodologies may have a material effect on these estimated fair values.

Variable_Interest_Entities

Variable Interest Entities	12 Months Ended
	Dec. 31, 2014
Variable Interest Entities [Abstract]
Variable Interest Entity [Text Block]	Variable Interest Entities
	The Company has invested in certain participation certificates of loan pools which are purchased, held and serviced by the third-party independent servicing corporation. The Company’s portfolio holds approximately 95% of participation interests in the pools of loans owned and serviced by States Resources Corporation (“SRC”), a third-party loan servicing organization in Omaha, Nebraska, in which the Company participates. SRC’s owner holds the remaining interest. The Company does not have any ownership interest in or exert any control over SRC, and thus it is not included in the consolidated financial statements.
	These pools of loans were purchased from large nonaffiliated banking organizations and from the FDIC acting as receiver of failed banks and savings associations. As loan pools were put out for bid (generally in a sealed bid auction), SRC’s due diligence teams evaluated the loans and determined their interest in bidding on the pool. After the due diligence, the Company’s management reviewed this information and decided if it wished to continue in the process. If the decision to consider a bid was made, SRC conducted additional analysis to determine the appropriate bid price. This analysis involved discounting loan cash flows with adjustments made for expected losses and changes in collateral values as well as targeted rates of return. A cost or investment basis was assigned to each individual loan on a cents-per-dollar (discounted price) basis based on SRC’s assessment of the recovery potential of each loan.
	Once a bid was awarded to SRC, the Company assumed the risk of profit or loss but on a non-recourse basis so the risk is limited to its initial investment. The extent of the risk is also dependent upon: the debtor or guarantor’s financial condition, the possibility that a debtor or guarantor may file for bankruptcy protection, SRC’s ability to locate any collateral and obtain possession, the value of such collateral, and the length of time it takes to realize the recovery either through collection procedures, legal process, or resale of the loans after a restructure.
	Loan pool participations are shown on the Company’s consolidated balance sheets as a separate asset category. The original carrying value or investment basis of loan pool participations is the discounted price paid by the Company to acquire its interests, which, as noted, is less than the face amount of the underlying loans. The Company’s investment basis is reduced as SRC recovers principal on the loans and remits its share to the Company or as loan balances are written off as uncollectible.

Proposed_Merger_Notes

Proposed Merger (Notes)	12 Months Ended
	Dec. 31, 2014
Business Combinations [Abstract]
Proposed Merger [Text Block]	Proposed Merger
	On November 20, 2014, the Company entered into merger agreement with Central Bancshares, Inc. ("Central"), a Minnesota corporation, pursuant to which Central will merge with and into the Company. In connection with the merger, Central Bank, a Minnesota-chartered commercial bank and wholly-owned subsidiary of Central, will become a wholly-owned subsidiary of the Company. The merger is contingent upon the approval of the Company’s shareholders, regulators and certain customary closing conditions. The corporate headquarters of the combined company will be in Iowa City, Iowa.
	Simultaneously with the execution of the merger agreement, the Company entered into a Shareholder Agreement with the John M. Morrison Revocable Trust #4, the holder of all of the outstanding shares of Central common stock, CBS LLC , the holder of all outstanding preferred securities of CBI Capital Trust III, Riverbank Insurance Center, Inc., the holder of all outstanding Class A units of Central Insurance Agency, LLC and John M. Morrison, an individual with common control over the above named entities. The merger is anticipated to be completed in the second quarter of 2015.
	Subject to the terms and conditions of the merger agreement, each share of common stock of Central will automatically be converted into the right to receive a pro rata portion of (i) 2,723,083 shares of common stock of the Company and (ii) $64.0 million in cash, subject to certain adjustments as described in the merger agreement.
	For further information, please refer to the Current Report on Form 8-K filed by the Company with the SEC on November 21, 2014.

Parent_Company_Only_Financial_

Parent Company Only Financial Information	12 Months Ended
	Dec. 31, 2014
Parent Company Only Financial Information [Abstract]
Condensed Financial Information of Parent Company Only Disclosure [Text Block]	Parent Company Only Financial Information
	The following is condensed financial information of MidWestOne Financial Group, Inc. as of December 31, 2014 and 2013 (parent company only):
		As of December 31,
		2014			2013
	(in thousands)
	Balance Sheets
	Assets:
	Cash	$	5,942		$	5,781
	Investment in subsidiaries	193,600			177,190
	Marketable equity securities, available for sale	2,066			2,111
	Loan pool participations, net	1,964			3,409
	Income tax receivable	—			75
	Deferred income taxes	425			729
	Other assets	5,010			4,447
	Total assets	$	209,007		$	193,742
	Liabilities and Shareholders’ Equity
	Liabilities:
	Long-term debt	$	15,464		$	15,464
	Other liabilities	812			262
	Total liabilities	16,276			15,726
	Shareholders’ equity:
	Capital stock, preferred	—			—
	Capital stock, common	8,690			8,690
	Additional paid-in capital	80,537			80,506
	Treasury stock	(6,945		)	(3,702		)
	Retained earnings	105,127			91,473
	Accumulated other comprehensive income	5,322			1,049
	Total shareholders’ equity	192,731			178,016
	Total liabilities and shareholders’ equity	$	209,007		$	193,742
	The following is condensed financial information of MidWestOne Financial Group, Inc. as of December 31, 2014, 2013, and 2012 (parent company only):
		Year Ended December 31,
		2014			2013			2012
	(in thousands)
	Statements of Income
	Dividends received from subsidiaries	$	8,500		$	4,006		$	5,520
	Interest income and dividends on marketable equity securities	49			33			168
	Interest and discount on loan pool participations	(293		)	(940		)	(2,149		)
	Investment securities gains	—			—			381
	Interest on long-term debt	(281		)	(296		)	(656		)
	Operating expenses	(2,351		)	(1,034		)	(1,064		)
	Income before income taxes and equity in subsidiaries’ undistributed income	5,624			1,769			2,200
	Income tax benefit	(807		)	(890		)	(1,355		)
	Income before equity in subsidiaries’ undistributed income	6,431			2,659			3,555
	Equity in subsidiaries’ undistributed income	12,091			15,948			12,979
	Net income	$	18,522		$	18,607		$	16,534
	The following is condensed financial information of MidWestOne Financial Group, Inc. as of December 31, 2014, 2013, and 2012 (parent company only):
		Year Ended December 31,
		2014			2013			2012
	(in thousands)
	Statements of Cash Flows
	Cash flows from operating activities:
	Net income	$	18,522		$	18,607		$	16,534
	Adjustments to reconcile net income to net cash provided by operating activities:
	Undistributed (earnings) loss of subsidiaries, net of dividends and distributions	(12,091		)	(15,948		)	(12,979		)
	Deferred income taxes	330			(583		)	(106		)
	Investment securities gain	—			—			(381		)
	Stock based compensation	493			384			266
	Increase in other assets	(488		)	(232		)	(158		)
	Increase (decrease) in other liabilities	550			(15		)	4
	Net cash provided by operating activities	7,316			2,213			3,180
	Cash flows from investing activities
	Proceeds from sales of investment securities	2			2			1,131
	Purchase of investment securities	(29		)	(24		)	(1,192		)
	Loan participation pools, net	1,445			2,719			5,834
Net cash provided by investing activities	1,418			2,697			5,773
Cash flows from financing activities:
Stock options exercised	282			320			590
Repurchase of common stock	(3,987		)	(967		)	(1,810		)
Dividends paid	(4,868		)	(4,259		)	(3,054		)
Net cash used in financing activities	(8,573		)	(4,906		)	(4,274		)
Increase in cash	161			4			4,679
Cash Balance:
Beginning	5,781			5,777			1,098
Ending	$	5,942		$	5,781		$	5,777

Segment_Reporting

Segment Reporting	12 Months Ended
	Dec. 31, 2014
Segment Reporting [Abstract]
Segment Reporting Disclosure [Text Block]	Segment Reporting
	The Company’s activities are considered to be a single industry segment for financial reporting purposes. The Company is engaged in the business of commercial and retail banking, investment management and insurance services with operations throughout central and eastern Iowa. Substantially all income is derived from a diverse base of commercial, mortgage and retail lending activities, loan pools and investments.

Subsequent_Events

Subsequent Events	12 Months Ended
	Dec. 31, 2014
Subsequent Events [Abstract]
Subsequent Events [Text Block]	Subsequent Events
	Management evaluated subsequent events through the date the consolidated financial statements were issued. Events or transactions occurring after December 31, 2014, but prior to the date the consolidated financial statements were issued, that provided additional evidence about conditions that existed at December 31, 2014 have been recognized in the consolidated financial statements for the period ended December 31, 2014. Events or transactions that provided evidence about conditions that did not exist at December 31, 2014, but arose before the consolidated financial statements were issued, have not been recognized in the consolidated financial statements for the period ended December 31, 2014. Because the merger with Central is not projected to close until the second quarter of 2015, none of the financial statements reflect any information relating to that transaction.
	On January 21, 2015, the board of directors of the Company declared a cash dividend of $0.15 per share payable on March 16, 2015 to shareholders of record as of the close of business on February 27, 2015.

Quarterly_Results_of_Operation

Quarterly Results of Operations (unaudited)	12 Months Ended
	Dec. 31, 2014
Quarterly Results of Operations [Abstract]
Quarterly Financial Information [Text Block]	Quarterly Results of Operations (unaudited)
		Three Months Ended
		31-Dec		30-Sep		30-Jun		31-Mar
	(in thousands, except per share amounts)
	2014
	Interest income	$	16,311	$	15,996	$	16,176	$	15,921
	Interest expense	2,407		2,429		2,321		2,394
	Net interest income	13,904		13,567		13,855		13,527
	Provision for loan losses	300		150		300		450
	Noninterest income	3,534		4,006		3,556		4,217
	Noninterest expense	11,563		10,819		10,639		10,392
	Income before income taxes	5,575		6,604		6,472		6,902
	Income tax expense	1,668		1,715		1,719		1,929
	Net income	$	3,907	$	4,889	$	4,753	$	4,973
	Net income per common share - basic	$	0.46	$	0.59	$	0.56	$	0.59
	Net income per common share - diluted	$	0.46	$	0.59	$	0.56	$	0.58
	2013
	Interest income	$	16,020	$	16,116	$	16,768	$	17,190
	Interest expense	2,723		2,851		3,159		3,399
	Net interest income	13,297		13,265		13,609		13,791
	Provision for loan losses	300		250		600		200
	Noninterest income	3,234		3,800		3,713		3,981
	Noninterest expense	10,225		10,283		10,585		10,994
	Income before income taxes	6,006		6,532		6,137		6,578
	Income tax expense	1,584		1,668		1,606		1,788
	Net income	$	4,422	$	4,864	$	4,531	$	4,790
	Net income per common share - basic	$	0.52	$	0.57	$	0.54	$	0.56
	Net income per common share - diluted	$	0.52	$	0.57	$	0.53	$	0.56

Nature_of_Business_and_Signifi

Nature of Business and Significant Accounting Policies Nature of Business (Policies)	12 Months Ended
	Dec. 31, 2014
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Nature of Operations [Text Block]	The Company is a bank holding company registered under the Bank Holding Company Act of 1956 that has elected to be a financial holding company. It is headquartered in Iowa City, Iowa and owns 100% of the outstanding common stock of MidWestOne Bank, Iowa City, and 100% of the common stock of MidWestOne Insurance Services, Inc., Oskaloosa, Iowa. MidWestOne Bank (“MidWestOne Bank” or the “Bank”) is also headquartered in Iowa City, Iowa, and provides services to individuals, businesses, governmental units and institutional customers in central and east-central Iowa. The Bank has office locations in Belle Plaine, Burlington, Cedar Falls, Conrad, Coralville, Davenport, Fairfield, Fort Madison, Melbourne, North English, North Liberty, Oskaloosa, Ottumwa, Parkersburg, Pella, Sigourney, Waterloo and West Liberty, Iowa. MidWestOne Insurance Services, Inc. provides personal and business insurance services in Cedar Falls, Conrad, Melbourne, Oskaloosa, Parkersburg, and Pella, Iowa. The Bank is actively engaged in many areas of commercial banking, including: acceptance of demand, savings and time deposits; making commercial, real estate, agricultural and consumer loans, and other banking services tailored for its individual customers. The Wealth Management area of the Bank administers estates, personal trusts, conservatorships, and pension and profit-sharing accounts along with providing other management services to customers.
	On November 20, 2014, the Company entered into merger agreement with Central Bancshares, Inc. ("Central"), a Minnesota corporation, pursuant to which Central will merge with and into the Company. In connection with the merger, Central Bank, a Minnesota-chartered commercial bank and wholly-owned subsidiary of Central, will become a wholly-owned subsidiary of the Company. The merger agreement also provides that each of the outstanding shares of Central common stock will be converted into the right for each Central shareholder to receive its pro rata share of 2,723,083 shares of Company common stock and $64.0 million in cash. The corporate headquarters of the combined company will be Iowa City, Iowa. The merger is anticipated to be completed in the second quarter of 2015. (See Note 20. “Proposed Merger” for additional information.)

Nature_of_Business_and_Signifi1

Nature of Business and Significant Accounting Policies Presentation of Financial Statements (Policies)	12 Months Ended
	Dec. 31, 2014
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Comparability of Prior Year Financial Data, Policy [Policy Text Block]	Cash receipts and cash payments resulting from acquisitions and sales of loans originated for sale are classified as operating cash flows on a gross basis in the consolidated statements of cash flows.

Nature_of_Business_and_Signifi2

Nature of Business and Significant Accounting Policies Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2014
Accounting Policies [Abstract]
Description of New Accounting Pronouncements Not yet Adopted [Text Block]	In July 2013, the FASB issued Accounting Standards Update No. 2013-11, Income Taxes (Topic 740): Presentation of an Unrecognized Tax Benefit When a Net Operating Loss Carryforward, a Similar Tax Loss, or a Tax Credit Carryforward Exists. The objective of this update is to eliminate the diversity in practice on the financial statement presentation of an unrecognized tax benefit when a net operating loss carryforward, a similar tax loss, or a tax credit carryforward exists. For public entities, the amendments became effective for fiscal years, and interim periods within those years, beginning after December 15, 2013, with early adoption permitted. The adoption of this amendment did not have a material effect on the Company’s consolidated financial statements.
	In January 2014, the FASB issued Accounting Standards Update No. 2014-01, Investments—Equity Method and Joint Ventures (Topic 323): Accounting for Investments in Qualified Affordable Housing Projects. The objective of this update is to provide guidance on accounting for investments by a reporting entity in flow-through limited liability entities that manage or invest in affordable housing projects that qualify for the low-income housing tax credit. The low-income housing tax credit program is designed to encourage private capital investment in the construction and rehabilitation of low-income housing. This program is an indirect tax subsidy that allows investors in a flow-through limited liability entity, such as limited partnerships or limited liability companies that manage or invest in qualified affordable housing projects, to receive the benefits of the tax credits allocated to the entity that owns the qualified affordable housing project. The tax credits are allowable on the tax return each year over a 10-year period as a result of a sufficient number of units being rented to qualifying tenants and are subject to restrictions on gross rentals paid by those tenants. Those credits are subject to recapture over a 15-year period starting with the first year tax credits are earned. The amendments in this update permit reporting entities to make an accounting policy election to account for their investments in qualified affordable housing projects using the proportional amortization method if certain conditions are met. For public entities, the amendments are to be applied retrospectively to all annual periods and interim reporting periods presented within those annual periods, beginning after December 15, 2014. The adoption of this amendment is not expected to have a material effect on the Company’s consolidated financial statements.
	In January 2014, the FASB issued Accounting Standards Update No. 2014-04, Receivables—Troubled Debt Restructurings by Creditors (Subtopic 310-40): Reclassification of Residential Real Estate Collateralized Consumer Mortgage Loans upon Foreclosure. The objective of this update is to reduce diversity by clarifying when an in-substance repossession or foreclosure occurs, that is, when a creditor should be considered to have received physical possession of residential real estate property collateralizing a consumer mortgage loan such that the loan receivable should be derecognized and the real estate property recognized. For public entities, the amendments are effective for reporting periods beginning after December 31, 2014, with early adoption permitted. The adoption of this amendment is not expected to have a material effect on the Company’s consolidated financial statements.
	In May 2014, the FASB issued Accounting Standards Update No. 2014-09, Revenue from Contract with Customers (Topic 606). The guidance in this update affects any entity that either enters into contracts with customers to transfer goods or services or enters into contracts for the transfer of nonfinancial assets unless those contracts are within the scope of other standards (for example, insurance contracts or lease contracts). The core principle of the guidance is that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. To achieve that core principle, an entity should apply the following five steps: 1) identify the contracts(s) with the customer; 2) identify the performance obligations in the contract; 3) determine the transaction price; 4) allocate the transaction price to the performance obligations in the contract; and 5) recognize revenue when (or as) the entity satisfies a performance obligation. The guidance also specifies the accounting for some costs to obtain or fulfill a contract with a customer. For a public entity, the amendments in this update are effective for annual reporting periods beginning after December 15, 2016, including interim periods within that reporting period. Early application is not permitted. The Company is still evaluating the effect of this amendment on the Company’s consolidated financial statements.
	In June 2014, the FASB issued Accounting Standards Update No. 2014-11, Transfers and Servicing (Topic 860): Repurchase-to-Maturity Transactions, Repurchase Financings, and Disclosures. The guidance in this update changes the accounting for repurchase-to-maturity transactions and repurchase financing arrangements. It also requires enhanced disclosures about repurchase agreements and other similar transactions. The accounting changes in this update are effective for public companies for the first interim or annual period beginning after December 15, 2014. In addition, for public companies, the disclosure for certain transactions accounted for as a sale is effective for the first interim or annual period beginning on or after December 15, 2014, and the disclosure for transactions accounted for as secured borrowings is required to be presented for annual periods beginning after December 15, 2014, and interim periods beginning after March 15, 2015. Early application is not permitted. The adoption of this amendment is not expected to have a material effect on the Company’s consolidated financial statements.
	In August 2014, the FASB issued Accounting Standards Update No. 2014-14, Receivables - Troubled Debt Restructurings by Creditors (Subtopic 310-40): Classification of Certain Government-Guaranteed Mortgage Loans upon Foreclosure. This update provides guidance on how to classify and measure certain government-guaranteed mortgage loans upon foreclosure, most commonly those offered by the Federal Housing Administration (FHA) of the U.S. Department of Housing and Urban Development (HUD), and the U.S. Department of Veterans Affairs (VA). The ASU requires that a mortgage loan be derecognized and that a separate other receivable be recognized upon foreclosure if the following conditions are met: 1) the loan has a government guarantee that is not separable from the loan before foreclosure; 2) at the time of foreclosure, the creditor has the intent to convey the real estate property to the guarantor and make a claim on the guarantee, and the creditor has the ability to recover under the claim; and 3) at the time of foreclosure, an amount of the claim that is determined on the basis of the fair value of the real estate is fixed. Upon foreclosure, the separate other receivable should be measured based on the amount of the loan balance (principal and interest) expected to be recovered from the guarantor. The accounting changes in this update are effective for public companies for annual periods, and the interim periods within those annual periods, beginning after December 15, 2014. Early application is permitted under certain circumstances. The adoption of this amendment is not expected to have a material effect on the Company’s consolidated financial statements.
	In August 2014, the FASB issued Accounting Standards Update No. 2014-15, Presentation of Financial Statements - Going Concern (Subtopic 205-40): Disclosure of Uncertainties about an Entity's Ability to Continue as a Going Concern. The amendments in this update provide guidance in GAAP about management's responsibility to evaluate whether there is substantial doubt about an entity's ability to continue as a going concern and to provide related footnote disclosures. In doing so, the amendment should reduce diversity in the timing and content of footnote disclosures. Disclosures are required if it is probable an entity will be unable to meet its obligations within the look-forward period of twelve months after the financial statements are made available. Incremental substantial doubt disclosure is required if the probability is not mitigated by management's plans. The new standard applies to all entities for the first annual period ending after December 15, 2016, and interim periods thereafter. The adoption of this standard is not expected to have a material effect on the Company’s consolidated financial statements.
	In November 2014, the FASB issued Accounting Standards Update No. 2014-17, Business Combinations (Topic 805): Pushdown Accounting. The amendments in this update provide an acquired entity with an option to apply pushdown accounting in its separate financial statements upon occurrence of an event in which an acquirer obtains control of the acquired entity. An acquired entity may elect the option to apply pushdown accounting in the reporting period in which the change-in-control event occurs. If pushdown accounting is not applied in the reporting period in which the change-in-control event occurs, an acquired entity will have the option to elect to apply pushdown accounting in a subsequent reporting period to the acquired entity’s most recent change-in-control event. If pushdown accounting is applied to an individual change-in-control event, that election is irrevocable. The amendments in this Update are effective on November 18, 2014. After the effective date, an acquired entity can make an election to apply the guidance to future change-in-control events or to its most recent change-in-control event. The adoption of this standard did not have a material effect on the Company’s consolidated financial statements.
Use of Estimates, Policy [Policy Text Block]	The preparation of financial statements in conformity with U.S. Generally Accepted Accounting Principles (“GAAP”) requires management to make estimates and assumptions that affect the reported amount of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. The U.S. economic environment in recent years has increased the degree of uncertainty inherent in these estimates.
	Certain significant estimates: The allowance for loan losses and the fair values of investment securities and other financial instruments involve certain significant estimates made by management. These estimates are reviewed by management routinely and it is reasonably possible that circumstances that exist may change in the near-term future and that the effect could be material to the consolidated financial statements.
Consolidation, Policy [Policy Text Block]	The consolidated financial statements include the accounts of MidWestOne Financial Group, Inc., a bank holding company, and its wholly-owned subsidiaries which include MidWestOne Bank, a state chartered bank whose primary federal regulator is the Federal Deposit Insurance Corporation, and MidWestOne Insurance Services, Inc. All significant inter-company accounts and transactions have been eliminated in consolidation.
	Trust assets, other than cash deposits held by the Bank in a fiduciary or agency capacity for its customers, are not included in the accompanying consolidated financial statements because such accounts are not assets of the Bank.
	In the normal course of business, the Company may enter into a transaction with a variable interest entity (“VIE”). VIEs are legal entities whose investors lack the ability to make decisions about the entity’s activities, or whose equity investors do not have the right to receive the residual returns of the entity. The applicable accounting guidance requires the Company to perform ongoing quantitative and qualitative analysis to determine whether it must consolidate any VIE. The Company does not have any ownership interest in or exert any control over any VIE, and thus no VIEs are included in the consolidated financial statements. Investments in non-marketable loan participation certificates for which the Company does not have the ability to exert significant influence are accounted for using the cost method.
Cash and Cash Equivalents, Policy [Policy Text Block]	For purposes of reporting cash flows, cash and due from banks includes cash on hand, amounts due from banks, and federal funds sold. Cash flows from portfolio loans originated by the Bank, deposits, federal funds purchased, and securities sold under agreements to repurchase are reported net.
Marketable Securities, Held-to-maturity Securities, Policy [Policy Text Block]	Certain debt securities that the Company has the positive intent and ability to hold to maturity are classified as held to maturity and recorded at amortized cost. Securities not classified as held to maturity, including equity securities with readily determinable fair values, are classified as available for sale and recorded at fair value, with unrealized gains and losses excluded from earnings and reported in other comprehensive income.
Marketable Securities, Available-for-sale Securities, Policy [Policy Text Block]	The Company carries its investment securities at fair value, and the Company employs valuation techniques which utilize observable inputs when those inputs are available. These observable inputs reflect assumptions market participants would use in pricing the security, developed based on market data obtained from sources independent of the Company. When such information is not available, the Company employs valuation techniques which utilize unobservable inputs, or those which reflect the Company’s own assumptions about assumptions that market participants would use, based on the best information available in the circumstances. These valuation methods typically involve cash flow and other financial modeling techniques. Changes in underlying factors, assumptions, estimates, or other inputs to the valuation techniques could have a material impact on the Company’s future financial condition and results of operations. Fair value measurements are required to be classified as Level 1 (quoted prices), Level 2 (based on observable inputs) or Level 3 (based on unobservable inputs) discussed in more detail in Note 18 to the consolidated financial statements. Available for sale securities are recorded at fair value with unrealized gains and losses excluded from earnings and reported as a separate component of shareholders’ equity until realized.
	Purchase premiums and discounts are recognized in interest income using the interest method over the terms of the securities. Declines in the fair value of held to maturity and available for sale securities below their cost that are deemed to be other than temporary are reflected in earnings as realized losses. In determining whether other than temporary impairment exists, management considers whether: (1) we have the intent to sell the security; (2) it is more likely than not that we will be required to sell the security before recovery of the amortized cost basis; and (3) we do not expect to recover the entire amortized cost basis of the security. Gains and losses on the sale of securities are recorded on the trade date and are determined using the specific identification method.
Finance, Loan and Lease Receivables, Held-for-investment, Policy [Policy Text Block]	Loans are stated at the principal amount outstanding, net of deferred loan fees and costs and allowance for loan losses. Interest on loans is credited to income as earned based on the principal amount outstanding. Deferred loan fees and costs are amortized using the level yield method over the remaining maturities on the loans.
	The accrual of interest on mortgage and commercial loans is discontinued at the time the loan is 90 days past due, unless the credit is well secured and in process of collection. Credit card loans and other personal loans are typically charged off no later than 180 days past due. Past due status is based on contractual terms of the loan. In all cases, loans are placed on nonaccrual or charged off at an earlier date, if collection of principal or interest is considered doubtful.
	All interest accrued but not collected for loans that are placed on nonaccrual or charged off is reversed against interest income. The interest on these loans is accounted for on the cash-basis or cost-recovery method, until qualifying for return to accrual. Loans are returned to accrual status when all the principal and interest amounts contractually due are brought current and future payments are reasonably assured.
Loan Pool Participations [Policy Text Block]	The Company acquired its loan pool participations from the Former MidwestOne during the merger and continued in this business following the merger. However, in 2010, the Company made the decision to exit this line of business and is thus not purchasing new loan pool participations as existing pools pay down. The pools consist of loans to borrowers located throughout the United States.
	The Company carries its investment in the loan pools as a separate earning asset on the consolidated balance sheets. Principal or interest restructures, write-downs, or write-offs within the pools are not included in the Company’s disclosures for its loan portfolio, and foreclosed property from loans associated with the pools is not included in other real estate owned on the consolidated balance sheets. The loan pool participations are managed by a non-affiliate servicer operating in Omaha, Nebraska.
	Each pool has a different composition and different characteristics. The composition of a loan pool is generally determined by the seller based on its desire to maximize the price it receives for all loans among the various pools. Many of the pools consist of loans primarily secured by single-family, multi-family, and small commercial real estate. Some pools may consist of a large number of small consumer loans that are secured by other assets such as automobiles or mobile homes, while other pools may consist of small- to medium-balance commercial loans. Some may contain a mixture of such loans and other types of loans.
	The Company invested in pools consisting of both performing loans and past-due nonperforming loans. The price bid and paid for such a loan pool was determined based on the composition of the particular pool, the amounts the servicer believed could be collected on such a pool, and the risks associated with the collection of such amounts.
	Upon the acquisition of a participation interest in a loan pool, the Company assumed the risk of loss on a pro-rata basis. The extent of such risk is dependent on a number of factors, including the servicer’s ability to locate the debtors, the debtors’ financial condition, the possibility that a debtor may file for protection under applicable bankruptcy laws, the servicer’s ability to locate the collateral, if any, for the loan and to obtain possession of such collateral, the value of such collateral, and the length of time it takes to realize the ultimate recovery either through collection procedures or through a resale of the loans following a restructure.
	A cost “basis” was assigned to each individual loan acquired on a cents-per-dollar (discounted price) basis based on the servicer’s assessment of the recovery potential of each such loan. This methodology assigns a higher basis to performing loans with greater potential collectability and a lower basis to those loans identified as having little or no potential for collection.
	Loan pool participations are shown on the Company’s consolidated balance sheets as a separate asset category. The original carrying value of loan pool participations represents the discounted price paid by the Company to acquire its participation interests in various loan pools purchased by the servicer. The Company’s investment balance is reduced as the servicer collects principal payments on the loans and remits the proportionate share of such payments to the Company, as well as for charge-offs of amounts determined to be uncollectible.
	The loan pool participations acquired are accounted for in accordance with the provisions of ASC Topic 310.
	ASC Topic 310 provides guidance on the accounting for purchased loans that show evidence of deterioration of credit quality since origination and for which it is probable, at acquisition, that the purchaser will be unable to collect all contractually required payments receivable. ASC Topic 310 generally requires that the excess of the estimated cash flows expected to be collected on the loan over the initial investment be accreted over the estimated remaining life of the loan.
	According to ASC Topic 310, in order to apply the interest method of recognition to these types of loans, there must be sufficient information to reasonably estimate the amount and timing of the cash flows expected to be collected. When that is not the case, the loan should be accounted for as a nonaccrual status applying the cash basis income recognition to the loan.
	The Company developed and implemented procedures to determine if accretion of the discount (“accretable yield”) on the purchased loans in a pool is required under ASC Topic 310. Given the impaired nature of the loan pools typically purchased, the individual loans were evaluated for ASC Topic 310 purposes by the end of a six-month window from the date of purchase. This provided time to assess the quality of the loans and assign basis to each loan within the pool. Purchased loans were evaluated individually with a determination made utilizing various criteria including: past-due status, late payments, legal status of the loan (not in foreclosure, judgment against the borrower, or referred to legal counsel), frequency of payments made, collateral adequacy and the borrower’s financial condition. If all the criteria were met, the Company utilized the accounting treatment for that individual loan required by ASC Topic 310 with the accretable yield difference between the expected cash flows and the purchased basis accreted into income on the level yield basis over the anticipated life of the loan. If any of the six criteria were not met, the loan is accounted for on the cash-basis of accounting.
	In the event that a prepayment is received on a loan accounted for under ASC Topic 310, the accretable yield is recomputed and the revised amount accreted over the estimated remaining life of the loan on the level yield basis. If a loan subject to accretable yield under ASC Topic 310 fails to make timely payments, it is subject to classification and an allowance for loss would be established.
	Collection expenses incurred by the servicer are netted against discount income. Discount income is added to interest income and reflected as one amount on the Company’s consolidated statements of operations.
	Interest income is only recognized when collected and actually remitted to the Company by the servicer for those loans subject to nonaccrual status in accordance with ASC Topic 310. Many of the pools that have been purchased by the servicer do not include purchased interest in the cost basis; thus, interest collected does not have a cost basis and represents profit. Interest income collected by the servicer is reflected in the Company’s consolidated financial statements as interest income and is included as part of interest and discount on loan pool participations.
Finance, Loan and Lease Receivables, Held-for-sale, Policy [Policy Text Block]	Loans originated and intended for sale in the secondary market are carried at the lower of aggregate cost or estimated fair value, as determined by aggregate outstanding commitments from investors or current investor yield requirements. Net unrealized losses, if any, are recognized through a valuation allowance by charges to income.
	Mortgage loans held for sale are generally sold with the mortgage servicing rights retained. Gains or losses on sales of mortgage loans are recognized based on the difference between the selling price plus the value of servicing rights, less the carrying value of the related mortgage loans sold.
Loans and Leases Receivable, Allowance for Loan Losses Policy [Policy Text Block]	The allowance for loan losses is established as losses estimated to have been incurred through a provision for loan losses charged to earnings. Loan losses are charged against the allowance when management believes the uncollectibility of a loan balance is confirmed. Subsequent recoveries, if any, are credited to the allowance.
	The allowance for loan losses is evaluated on a quarterly basis by management and is based upon management’s periodic review of the collectiblity of the loans in light of historical experience, the nature and volume of the loan portfolio, adverse situations that may affect the borrower’s ability to repay, estimated value of any underlying collateral and prevailing economic conditions. This evaluation is inherently subjective, as it requires estimates that are susceptible to significant revision as more information becomes available.
	The allowance consists of specific, general and unallocated components. The specific component relates to loans that are classified as doubtful, substandard or special mention. For such loans that are also classified as impaired as well as any loan (regardless of classification) meeting the definition of a troubled debt restructuring, an allowance is established when the discounted cash flows (or collateral value or observable market price) of the impaired loan are lower than the carrying value of that loan. The general component covers loans not classified as impaired and is based on historical loss experience adjusted for qualitative factors. An unallocated component is maintained to cover uncertainties that could affect management’s estimate of probable losses. The unallocated component of the allowance reflects that margin of imprecision inherent in the underlying assumptions used in the methodologies for estimating specific and general losses in the portfolio.
	A loan is considered impaired when, based on current information and events, it is probable that the Bank will be unable to collect the scheduled payments of principal or interest when due according to the contractual terms of the loan agreement. Factors considered by management in determining impairment include: payment status, collateral value and the probability of collecting scheduled principal and interest payments when due. Loans that experience insignificant payment delays and payment shortfalls generally are not classified as impaired. Management determines the significance of payment delays and payment shortfalls on a case-by-case basis, taking into consideration all of the circumstances surrounding the loan and the borrower, including the length of the delay, the reasons for the delay, the borrower’s prior payment record and the amount of the shortfall in relation to the principal and interest owed. Impairment is measured on a loan-by-loan basis by either the present value of expected future cash flows discounted at the loan’s effective interest rate, the loan’s observable market price or the fair value of the collateral, if the loan is collateral dependent.
	Large groups of smaller-balance, homogeneous loans are collectively evaluated for impairment. Accordingly, the Bank generally does not separately identify individual consumer and residential loans for impairment unless they meet the definition of a troubled debt restructure.
	The Allowance for Loan and Lease Losses - Bank Loans
	The Company requires the maintenance of an adequate allowance for loan and lease losses (“ALLL”) in order to cover estimated probable losses without eroding the Company's capital base. Calculations are done at each quarter end, or more frequently if warranted, to analyze the collectability of loans and to ensure the adequacy of the allowance. In line with FDIC directives, the ALLL calculation does not include consideration of loans held for sale or off-balance-sheet credit exposures (such as unfunded letters of credit). Determining the appropriate level for the ALLL relies on the informed judgment of management, and as such, is subject to inaccuracy. Given the inherently imprecise nature of calculating the necessary ALLL, the Company's policy permits an "unallocated" allowance between 15% above and 5% below the “indicated reserve.” These unallocated amounts are due to those overall factors impacting the ALLL that are not captured in detailed loan category calculations.
Transfers and Servicing of Financial Assets, Servicing of Financial Assets, Policy [Policy Text Block]	Revenue from the origination and sale of loans in the secondary market is recognized upon the transfer of financial assets and accounted for as sales when control over the assets has been surrendered. The Bank also sells participation interests in some large loans originated, to non-affiliated entities. Control over transferred assets is deemed to be surrendered when: (1) the assets have been isolated from the Bank and its affiliates; (2) the transferee has the right to pledge or exchange the assets it received and no condition both constrains the transferee from taking advantage of its right to pledge or exchange and provides more than a trivial benefit to the transferor; and (3) the Bank and its affiliates do not maintain effective control over the transferred assets through an agreement to repurchase them before their maturity or the ability to unilaterally cause the holder to return specific assets.
Revenue Recognition, Sales of Services [Policy Text Block]	Trust fees, deposit account service charges and other fees are recognized when payment is received for the services (cash basis), which generally occurs at the time the services are provided.
Off-Balance-Sheet Credit Exposure, Policy [Policy Text Block]	In the ordinary course of business, the Bank has entered into commitments to extend credit, including commitments under credit card arrangements, commercial letters of credit and standby letters of credit. Such financial instruments are recorded when they are funded. The Bank records a liability to the extent losses on its commitments to lend are probable.
Property, Plant and Equipment, Policy [Policy Text Block]	Land is carried at cost. Premises and equipment are stated at cost less accumulated depreciation. The estimated useful lives and primary method of depreciation for the principal items are as follows:
		Years
	Type of Assets	Minimum		Maximum	Depreciation Method
	Buildings and leasehold improvements	10	-	30	Straight-line
	Furniture and equipment	3	-	10	Straight-line
	Charges for maintenance and repairs are expensed as incurred. When assets are retired or disposed of the related cost and accumulated depreciation are removed from the respective accounts and the resulting gain or loss is recorded.
Loans and Leases Receivable, Real Estate Acquired Through Foreclosure, Policy [Policy Text Block]	Real estate properties acquired through or in lieu of foreclosure are initially recorded at fair value less estimated selling cost at the date of foreclosure, establishing a new cost basis. Fair value is determined by management by obtaining appraisals or other market value information at least annually. Any write-downs in value at the date of acquisition are charged to the allowance for loan losses. After foreclosure, valuations are periodically performed by management by obtaining updated appraisals or other market value information. Any subsequent write-downs are recorded as a charge to operations, if necessary, to reduce the carrying value of a property to the updated fair value less estimated selling cost. Net costs related to the holding of properties are included in noninterest expense.
Transfers and Servicing of Financial Assets, Servicing of Financial Assets, Policy [Policy Text Block]	Mortgage servicing rights are recorded at fair value based on assumptions through a third-party valuation service. The valuation model incorporates assumptions that market participants would use in estimating future net servicing income, such as the servicing cost per loan, the discount rate, the escrow float rate, an inflation rate, ancillary income, prepayment speeds and default rates and losses.
Bank Owned Life Insurance [Policy Text Block]	Bank-owned life insurance is carried at cash surrender value, net of surrender and other charges, with increases/decreases reflected as income/expense in the consolidated statements of operations.
Share-based Compensation, Option and Incentive Plans Policy [Policy Text Block]	Compensation expense for share based awards is recorded over the vesting period at the fair value of the award at the time of grant. The exercise price of options or fair value of nonvested shares granted under the Company’s incentive plans is equal to the fair market value of the underlying stock at the grant date. The Company assumes no projected forfeitures on its stock based compensation, since actual historical forfeiture rates on its stock-based incentive awards has been negligible.
Income Tax, Policy [Policy Text Block]	The Company files a consolidated federal income tax return. Income tax expense is generally allocated as if the Company and its subsidiaries file separate income tax returns. For state purposes, the Bank files a franchise tax return and the remaining entities file a consolidated income tax return. Deferred tax assets and liabilities are recognized for the future tax consequences attributable to temporary differences between the financial statement carrying amount of existing assets and liabilities and their respective tax bases. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be recovered or settled. The effect of a change in tax rates on deferred tax assets and liabilities is recognized in income in the period that includes the enactment date. Deferred tax assets are reduced by a valuation allowance when, in the opinion of management, it is more likely than not that some portion or all of the deferred tax assets will not be realized.
	In accordance with ASC 740, Income Taxes, the Company recognizes a tax position as a benefit only if it is more likely than not that the tax position would be sustained in a tax examination, with a tax examination being presumed to occur. The amount recognized is the largest amount of tax benefit that is greater than 50% likely of being realized upon examination. For tax positions not meeting the more likely than not test, no tax benefit is recorded. The Company recognizes interest and/or penalties related to income tax matters in income tax expense.
	There were no material unrecognized tax benefits or any interest or penalties on any unrecognized tax benefits as of December 31, 2014 and 2013.
Treasury Stock [Text Block]	On October 18, 2011, our Board of Directors amended the Company’s then existing share repurchase program by increasing the remaining amount of authorized repurchases to $5.0 million, and extending the expiration of the program to December 31, 2012. We repurchased 57,151 shares of common stock during the fourth quarter of 2011 for an aggregate cost of $840,000. In 2012, we repurchased a total of 104,518 shares of common stock at a cost of $1.8 million.
	On January 15, 2013, the Company's board of directors announced the renewal of the Company's share repurchase program, extending the expiration of the program to December 31, 2014 and increasing the remaining amount of authorized repurchases under the program to $5.0 million from the approximately $2.4 million of authorized repurchases that had previously remained. Pursuant to the program, the Company may continue to repurchase shares from time to time in the open market, and the method, timing and amounts of repurchase will be solely in the discretion of the Company's management. The repurchase program does not require the Company to acquire a specific number of shares. Therefore, the amount of shares repurchased pursuant to the program will depend on several factors, including market conditions, capital and liquidity requirements, and alternative uses for cash available. In 2013, we repurchased 40,713 shares of common stock at a cost of $1.0 million.
	On July 17, 2014, the board of directors of the Company approved a new share repurchase program, allowing for the repurchase of up to $5.0 million of stock through December 31, 2016. The new repurchase program replaced the Company's prior repurchase program, pursuant to which the Company had repurchased approximately $3.7 million of common stock since January 1, 2013. Pursuant to the new program, the Company may continue to repurchase shares from time to time in the open market, and the method, timing and amounts of repurchase will be solely in the discretion of the Company's management. The repurchase program does not require the Company to acquire a specific number of shares. Therefore, the amount of shares repurchased pursuant to the program will depend on several factors, including market conditions, capital and liquidity requirements, and alternative uses for cash available. Of the $5.0 million of stock authorized under the repurchase plan, $3.8 million remained available for possible future repurchases as of December 31, 2014.
Comprehensive Income, Policy [Policy Text Block]	Accounting principles generally require that recognized revenue, expenses, gains and losses be included in net income. Certain changes in assets and liabilities, such as unrealized gains and losses on available-for-sale securities, are reported as a separate component of shareholders’ equity on the consolidated balance sheets, and are disclosed in the consolidated statements of comprehensive income.
	The components of accumulated other comprehensive income, included in shareholders’ equity, net of tax, are as follows:
			Year Ended December 31,
			2014			2013		2012
	(in thousands)
	Unrealized gains on securities available for sale, net of tax		$	5,322		$	1,049	$	11,050
	Accumulated other comprehensive income, net of tax		$	5,322		$	1,049	$	11,050

Loans_Receivable_and_the_Allow1

Loans Receivable and the Allowance for Loan Losses Loans Receivable and the Allowance for Loan Losses (Policies)	12 Months Ended
	Dec. 31, 2014
Loans Receivable and the Allowance for Loan Losses [Abstract]
Financing Receivable, Allowance for Credit Losses, Policy for Uncollectible Amounts	Charge-off Policy
	The Company requires a loan to be charged-off as soon as it becomes apparent that some loss will be incurred, or when its collectability is sufficiently questionable that it no longer is considered a bankable asset. The primary considerations when determining if and how much of a loan should be charged-off are as follows: (1) the potential for future cash flows; (2) the value of any collateral; and (3) the strength of any co-makers or guarantors.
Loans and Leases Receivable, Allowance for Loan Losses Policy [Policy Text Block]	The allowance for loan losses is established as losses estimated to have been incurred through a provision for loan losses charged to earnings. Loan losses are charged against the allowance when management believes the uncollectibility of a loan balance is confirmed. Subsequent recoveries, if any, are credited to the allowance.
	The allowance for loan losses is evaluated on a quarterly basis by management and is based upon management’s periodic review of the collectiblity of the loans in light of historical experience, the nature and volume of the loan portfolio, adverse situations that may affect the borrower’s ability to repay, estimated value of any underlying collateral and prevailing economic conditions. This evaluation is inherently subjective, as it requires estimates that are susceptible to significant revision as more information becomes available.
	The allowance consists of specific, general and unallocated components. The specific component relates to loans that are classified as doubtful, substandard or special mention. For such loans that are also classified as impaired as well as any loan (regardless of classification) meeting the definition of a troubled debt restructuring, an allowance is established when the discounted cash flows (or collateral value or observable market price) of the impaired loan are lower than the carrying value of that loan. The general component covers loans not classified as impaired and is based on historical loss experience adjusted for qualitative factors. An unallocated component is maintained to cover uncertainties that could affect management’s estimate of probable losses. The unallocated component of the allowance reflects that margin of imprecision inherent in the underlying assumptions used in the methodologies for estimating specific and general losses in the portfolio.
	A loan is considered impaired when, based on current information and events, it is probable that the Bank will be unable to collect the scheduled payments of principal or interest when due according to the contractual terms of the loan agreement. Factors considered by management in determining impairment include: payment status, collateral value and the probability of collecting scheduled principal and interest payments when due. Loans that experience insignificant payment delays and payment shortfalls generally are not classified as impaired. Management determines the significance of payment delays and payment shortfalls on a case-by-case basis, taking into consideration all of the circumstances surrounding the loan and the borrower, including the length of the delay, the reasons for the delay, the borrower’s prior payment record and the amount of the shortfall in relation to the principal and interest owed. Impairment is measured on a loan-by-loan basis by either the present value of expected future cash flows discounted at the loan’s effective interest rate, the loan’s observable market price or the fair value of the collateral, if the loan is collateral dependent.
	Large groups of smaller-balance, homogeneous loans are collectively evaluated for impairment. Accordingly, the Bank generally does not separately identify individual consumer and residential loans for impairment unless they meet the definition of a troubled debt restructure.
	The Allowance for Loan and Lease Losses - Bank Loans
	The Company requires the maintenance of an adequate allowance for loan and lease losses (“ALLL”) in order to cover estimated probable losses without eroding the Company's capital base. Calculations are done at each quarter end, or more frequently if warranted, to analyze the collectability of loans and to ensure the adequacy of the allowance. In line with FDIC directives, the ALLL calculation does not include consideration of loans held for sale or off-balance-sheet credit exposures (such as unfunded letters of credit). Determining the appropriate level for the ALLL relies on the informed judgment of management, and as such, is subject to inaccuracy. Given the inherently imprecise nature of calculating the necessary ALLL, the Company's policy permits an "unallocated" allowance between 15% above and 5% below the “indicated reserve.” These unallocated amounts are due to those overall factors impacting the ALLL that are not captured in detailed loan category calculations.

Nature_of_Business_and_Signifi3

Nature of Business and Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2014
Nature of Business and Significant Accounting Policies [Abstract]
Property, Plant and Equipment [Table Text Block]	Land is carried at cost. Premises and equipment are stated at cost less accumulated depreciation. The estimated useful lives and primary method of depreciation for the principal items are as follows:
		Years
	Type of Assets	Minimum		Maximum	Depreciation Method
	Buildings and leasehold improvements	10	-	30	Straight-line
	Furniture and equipment	3	-	10	Straight-line
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]	The components of accumulated other comprehensive income, included in shareholders’ equity, net of tax, are as follows:
			Year Ended December 31,
			2014			2013		2012
	(in thousands)
	Unrealized gains on securities available for sale, net of tax		$	5,322		$	1,049	$	11,050
	Accumulated other comprehensive income, net of tax		$	5,322		$	1,049	$	11,050

Investment_Securities_Tables

Investment Securities (Tables)	12 Months Ended
	Dec. 31, 2014
Investment Securities [Abstract]
Schedule of Available-for-sale Securities Reconciliation [Table Text Block]	The amortized cost and fair value of investment securities available for sale, with gross unrealized gains and losses, are as follows:
						Gross				Gross
		Amortized				Unrealized				Unrealized				Estimated
		Cost				Gains				Losses				Fair Value
	(in thousands)
	December 31, 2014
	U.S. Government agencies and corporations	$	49,392			$	248			$	265			$	49,375
	State and political subdivisions	187,276				8,113				190				195,199
	Mortgage-backed securities	30,965				1,498				—				32,463
	Collateralized mortgage obligations	147,412				813				2,093				146,132
	Collateralized debt obligations	—				—				—				—
	Corporate debt securities	48,656				188				103				48,741
	Total debt securities	463,701				10,860				2,651				471,910
	Other equity securities	2,686				380				34				3,032
	Total investment securities	$	466,387			$	11,240			$	2,685			$	474,942
	December 31, 2013
	U.S. Government agencies and corporations	$	45,279			$	527			$	867			$	44,939
	State and political subdivisions	207,734				5,625				2,563				210,796
	Mortgage-backed securities	37,593				1,692				—				39,285
	Collateralized mortgage obligations	171,714				1,003				3,494				169,223
	Collateralized debt obligations	2,111				190				984				1,317
	Corporate debt securities	29,802				284				142				29,944
	Total debt securities	494,233				9,321				8,050				495,504
	Other equity securities	2,659				453				55				3,057
	Total investment securities	$	496,892			$	9,774			$	8,105			$	498,561
Held-to-maturity Securities [Table Text Block]	The amortized cost and fair value of investment securities held to maturity, with gross unrealized gains and losses, are as follows:
						Gross				Gross
		Amortized				Unrealized				Unrealized				Estimated
		Cost				Gains				Losses				Fair Value
	(in thousands)
	December 31, 2014
	State and political subdivisions	$	39,704			$	370			$	252			$	39,822
	Mortgage-backed securities	22				3				—				25
	Collateralized mortgage obligations	8,531				—				233				8,298
	Corporate debt securities	3,267				—				159				3,108
	Total	$	51,524			$	373			$	644			$	51,253
	December 31, 2013
	State and political subdivisions	$	19,888			$	—			$	1,326			$	18,562
	Mortgage-backed securities	28				3				—				31
	Collateralized mortgage obligations	9,447				—				834				8,613
	Corporate debt securities	3,262				—				277				2,985
	Total	$	32,625			$	3			$	2,437			$	30,191
Schedule of Temporary Impairment Losses, Investments [Table Text Block]	The following presents information pertaining to securities with gross unrealized losses as of December 31, 2014 and 2013, aggregated by investment category and length of time that individual securities have been in a continuous loss position:
					As of December 31, 2014
		Number			Less than 12 Months								12 Months or More					Total
		of
	Available for Sale	Securities			Estimated				Unrealized				Estimated			Unrealized		Estimated		Unrealized
					Fair				Losses				Fair			Losses		Fair		Losses
					Value								Value					Value
	(in thousands, except number of securities)
	U.S. Government agencies and corporations	4			$	9,946			$	11			$	15,018		$	254	$	24,964	$	265
	State and political subdivisions	46			3,024				18				10,728			172		13,752		190
	Collateralized mortgage obligations	14			14,971				123				68,370			1,970		83,341		2,093
	Corporate debt securities	7			23,024				50				3,400			53		26,424		103
	Other equity securities	1			—				—				966			34		966		34
	Total	72			$	50,965			$	202			$	98,482		$	2,483	$	149,447	$	2,685
					As of December 31, 2013
		Number			Less than 12 Months								12 Months or More					Total
		of
		Securities			Estimated				Unrealized				Estimated			Unrealized		Estimated		Unrealized
					Fair				Losses				Fair			Losses		Fair		Losses
					Value								Value					Value
	(in thousands, except number of securities)
	U.S. Government agencies and corporations	3			$	21,977			$	867			$	—		$	—	$	21,977	$	867
	State and political subdivisions	171			54,153				2,331				1,799			232		55,952		2,563
	Collateralized mortgage obligations	18			110,142				3,164				5,047			330		115,189		3,494
	Collateralized debt obligations	3			—				—				934			984		934		984
	Corporate debt securities	3			7,430				93				1,561			49		8,991		142
	Other equity securities	1			945				55				—			—		945		55
	Total	199			$	194,647			$	6,510			$	9,341		$	1,595	$	203,988	$	8,105
					As of December 31, 2014
		Number			Less than 12 Months								12 Months or More					Total
		of
	Held to Maturity	Securities			Estimated				Unrealized				Estimated			Unrealized		Estimated		Unrealized
					Fair				Losses				Fair			Losses		Fair		Losses
					Value								Value					Value
	(in thousands, except number of securities)
	State and political subdivisions	29			$	5,322			$	190			$	9,144		$	62	$	14,466	$	252
	Collateralized mortgage obligations	1			—				—				8,298			233		8,298		233
	Corporate debt securities	2			2,358				27				750			132		3,108		159
	Total	32			$	7,680			$	217			$	18,192		$	427	$	25,872	$	644
					As of December 31, 2013
		Number			Less than 12 Months								12 Months or More					Total
		of
		Securities			Estimated				Unrealized				Estimated			Unrealized		Estimated		Unrealized
					Fair				Losses				Fair			Losses		Fair		Losses
					Value								Value					Value
	(in thousands, except number of securities)
	State and political subdivisions	30			$	17,420			$	1,195			$	1,142		$	131	$	18,562	$	1,326
	Collateralized mortgage obligations	1			8,613				834				—			—		8,613		834
	Corporate debt securities	2			2,984				277				—			—		2,984		277
	Total	33			$	29,017			$	2,306			$	1,142		$	131	$	30,159	$	2,437
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Table Text Block]	The following table provides a roll forward of credit losses on fixed maturity securities recognized in net income:
		Year Ended December 31,
		2014				2013
	(in thousands)
	Beginning balance	$	6,639			$	7,379
	Additional credit losses:
	Securities with no previous other than temporary impairment	—				—
	Securities with previous other than temporary impairments	—				—
	Reductions to credit losses:
	Securities with previous other than temporary impairments, due to liquidation	—				(740		)
	Securities with previous other than temporary impairments, due to sale	(6,639		)		—
	Ending balance	$	—			$	6,639
Investments Classified by Contractual Maturity Date [Table Text Block]	The contractual maturity distribution of investment debt securities at December 31, 2014, is summarized as follows:
		Available For Sale								Held to Maturity
		Amortized				Fair Value				Amortized				Fair Value
		Cost								Cost
	(in thousands)
	Due in one year or less	$	22,476			$	22,637			$	190			$	189
	Due after one year through five years	122,371				124,385				2,750				2,723
	Due after five years through ten years	102,908				107,773				17,829				17,905
	Due after ten years	37,569				38,520				22,202				22,113
	Debt securities without a single maturity date	178,377				178,595				8,553				8,323
	Total	$	463,701			$	471,910			$	51,524			$	51,253
Schedule of Realized Gain (Loss) [Table Text Block]	Realized gains and losses on sales are determined on the basis of specific identification of investments based on the trade date. Realized gains (losses) on investments, including impairment losses for the years ended December 31, 2014, 2013 and 2012, were as follows:
		Year Ended December 31,
		2014				2013				2012
	(in thousands)
	Available for sale fixed maturity securities:
	Gross realized gains	$	1,463			$	144			$	424
	Gross realized losses	(236		)		(79		)		—
	Other-than-temporary impairment	—				—				(345		)
		1,227				65				79
	Equity securities:
	Gross realized gains	—				—				381
	Gross realized losses	—				—				—
	Other-than-temporary impairment	—				—				—
		—				—				381
	Total net realized gains and losses	$	1,227			$	65			$	460

Loans_Receivable_and_the_Allow2

Loans Receivable and the Allowance for Loan Losses (Tables)	12 Months Ended
	Dec. 31, 2014
Loans Receivable and the Allowance for Loan Losses [Abstract]
Certain Loans Acquired With Deteriorated Qredit Quality [Table Text Block]	The outstanding balances and carrying values as of December 31, 2014 and 2013, of the loans purchased that met the level-yield income recognition criteria under ASC Topic 310 are as follows:
		As of December 31,
		2014				2013
	(in thousands)
	Commercial	477				502
	Real Estate:
	1-4 family residences	201				229
	Commercial	1,930				2,320
	Total real estate	2,131				2,549
	Total	$	2,608			$	3,051
	Allowance	(56		)		(48		)
	Carrying amount, net of allowance	$	2,552			$	3,003
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]	The composition of allowance for loan losses, loans, and loan pool participations by portfolio segment, as of and for the years ended December 31, 2014 and 2013, were as follows:
		Allowance for Loan Losses and Recorded Investment in Loan Receivables
		For the Years Ended December 31, 2014 and 2013
	(in thousands)	Agricultural				Commercial and Industrial				Commercial Real Estate			Residential Real Estate				Consumer			Unallocated				Total
	2014
	Allowance for loan losses:
	Individually evaluated for impairment	$	88			$	206			$	226		$	623			$	2		$	—			$	1,145
	Collectively evaluated for impairment	1,418				5,574				4,173			2,544				321			1,188				15,218
	Total	$	1,506			$	5,780			$	4,399		$	3,167			$	323		$	1,188			$	16,363
	Loans acquired with deteriorated credit quality (loan pool participations)	$	—			$	70			$	669		$	82			$	9		$	1,304			$	2,134
	Loans receivable
	Individually evaluated for impairment	$	3,027			$	3,168			$	3,916		$	3,341			$	34		$	—			$	13,486
	Collectively evaluated for impairment	101,782				301,732				422,605			269,270				23,644			—				1,119,033
	Total	$	104,809			$	304,900			$	426,521		$	272,611			$	23,678		$	—			$	1,132,519
	Loans acquired with deteriorated credit quality (loan pool participations)*	$	4			$	935			$	14,246		$	3,340			$	12		$	2,929			$	21,466
	(in thousands)	Agricultural				Commercial and Industrial				Commercial Real Estate			Residential Real Estate				Consumer			Unallocated				Total
	2013
	Allowance for loan losses:
	Individually evaluated for impairment	$	125			$	559			$	513		$	220			$	6		$	—			$	1,423
	Collectively evaluated for impairment	1,233				4,421				4,781			2,965				269			1,087				14,756
	Total	$	1,358			$	4,980			$	5,294		$	3,185			$	275		$	1,087			$	16,179
	Loans acquired with deteriorated credit quality (loan pool participations)	$	3			$	64			$	627		$	88			$	6		$	1,346			$	2,134
	Loans receivable
	Individually evaluated for impairment	$	3,146			$	3,521			$	5,079		$	1,664			$	50		$	—			$	13,460
	Collectively evaluated for impairment	94,021				260,130				429,345			272,462				18,994			—				1,074,952
	Total	$	97,167			$	263,651			$	434,424		$	274,126			$	19,044		$	—			$	1,088,412
	Loans acquired with deteriorated credit quality (loan pool participations)*	$	49			$	1,302			$	18,168		$	3,823			$	18		$	4,307			$	27,667
	* The amount shown as “Unallocated” represents the carrying value of other real estate owned within the loan pool participation portfolio total.
Allowance for Credit Losses on Financing Receivables [Table Text Block]	The changes in the allowance for loan losses by portfolio segment, as of and for the years ended December 31, 2014, 2013, and 2012 were as follows:
		Allowance for Loan Loss Activity
		For the Years Ended December 31, 2014, 2013, and 2012
	(in thousands)	Agricultural				Commercial and Industrial				Commercial Real Estate			Residential Real Estate				Consumer			Unallocated				Total
	2014
	Beginning balance	$	1,358			$	4,980			$	5,294		$	3,185			$	275		$	1,087			$	16,179
	Charge-offs	(26		)		(685		)		(165		)	(409		)		(76		)	—				(1,361		)
	Recoveries	10				217				61			22				35			—				345
	Provision	164				1,268				(791		)	369				89			101				1,200
	Ending balance	$	1,506			$	5,780			$	4,399		$	3,167			$	323		$	1,188			$	16,363
	2013
	Beginning balance	$	1,026			$	4,599			$	5,767		$	3,007			$	356		$	1,202			$	15,957
	Charge-offs	(39		)		(790		)		(545		)	(286		)		(147		)	—				(1,807		)
	Recoveries	36				70				479			67				27			—				679
	Provision	335				1,101				(407		)	397				39			(115		)		1,350
	Ending balance	$	1,358			$	4,980			$	5,294		$	3,185			$	275		$	1,087			$	16,179
	2012
	Beginning balance	$	1,209			$	5,380			$	5,171		$	3,501			$	167		$	248			$	15,676
	Charge-offs	—				(2,345		)		(129		)	(537		)		(90		)	—				(3,101		)
	Recoveries	507				423				24			31				18			—				1,003
	Provision	(690		)		1,141				701			12				261			954				2,379
	Ending balance	$	1,026			$	4,599			$	5,767		$	3,007			$	356		$	1,202			$	15,957
Troubled Debt Restructurings on Financing Receivables [Table Text Block]	The following tables set forth information on the Company's TDRs by class of financing receivable occurring during the stated periods:
		For the Year Ended December 31,
		2014										2013								2012
		Number of Contracts		Pre-Modification Outstanding Recorded Investment				Post-Modification Outstanding Recorded Investment				Number of Contracts	Pre-Modification Outstanding Recorded Investment				Post-Modification Outstanding Recorded Investment			Number of Contracts		Pre-Modification Outstanding Recorded Investment				Post-Modification Outstanding Recorded Investment
	(dollars in thousands)
	Troubled Debt Restructurings(1):
	Commercial and industrial
	Amortization or maturity date change	1		1,405				1,405				10	1,546				1,546			1		551				551
	Commercial real estate:
	Farmland
	Interest rate reduction	0		—				—				0	—				—			2		2,475				2,388
	Commercial real estate-other
	Amortization or maturity date change	0		—				—				2	165				136			0		—				—
	Residential real estate:
	One- to four- family first liens
	Interest rate reduction	1		285				292				2	164				169			0		—				—
	Amortization or maturity date change	0		—				—				1	66				69			0		—				—
	One- to four- family junior liens
	Interest rate reduction	0		—				—				1	8				13			1		135				138
	Total	2		$	1,690			$	1,697			16	$	1,949			$	1,933		4		$	3,161			$	3,077
	(1) TDRs may include multiple concessions and the disclosure classifications are based on the primary concession provided to the borrower.
	Loans by class of financing receivable modified as TDRs within the previous 12 months and for which there was a payment default during the stated periods were:
		For the Year Ended December 31,
		2014						2013					2012
		Number of Contracts		Recorded Investment				Number of Contracts		Recorded Investment			Number of Contracts		Recorded Investment
	(dollars in thousands)
	Troubled Debt Restructurings(1) That Subsequently Defaulted:
	Commercial and industrial
	Amortization or maturity date change	0		—				0		—			1		$	547
	Commercial real estate:
	Commercial real estate-other
	Amortization or maturity date change	0		—				1		69			0		—
	Residential real estate:
	One- to four- family first liens
	Interest rate reduction	0		—				1		111			0		—
	Total	0		$	—			2		$	180		1		$	547
	(1) TDRs may include multiple concessions and the disclosure classifications are based on the primary concession provided to the borrower.
Financing Receivable Credit Quality Indicators [Table Text Block]	The following table sets forth the composition of the Company’s loans and loan pool participations by internally assigned credit quality indicators at December 31, 2014 and 2013:
		Pass				Special Mention/Watch				Substandard			Doubtful				Loss			Total
	(in thousands)
	2014
	Agricultural	$	98,096			$	5,032			$	1,681		$	—			$	—		$	104,809
	Commercial and industrial	273,290				7,468				22,350			—				—			303,108
	Credit cards	1,240				6				—			—				—			1,246
	Overdrafts	373				262				109			—				—			744
	Commercial real estate:
	Construction & development	56,963				1,151				1,269			—				—			59,383
	Farmland	79,629				1,778				2,293			—				—			83,700
	Multifamily	54,708				178				—			—				—			54,886
	Commercial real estate-other	215,268				11,216				2,068			—				—			228,552
	Total commercial real estate	406,568				14,323				5,630			—				—			426,521
	Residential real estate:
	One- to four- family first liens	211,390				3,933				3,991			—				—			219,314
	One- to four- family junior liens	53,039				48				210			—				—			53,297
	Total residential real estate	264,429				3,981				4,201			—				—			272,611
	Consumer	23,431				8				41			—				—			23,480
	Total	$	1,067,427			$	31,080			$	34,012		$	—			$	—		$	1,132,519
	Loans acquired with deteriorated credit quality (loan pool participations)	$	10,256			$	—			$	11,202		$	—			$	8		$	21,466
	2013
	Agricultural	$	93,187			$	460			$	3,520		$	—			$	—		$	97,167
	Commercial and industrial	239,485				11,097				11,786			—				—			262,368
	Credit cards	1,010				1				17			—				—			1,028
	Overdrafts	326				123				88			—				—			537
	Commercial real estate:
	Construction & development	56,112				14,984				1,493			—				—			72,589
	Farmland	80,044				3,091				2,340			—				—			85,475
	Multifamily	53,315				1,732				396			—				—			55,443
	Commercial real estate-other	205,914				12,994				2,009			—				—			220,917
	Total commercial real estate	395,385				32,801				6,238			—				—			434,424
	Residential real estate:
	One- to four- family first liens	213,815				3,994				2,859			—				—			220,668
	One- to four- family junior liens	53,225				38				195			—				—			53,458
	Total residential real estate	267,040				4,032				3,054			—				—			274,126
	Consumer	18,643				57				62			—				—			18,762
	Total	$	1,015,076			$	48,571			$	24,765		$	—			$	—		$	1,088,412
	Loans acquired with deteriorated credit quality (loan pool participations)	$	13,569			$	—			$	14,093		$	—			$	5		$	27,667
Impaired Financing Receivables [Table Text Block]	The following tables set forth the amounts and categories of the Company’s impaired loans as of December 31, 2014 and 2013:
		As of December 31,
		2014											2013
		Recorded Investment				Unpaid Principal Balance				Related Allowance			Recorded Investment				Unpaid Principal Balance			Related Allowance
	(in thousands)
	With no related allowance recorded:
	Agricultural	$	1,410			$	1,910			$	—		$	1,475			$	1,975		$	—
	Commercial and industrial	2,169				2,270				—			1,919				2,020			—
	Credit cards	—				—				—			—				—			—
	Overdrafts	—				—				—			—				—			—
	Commercial real estate:
	Construction & development	49				176				—			132				601			—
	Farmland	2,270				2,433				—			93				107			—
	Multifamily	—				—				—			—				—			—
	Commercial real estate-other	939				1,064				—			587				612			—
	Total commercial real estate	3,258				3,673				—			812				1,320			—
	Residential real estate:
	One- to four- family first liens	535				773				—			622				741			—
	One- to four- family junior liens	134				157				—			50				50			—
	Total residential real estate	669				930				—			672				791			—
	Consumer	6				22				—			10				26			—
	Total	$	7,512			$	8,805			$	—		$	4,888			$	6,132		$	—
	With an allowance recorded:
	Agricultural	$	1,617			$	1,617			$	88		$	1,671			$	1,671		$	125
	Commercial and industrial	999				999				206			1,602				1,657			559
	Credit cards	—				—				—			—				—			—
	Overdrafts	—				—				—			—				—			—
	Commercial real estate:
	Construction & development	34				34				34			7				7			3
	Farmland	74				74				4			2,311				2,461			219
	Multifamily	—				—				—			—				—			—
	Commercial real estate-other	550				550				188			1,949				2,164			291
	Total commercial real estate	658				658				226			4,267				4,632			513
	Residential real estate:
	One- to four- family first liens	2,600				2,600				594			902				902			170
	One- to four- family junior liens	72				72				29			90				90			50
	Total residential real estate	2,672				2,672				623			992				992			220
	Consumer	28				28				2			40				40			6
	Total	$	5,974			$	5,974			$	1,145		$	8,572			$	8,992		$	1,423
	Total:
	Agricultural	$	3,027			$	3,527			$	88		$	3,146			$	3,646		$	125
	Commercial and industrial	3,168				3,269				206			3,521				3,677			559
	Credit cards	—				—				—			—				—			—
	Overdrafts	—				—				—			—				—			—
	Commercial real estate:
	Construction & development	83				210				34			139				608			3
	Farmland	2,344				2,507				4			2,404				2,568			219
	Multifamily	—				—				—			—				—			—
	Commercial real estate-other	1,489				1,614				188			2,536				2,776			291
	Total commercial real estate	3,916				4,331				226			5,079				5,952			513
	Residential real estate:
	One- to four- family first liens	3,135				3,373				594			1,524				1,643			170
	One- to four- family junior liens	206				229				29			140				140			50
	Total residential real estate	3,341				3,602				623			1,664				1,783			220
	Consumer	34				50				2			50				66			6
	Total	$	13,486			$	14,779			$	1,145		$	13,460			$	15,124		$	1,423
	The following table sets forth the average recorded investment and interest income recognized for each category of the Company’s impaired loans during the stated periods:
		For the Year Ended December 31,
		2014								2013							2012
		Average Recorded Investment				Interest Income Recognized				Average Recorded Investment			Interest Income Recognized				Average Recorded Investment			Interest Income Recognized
	(in thousands)
	With no related allowance recorded:
	Agricultural	$	1,413			$	211			$	1,128		$	114			$	1,600		$	60
	Commercial and industrial	2,234				160				2,025			76				965			52
Credit cards	—				—				—			—				—			—
Overdrafts	—				—				—			—				—			—
Commercial real estate:
Construction & development	49				—				149			21				316			—
Farmland	2,288				456				101			8				83			8
Multifamily	—				—				—			—				—			—
Commercial real estate-other	975				(3		)		593			25				1,770			72
Total commercial real estate	3,312				453				843			54				2,169			80
Residential real estate:
One- to four- family first liens	547				32				669			14				143			4
One- to four- family junior liens	134				6				50			1				43			3
Total residential real estate	681				38				719			15				186			7
Consumer	8				—				12			—				16			—
Total	$	7,648			$	862			$	4,727		$	259			$	4,936		$	199
With an allowance recorded:
Agricultural	$	1,627			$	203			$	1,681		$	51			$	1,723		$	50
Commercial and industrial	1,044				104				1,697			75				1,044			36
Credit cards	—				—				—			—				—			—
Overdrafts	—				—				—			—				—			—
Commercial real estate:
Construction & development	35				3				7			—				526			30
Farmland	74				3				2,315			110				2,504			114
Multifamily	—				—				—			—				—			—
Commercial real estate-other	551				43				1,921			55				559			18
Total commercial real estate	660				49				4,243			165				3,589			162
Residential real estate:
One- to four- family first liens	2,612				203				909			38				645			33
One- to four- family junior liens	74				—				92			1				68			2
Total residential real estate	2,686				203				1,001			39				713			35
Consumer	31				5				41			2				24			2
Total	$	6,048			$	564			$	8,663		$	332			$	7,093		$	285
Total:
Agricultural	$	3,040			$	414			$	2,809		$	165			$	3,323		$	110
Commercial and industrial	3,278				264				3,722			151				2,009			88
Credit cards	—				—				—			—				—			—
Overdrafts	—				—				—			—				—			—
Commercial real estate:
Construction & development	84				3				156			21				842			30
Farmland	2,362				459				2,416			118				2,587			122
Multifamily	—				—				—			—				—			—
Commercial real estate-other	1,526				40				2,514			80				2,329			90
Total commercial real estate	3,972				502				5,086			219				5,758			242
Residential real estate:
One- to four- family first liens	3,159				235				1,578			52				788			37
One- to four- family junior liens	208				6				142			2				111			5
Total residential real estate	3,367				241				1,720			54				899			42
Consumer	39				5				53			2				40			2
Total	$	13,696			$	1,426			$	13,390		$	591			$	12,029		$	484
Past Due Loan Receivables [Table Text Block]	The following table sets forth the composition and past due status of the Company’s loans at December 31, 2014 and 2013:
		30 - 59 Days Past Due				60 - 89 Days Past Due				90 Days or More Past Due			Total Past Due				Current			Total Loans Receivable				Recorded Investment > 90 Days Past Due and Accruing
	(in thousands)
	2014
	Agricultural	$	58			$	30			$	—		$	88			$	104,721		$	104,809			$	—
	Commercial and industrial	897				603				515			2,015				301,093			303,108				66
	Credit cards	3				3				—			6				1,240			1,246				—
	Overdrafts	104				2				4			110				634			744				—
	Commercial real estate:
	Construction & development	—				—				83			83				59,300			59,383				—
	Farmland	503				—				—			503				83,197			83,700				—
	Multifamily	—				—				—			—				54,886			54,886				—
	Commercial real estate-other	168				57				1,200			1,425				227,127			228,552				—
	Total commercial real estate	671				57				1,283			2,011				424,510			426,521				—
	Residential real estate:
	One- to four- family first liens	1,481				581				2,023			4,085				215,229			219,314				780
	One- to four- family junior liens	105				48				192			345				52,952			53,297				—
	Total residential real estate	1,586				629				2,215			4,430				268,181			272,611				780
	Consumer	35				8				23			66				23,414			23,480				2
	Total	$	3,354			$	1,332			$	4,040		$	8,726			$	1,123,793		$	1,132,519			$	848
	2013
	Agricultural	$	65			$	23			$	52		$	140			$	97,027		$	97,167			$	—
	Commercial and industrial	610				876				960			2,446				259,922			262,368				213
	Credit cards	—				1				17			18				1,010			1,028				17
	Overdrafts	40				1				48			89				448			537				—
	Commercial real estate:
	Construction & development	84				—				56			140				72,449			72,589				—
	Farmland	—				—				—			—				85,475			85,475				—
	Multifamily	—				—				395			395				55,048			55,443				395
	Commercial real estate-other	604				190				1,740			2,534				218,383			220,917				164
	Total commercial real estate	688				190				2,191			3,069				431,355			434,424				559
	Residential real estate:
	One- to four- family first liens	1,891				869				984			3,744				216,924			220,668				540
	One- to four- family junior liens	316				38				175			529				52,929			53,458				49
	Total residential real estate	2,207				907				1,159			4,273				269,853			274,126				589
	Consumer	17				62				36			115				18,647			18,762				7
	Total	$	3,627			$	2,060			$	4,463		$	10,150			$	1,078,262		$	1,088,412			$	1,385
Schedule of Loans, Non Accrual Status [Table Text Block]	The following table sets forth the composition of the Company’s recorded investment in loans on nonaccrual status as of December 31, 2014 and 2013:
		As of December 31,
		2014				2013
	(in thousands)
	Agricultural	$	—			$	52
	Commercial and industrial	479				746
	Credit cards	—				—
	Overdrafts	—				—
	Commercial real estate:
	Construction & development	83				139
	Farmland	24				29
	Multifamily	—				—
	Commercial real estate-other	1,200				1,576
	Total commercial real estate	1,307				1,744
	Residential real estate:
	One- to four- family first liens	1,261				543
	One- to four- family junior liens	192				126
	Total residential real estate	1,453				669
	Consumer	16				29
	Total	$	3,255			$	3,240
Certain Loans Acquired With Deteriorated Qredit Quality [Table Text Block]	A summary of the changes in the carrying value of loan pool participations for the years ended December 31, 2014 and 2013, is as follows:
		For the Year Ended December 31,
		2014				2013
	(in thousands)
	Balance at beginning of year	$	25,533			$	35,650
	Principal payments	(4,724		)		(8,687		)
	Net charge-offs	(1,477		)		(1,430		)
	Balance at end of year	$	19,332			$	25,533
	Total face value at end of year	$	68,376			$	80,902
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Table Text Block]	Changes in accretable yield on the loans that met the level-yield income recognition criteria under ASC Topic 310 were as follows:
		Accretable Yield December 31,
		2014				2013
	(in thousands)
	Balance at beginning of year	$	2,244			$	2,627
	Additions	—				—
	Accretions	(665		)		(383		)
	Reclassifications to nonaccretable differences	—				—
	Balance at end of year	$	1,579			$	2,244
	Cash flows expected to be collected at acquisition	$	7,913			$	8,128
	Basis in acquired loans at acquisition	$	4,482			$	4,638

Premises_and_Equipment_Tables

Premises and Equipment (Tables)	12 Months Ended
	Dec. 31, 2014
Premises and Equipment [Abstract]
Property, Plant and Equipment [Table Text Block]	Premises and equipment as of December 31, 2014 and 2013 were as follows:
		As of December 31,
		2014		2013
	(in thousands)
	Land	$	4,836	$	4,836
	Buildings and leasehold improvements	29,942		30,278
	Furniture and equipment	13,206		13,741
	Construction in process	14,705		3,774
	Premises and equipment	62,689		52,629
	Accumulated depreciation and amortization	24,919		24,947
	Premises and equipment, net	$	37,770	$	27,682

Intangible_Assets_Tables

Intangible Assets (Tables)	12 Months Ended
	Dec. 31, 2014
Intangible Assets [Abstract]
Schedule of Intangible Assets and Goodwill [Table Text Block]	The following table summarizes the amounts and carrying values of intangible assets as of December 31, 2014 and 2013:
		Weighted		Gross						Unamortized
		Average		Carrying			Accumulated			Intangible
		Useful Life		Amount			Amortization			Assets
	(dollars in thousands)	(years)
	December 31, 2014
	Other intangible assets:
	Insurance agency intangible	7		$	1,320		$	956		$	364
	Core deposit premium	4		5,433			4,742			691
	Trade name intangible	—		7,040			—			7,040
	Customer list intangible	9		330			166			164
	Total			$	14,123		$	5,864		$	8,259
	December 31, 2013
	Other intangible assets:
	Insurance agency intangible	8		$	1,320		$	850		$	470
	Core deposit premium	5		5,433			4,322			1,111
	Trade name intangible	—		7,040			—			7,040
	Customer list intangible	10		330			145			185
	Total			$	14,123		$	5,317		$	8,806
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]	The following table summarizes future amortization expense of intangible assets:
		Insurance			Core			Customer
		Agency			Deposit			List
		Intangible			Premium			Intangible			Totals
	(in thousands)
	Year ending December 31,
	2015	$	89		$	321		$	21		$	431
	2016	72			222			20			314
	2017	55			123			19			197
	2018	38			25			18			81
	2019	21			—			17			38
	Thereafter	89			—			69			158
	Total	$	364		$	691		$	164		$	1,219

Other_Assets_Tables

Other Assets (Tables)	12 Months Ended
	Dec. 31, 2014
Other Assets [Abstract]
Schedule of Other Assets [Table Text Block]	The components of the Company’s other assets as of December 31, 2014 and 2013 were as follows:
		As of December 31,
		2014		2013
	(in thousands)
	Federal Home Loan Bank Stock	$	8,582	$	9,226
	Prepaid expenses	1,350		1,030
	Mortgage servicing rights	2,308		2,298
	Accounts receivable & other miscellaneous assets	1,835		2,006
		$	14,075	$	14,560

Time_Deposits_Tables

Time Deposits (Tables)	12 Months Ended
	Dec. 31, 2014
Time Deposits [Abstract]
Contractual Obligation, Fiscal Year Maturity Schedule [Table Text Block]	At December 31, 2014, the scheduled maturities of certificates of deposits were as follows:
	(in thousands)
	2015	$	267,510
	2016	127,149
	2017	60,174
	2018	9,004
	2019	9,177
	Total	$	473,014

Federal_Home_Loan_Bank_Borrowi1

Federal Home Loan Bank Borrowings and Long-Term Debt (Tables)	12 Months Ended
	Dec. 31, 2014
Federal Home Loan Bank Borrowings and Long-Term Debt [Abstract]
Schedule of Federal Home Loan Bank, Advances, by Branch of FHLB Bank [Table Text Block]	As of December 31, 2014 and 2013, Federal Home Loan Bank borrowings were as follows:
		Rates					Amount
		Minimum			Maximum		2014		2013
	(in thousands)
	Due in 2014	1.25	%	to	3.4	%	$	—	$	39,900
	Due in 2015	2.06	%	to	3	%	20,000		20,000
	Due in 2016	1.13	%	to	2.46	%	17,000		17,000
	Due in 2017	1.09	%	to	2.78	%	10,000		10,000
	Due in 2018	1.3	%	to	1.83	%	17,000		5,000
	Due in 2019	1.42	%	to	1.85	%	17,000		10,000
	Thereafter	1.52	%	to	2.25	%	12,000		5,000
	Total						$	93,000	$	106,900

Income_Taxes_Tables

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2014
Income Taxes [Abstract]
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]	Income taxes for the years ended December 31, 2014, 2013 and 2012 are summarized as follows:
		December 31,
		2014			2013			2012
	(in thousands)
	Current:
	Federal	$	3,573		$	6,841		$	4,165
	State	956			1,259			1,103
	Deferred	2,502			(1,454		)	(54		)
	Total income tax provision	$	7,031		$	6,646		$	5,214
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]	The income tax provisions for the years ended December 31, 2014, 2013 and 2012 were less than the amounts computed by applying the maximum effective federal income tax rate of 35% for the years ended December 31, 2014 and 2013, and 34% for the year of 2012, to the income before income taxes because of the following items:
		2014			2013			2012
	(in thousands)
	Expected provision	$	8,943		$	8,839		$	7,394
	Tax-exempt interest	(2,520		)	(2,345		)	(2,213		)
	Bank-owned life insurance	(385		)	(322		)	(323		)
	State income taxes, net of federal income tax benefit	798			776			723
	Non-deductible acquisition expenses	261			—			—
	Other	(66		)	(302		)	(367		)
	Total income tax provision	$	7,031		$	6,646		$	5,214
Schedule of Deferred Tax Assets and Liabilities [Table Text Block]	Net deferred tax assets as of December 31, 2014 and 2013 consisted of the following components:
		December 31,
		2014			2013
	(in thousands)
	Deferred income tax assets:
	Allowance for loan losses	$	7,981		$	7,753
	Deferred compensation	1,022			1,076
	Net operating losses	3,266			3,089
	Impairment losses on securities	53			2,613
	Other real estate owned	568			767
	Nonaccrual interest	206			434
	Other	1,072			931
	Gross deferred tax assets	14,168			16,663
	Deferred income tax liabilities:
	Premises and equipment depreciation and amortization	1,992			2,012
	Federal Home Loan Bank stock	132			132
	Purchase accounting adjustments	684			895
	Mortgage servicing rights	875			871
	Prepaid expenses	213			105
	Unrealized gains on investment securities	3,234			620
	Deferred loan fees	249			238
	Other	253			315
	Gross deferred tax liabilities	7,632			5,188
	Net deferred income tax asset	6,536			11,475
	Valuation allowance	3,458			3,281
	Net deferred tax asset	$	3,078		$	8,194

Stock_Compensation_Plans_Table

Stock Compensation Plans (Tables)	12 Months Ended
	Dec. 31, 2014
Stock Compensation Plans [Abstract]
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]	The following is a summary of stock option activity for the year ended December 31, 2014:
						Weighted-
						Average
				Weighted-		Remaining	Aggregate
				Average		Contractual	Intrinsic
				Exercise		Term in	Value
		Shares		Price		Years	$0
	Outstanding at December 31, 2013	47,590		$	15.66
	Granted	—		—
	Exercised	(15,419	)	18.5
	Forfeited	—		—
	Expired	(1,310	)	19.5
	Outstanding at December 31, 2014	30,861		$	14.08	3.1	$	455
	Exercisable at December 31, 2014	30,861		$	14.08	3.1	$	455
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block]	The following is a summary of nonvested restricted stock unit activity for the year ended December 31, 2014:
				Weighted-
				Average
				Grant-Date
		Shares		Fair Value
	Nonvested at December 31, 2013	52,397		$	18.24
	Granted	26,100		24.61
	Vested	(27,491	)	17.02
	Forfeited	(200	)	19.1
	Nonvested at December 31, 2014	50,806		$	22.17

Earnings_per_Common_Share_Tabl

Earnings per Common Share (Tables)	12 Months Ended
	Dec. 31, 2014
Earnings per Common Share [Abstract]
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]	Following are the calculations for basic and diluted earnings per common share:
		Year Ended December 31,
		2014		2013		2012
	(dollars in thousands, except per share amounts)
	Basic earnings per common share computation
	Numerator:
	Net income	$	18,522	$	18,607	$	16,534
	Denominator:
	Weighted average shares outstanding	8,405,284		8,477,904		8,485,008
	Basic earnings per common share	$	2.2	$	2.19	$	1.95
	Diluted earnings per common share computation
	Numerator:
	Net income	$	18,522	$	18,607	$	16,534
	Denominator:
	Weighted average shares outstanding, included all dilutive potential shares	8,433,296		8,525,119		8,527,544
	Diluted earnings per common share	$	2.19	$	2.18	$	1.94

Regulatory_Capital_Requirement1

Regulatory Capital Requirements and Restrictions on Subsidiary Cash (Tables)	12 Months Ended
	Dec. 31, 2014
Regulatory Capital Requirements and Restrictions on Subsidiary Cash [Abstract]
Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations [Table Text Block]	A comparison of the Company’s and the Bank’s capital with the corresponding minimum regulatory requirements in effect as of December 31, 2014, is presented below:
		Actual				For Capital Adequacy Purposes				To Be Well Capitalized Under Prompt Corrective Action Provisions
		Amount		Ratio		Amount		Ratio		Amount		Ratio
	(dollars in thousands)
	At December 31, 2014:
	Consolidated:
	Total capital/risk based	$	212,559	14.73	%	$	115,407	8	%	N/A		N/A
	Tier 1 capital/risk based	194,362		13.47		57,703		4		N/A		N/A
	Tier 1 capital/adjusted average	194,362		10.85		71,647		4		N/A		N/A
	MidWestOne Bank:
	Total capital/risk based	$	197,018	13.75	%	$	114,624	8	%	$	143,280	10	%
	Tier 1 capital/risk based	179,098		12.5		57,312		4		85,968		6
	Tier 1 capital/adjusted average	179,098		10.05		71,249		4		89,061		5
	At December 31, 2013:
	Consolidated:
	Total capital/risk based	$	200,714	14.62	%	$	109,812	8	%	N/A		N/A
	Tier 1 capital/risk based	183,361		13.36		54,906		4		N/A		N/A
	Tier 1 capital/adjusted average	183,361		10.55		69,491		4		N/A		N/A
	MidWestOne Bank:
	Total capital/risk based	$	183,646	13.49	%	$	108,903	8	%	$	136,128	10	%
	Tier 1 capital/risk based	166,612		12.24		54,451		4		81,677		6
	Tier 1 capital/adjusted average	166,612		9.65		69,063		4		86,329		5

Commitments_and_Contingencies_

Commitments and Contingencies (Tables)	12 Months Ended
	Dec. 31, 2014
Commitments and Contingencies [Abstract]
Credit Commitments [Table Text Block]	A summary of the Bank’s commitments at December 31, 2014 and 2013, is as follows:
		December 31,
		2014		2013
	(in thousands)
	Commitments to extend credit	$	267,036	$	263,887
	Commitments to sell loans	801		357
	Standby letters of credit	3,204		4,491
	Total	$	271,041	$	268,735

Related_Party_Transactions_Tab

Related Party Transactions (Tables)	12 Months Ended
	Dec. 31, 2014
Related Party Transactions [Abstract]
Schedule of Related Party Transactions [Table Text Block]	The following is an analysis of the changes in the loans to related parties during the years ended December 31, 2014 and 2013:
		Year Ended December 31,
		2014			2013
	(in thousands)
	Balance, beginning	$	22,392		$	21,935
	Net decrease due to change in related parties	(10,275		)	(150		)
	Advances	2,420			2,310
	Collections	(2,882		)	(1,703		)
	Balance, ending	$	11,655		$	22,392

Estimated_Fair_Value_of_Financ1

Estimated Fair Value of Financial Instruments and Fair Value Measurements (Tables)	12 Months Ended
	Dec. 31, 2014
Estimated Fair Value of Financial Instruments and Fair Value Measurements [Abstract]
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]	The following table summarizes assets measured at fair value on a recurring basis as of December 31, 2014 and 2013. There were no liabilities subject to fair value measurement on a recurring basis as of these dates. The assets are segregated by the level of valuation inputs within the fair value hierarchy utilized to measure fair value:
		Fair Value Measurement at December 31, 2014 Using
	(in thousands)	Total				Quoted Prices in				Significant Other				Significant
						Active Markets for				Observable				Unobservable
						Identical Assets				Inputs				Inputs
						(Level 1)				(Level 2)				(Level 3)
	Assets:
	Available for sale debt securities:
	U.S. Government agencies and corporations	$	49,375			$	—			$	49,375			$	—
	State and political subdivisions	195,199				—				195,199				—
	Mortgage-backed securities	32,463				—				32,463				—
	Collateralized mortgage obligations	146,132				—				146,132				—
	Corporate debt securities	48,741				—				48,741				—
	Total available for sale debt securities	471,910				—				471,910				—
	Other equity securities	3,032				3,032				—				—
	Total securities available for sale	$	474,942			$	3,032			$	471,910			$	—
	Mortgage servicing rights	$	2,308			$	—			$	—			$	2,308
		Fair Value Measurement at December 31, 2013 Using
	(in thousands)	Total				Quoted Prices in				Significant				Significant
						Active Markets for				Other				Unobservable
						Identical Assets				Observable				Inputs
						(Level 1)				Inputs				(Level 3)
										(Level 2)
	Assets:
	Available for sale debt securities:
	U.S. Government agencies and corporations	$	44,939			$	—			$	44,939			$	—
	State and political subdivisions	210,796				—				210,796				—
	Mortgage-backed securities	39,285				—				39,285				—
	Collateralized mortgage obligations	169,223				—				169,223				—
	Corporate debt securities	29,944				—				29,944				—
	Collateralized debt obligations	1,317				—				—				1,317
	Total available for sale debt securities	495,504				—				494,187				1,317
	Other equity securities	3,057				3,057				—				—
	Total securities available for sale	$	498,561			$	3,057			$	494,187			$	1,317
	Mortgage servicing rights	$	2,298			$	—			$	—			$	2,298
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]	The following table presents additional information about assets measured at fair market value on a recurring basis for which the Company has utilized Level 3 inputs to determine fair value for the years ended December 31, 2014 and 2013:
			For the Years Ended December 31,
			2014								2013
			Collateralized				Mortgage				Collateralized				Mortgage
			Debt				Servicing				Debt				Servicing
			Obligations				Rights				Obligations				Rights
	(in thousands)
	Beginning balance		$	1,317			$	2,298			$	755			$	1,484
	Transfers into Level 3		—				—				—				—
	Transfers out of Level 3		—				—				—				—
	Total gains (losses):
	Included in earnings		782				(243		)		(18		)		293
	Included in other comprehensive income		794				—				822				—
	Purchases, issuances, sales, and settlements:
	Purchases		—				—				—				—
	Issuances		—				253				—				521
	Sales		(2,893		)		—				—				—
	Settlements		—				—				(242		)		—
	Ending Balance		$	—			$	2,308			$	1,317			$	2,298
Fair Value, Measured on Recurring Basis, Gain (Loss) Included in Earnings [Table Text Block]	The following table presents the amount of gains and losses on Level 3 assets noted above which were included in earnings and other comprehensive income for the years ended December 31, 2014 and 2013 that are attributable to the change in unrealized gains and losses relating to those assets still held, and the line item in the consolidated financial statements in which they are included:
			For the Years Ended December 31,
			2014								2013
			Collateralized				Mortgage				Collateralized				Mortgage
			Debt				Servicing				Debt				Servicing
			Obligations				Rights				Obligations				Rights
	(in thousands)
	Total gains (losses) for the period in earnings*		$	—			$	10			$	(18	)		$	814
	Change in unrealized losses for the period included in other comprehensive income		—				—				822				—
	* Losses on collateralized debt obligations are included in gain on sale or call of available for sale securities, while gains on mortgage servicing rights are included in mortgage origination and loan servicing fees, both in the consolidated statements of operations.
Fair Value Measurements, Nonrecurring [Table Text Block]	The following table discloses the Company’s estimated fair value amounts of its financial instruments recorded at fair value on a nonrecurring basis. It is management’s belief that the fair values presented below are reasonable based on the valuation techniques and data available to the Company as of December 31, 2014 and 2013, as more fully described above.
		Fair Value Measurement at December 31, 2014 Using
	(in thousands)	Total			Quoted Prices in			Significant Other			Significant
					Active Markets for			Observable			Unobservable
					Identical Assets			Inputs			Inputs
					(Level 1)			(Level 2)			(Level 3)
	Assets:
	Collateral dependent impaired loans:
	Commercial and industrial	793			—			—			793
	Commercial real estate:
	Construction and development	49			—			—			49
	Farmland	52			—			—			52
	Commercial real estate-other	1,012			—			—			1,012
	Total commercial real estate	1,113			—			—			1,113
	Residential real estate:
	One- to four- family first liens	1,427			—			—			1,427
	One- to four- family junior liens	47			—			—			47
	Total residential real estate	1,474			—			—			1,474
	Consumer	32			—			—			32
	Collateral dependent impaired loans	3,412			—			—			3,412
	Other real estate owned	1,916			—			—			1,916
		Fair Value Measurement at December 31, 2013 Using
	(in thousands)	Total			Quoted Prices in			Significant Other			Significant
					Active Markets for			Observable			Unobservable
					Identical Assets			Inputs			Inputs
					(Level 1)			(Level 2)			(Level 3)
	Assets:
	Collateral dependent impaired loans:
	Commercial and industrial	1,043			—			—			1,043
	Commercial real estate:
	Construction and development	136			—			—			136
	Farmland	65			—			—			65
	Commercial real estate-other	1,786			—			—			1,786
	Total commercial real estate	1,987			—			—			1,987
	Residential real estate:
	One- to four- family first liens	186			—			—			186
	One- to four- family junior liens	30			—			—			30
	Total residential real estate	216			—			—			216
	Consumer	44			—			—			44
	Collateral dependent impaired loans	3,290			—			—			3,290
	Other real estate owned	1,770			—			—			1,770
Fair Value, by Balance Sheet Grouping [Table Text Block]	The following presents the carrying amount and estimated fair value of the financial instruments held by the Company at December 31, 2014 and 2013. The information presented is subject to change over time based on a variety of factors. The operations of the Company are managed on a going concern basis and not a liquidation basis. As a result, the ultimate value realized from the financial instruments presented could be substantially different when actually recognized over time through the normal course of operations. Additionally, a substantial portion of the Company’s inherent value is the Bank’s capitalization and franchise value. Neither of these components has been given consideration in the presentation of fair values below.
		December 31, 2014
		Carrying				Estimated				Quoted Prices in Active Markets for Identical Assets (Level 1)				Significant Other Observable Inputs (Level 2)			Significant Unobservable Inputs
		Amount				Fair Value											(Level 3)
	(in thousands)
	Financial assets:
	Cash and cash equivalents	$	23,409			$	23,409			$	23,409			$	—		$	—
	Investment securities:
	Available for sale	474,942				474,942				3,032				471,910			—
	Held to maturity	51,524				51,253				—				51,253			—
	Total investment securities	526,466				526,195				3,032				523,163			—
	Loans held for sale	801				812				—				—			812
	Loans, net:
	Agricultural	103,193				102,927				—				—			102,927
	Commercial and industrial	297,048				295,886				—				—			295,886
	Credit cards	1,206				1,206				—				—			1,206
	Overdrafts	610				610				—				—			610
	Commercial real estate:
	Construction and development	58,665				58,764				—				—			58,764
	Farmland	82,888				83,285				—				—			83,285
	Multifamily	54,516				54,356				—				—			54,356
	Commercial real estate-other	225,605				225,899				—				—			225,899
	Total commercial real estate	421,674				422,304				—				—			422,304
	Residential real estate:
	One- to four- family first liens	216,338				216,326				—				—			216,326
	One- to four- family junior liens	52,821				53,664				—				—			53,664
	Total residential real estate	269,159				269,990				—				—			269,990
	Consumer	23,266				23,362				—				—			23,362
	Total loans, net	1,116,156				1,116,285				—				—			1,116,285
	Loan pool participations, net	19,332				19,332				—				—			19,332
	Accrued interest receivable	10,898				10,898				10,898				—			—
	Federal Home Loan Bank stock	8,582				8,582				—				8,582			—
	Mortgage servicing rights	2,308				2,308				—				—			2,308
	Financial liabilities:
	Deposits:
	Non-interest-bearing demand	214,461				214,461				214,461				—			—
	Interest-bearing checking	618,540				618,540				618,540				—			—
	Savings	102,527				102,527				102,527				—			—
	Certificates of deposit under $100,000	235,395				235,401				—				235,401			—
	Certificates of deposit $100,000 and over	237,619				238,480				—				238,480			—
	Total deposits	1,408,542				1,409,409				935,528				473,881			—
	Federal funds purchased and securities sold under agreements to repurchase	78,229				78,229				78,229				—			—
	Federal Home Loan Bank borrowings	93,000				93,051				—				—			93,051
	Long-term debt	15,464				10,021				—				—			10,021
	Accrued interest payable	863				863				863				—			—
		December 31, 2013
		Carrying				Estimated				Quoted Prices in Active Markets for Identical Assets (Level 1)				Significant Other Observable Inputs (Level 2)			Significant Unobservable Inputs
		Amount				Fair Value											(Level 3)
	(in thousands)
	Financial assets:
	Cash and cash equivalents	$	24,890			$	24,890			$	24,890			$	—		$	—
	Investment securities:
	Available for sale	498,561				498,561				3,057				494,187			1,317
	Held to maturity	32,625				30,191				—				30,191			—
	Total investment securities	531,186				528,752				3,057				524,378			1,317
	Loans held for sale	357				367				—				—			367
	Loans, net:
	Agricultural	95,712				95,609				—				—			95,609
	Commercial and industrial	257,153				256,257				—				—			256,257
	Credit cards	998				998				—				—			998
	Overdrafts	415				415				—				—			415
	Commercial real estate:
	Construction and development	71,433				71,569				—				—			71,569
	Farmland	84,387				85,058				—				—			85,058
Multifamily	54,883				54,953				—				—			54,953
Commercial real estate-other	217,993				219,213				—				—			219,213
Total commercial real estate	428,696				430,793				—				—			430,793
Residential real estate:
One- to four- family first liens	217,765				218,257				—				—			218,257
One- to four- family junior liens	52,903				53,798				—				—			53,798
Total residential real estate	270,668				272,055				—				—			272,055
Consumer	18,591				18,638				—				—			18,638
Total loans, net	1,072,233				1,074,765				—				—			1,074,765
Loan pool participations, net	25,533				25,533				—				—			25,533
Accrued interest receivable	10,409				10,409				10,409				—			—
Federal Home Loan Bank stock	9,226				9,226				—				9,226			—
Financial liabilities:
Deposits:
Non-interest bearing demand	222,359				222,359				222,359				—			—
Interest-bearing checking	592,673				592,673				592,673				—			—
Savings	94,559				94,559				94,559				—			—
Certificates of deposit under $100,000	256,283				256,549				—				256,549			—
Certificates of deposit $100,000 and over	209,068				209,543				—				209,543			—
Total deposits	1,374,942				1,375,683				909,591				466,092			—
Federal funds purchased and securities sold under agreements to repurchase	66,665				66,665				66,665				—			—
Federal Home Loan Bank borrowings	106,900				107,356				—				—			107,356
Long-term debt	15,464				9,872				—				—			9,872
Accrued interest payable	765				765				765				—			—
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Table Text Block]	The following presents the valuation technique(s), observable inputs, and quantitative information about the unobservable inputs used for fair value measurements of the financial instruments held by the Company at December 31, 2014, categorized within Level 3 of the fair value hierarchy:
		Quantitative Information About Level 3 Fair Value Measurements
	(dollars in thousands)	Fair Value at December 31, 2014			Valuation Techniques(s)		Unobservable Input		Range of Inputs						Weighted Average
	Collateral dependent impaired loans:
	Commercial and industrial	793			Modified appraised value		Third party appraisal		NM *			NM *			NM *
							Appraisal discount		NM *			NM *			NM *
	Construction & development	49			Modified appraised value		Third party appraisal		NM *			NM *			NM *
							Appraisal discount		NM *			NM *			NM *
	Farmland	52			Modified appraised value		Third party appraisal		NM *			NM *			NM *
							Appraisal discount		NM *			NM *			NM *
	Commercial real estate-other	1,012			Modified appraised value		Third party appraisal		NM *			NM *			NM *
							Appraisal discount		NM *			NM *			NM *
	Residential real estate one- to four-	1,427			Modified appraised value		Third party appraisal		NM *			NM *			NM *
	family first liens						Appraisal discount		NM *			NM *			NM *
	Residential real estate one- to four-	47			Modified appraised value		Third party appraisal		NM *			NM *			NM *
	family junior liens						Appraisal discount		NM *			NM *			NM *
	Consumer	32			Modified appraised value		Third party appraisal		NM *			NM *			NM *
							Appraisal discount		NM *			NM *			NM *
	Mortgage servicing rights	2,308			Discounted cash flows		Constant prepayment rate		7.49	%		15.24	%		8.64	%
							Pretax discount rate		10	%		13	%		10.16	%
	Other real estate owned	1,916			Modified appraised value		Third party appraisal		NM *			NM *			NM *
							Appraisal discount		NM *			NM *			NM *
	* Not Meaningful. Third party appraisals are obtained as to the value of the underlying asset, but disclosure of this information would not provide meaningful information, as the range will vary widely from loan to loan. Types of discounts considered include age of the appraisal, local market conditions, current condition of the property, and estimated sales costs. These discounts will also vary from loan to loan, thus providing a range would not be meaningful.

Parent_Company_Only_Financial_1

Parent Company Only Financial Information (Tables)	12 Months Ended
	Dec. 31, 2014
Parent Company Only Financial Information [Abstract]
Schedule of Condensed Balance Sheet [Table Text Block]	The following is condensed financial information of MidWestOne Financial Group, Inc. as of December 31, 2014 and 2013 (parent company only):
		As of December 31,
		2014			2013
	(in thousands)
	Balance Sheets
	Assets:
	Cash	$	5,942		$	5,781
	Investment in subsidiaries	193,600			177,190
	Marketable equity securities, available for sale	2,066			2,111
	Loan pool participations, net	1,964			3,409
	Income tax receivable	—			75
	Deferred income taxes	425			729
	Other assets	5,010			4,447
	Total assets	$	209,007		$	193,742
	Liabilities and Shareholders’ Equity
	Liabilities:
	Long-term debt	$	15,464		$	15,464
	Other liabilities	812			262
	Total liabilities	16,276			15,726
	Shareholders’ equity:
	Capital stock, preferred	—			—
	Capital stock, common	8,690			8,690
	Additional paid-in capital	80,537			80,506
	Treasury stock	(6,945		)	(3,702		)
	Retained earnings	105,127			91,473
	Accumulated other comprehensive income	5,322			1,049
	Total shareholders’ equity	192,731			178,016
	Total liabilities and shareholders’ equity	$	209,007		$	193,742
Schedule of Condensed Income Statement [Table Text Block]	The following is condensed financial information of MidWestOne Financial Group, Inc. as of December 31, 2014, 2013, and 2012 (parent company only):
		Year Ended December 31,
		2014			2013			2012
	(in thousands)
	Statements of Income
	Dividends received from subsidiaries	$	8,500		$	4,006		$	5,520
	Interest income and dividends on marketable equity securities	49			33			168
	Interest and discount on loan pool participations	(293		)	(940		)	(2,149		)
	Investment securities gains	—			—			381
	Interest on long-term debt	(281		)	(296		)	(656		)
	Operating expenses	(2,351		)	(1,034		)	(1,064		)
	Income before income taxes and equity in subsidiaries’ undistributed income	5,624			1,769			2,200
	Income tax benefit	(807		)	(890		)	(1,355		)
	Income before equity in subsidiaries’ undistributed income	6,431			2,659			3,555
	Equity in subsidiaries’ undistributed income	12,091			15,948			12,979
	Net income	$	18,522		$	18,607		$	16,534
Schedule of Condensed Cash Flow Statement [Table Text Block]	The following is condensed financial information of MidWestOne Financial Group, Inc. as of December 31, 2014, 2013, and 2012 (parent company only):
		Year Ended December 31,
		2014			2013			2012
	(in thousands)
	Statements of Cash Flows
	Cash flows from operating activities:
	Net income	$	18,522		$	18,607		$	16,534
	Adjustments to reconcile net income to net cash provided by operating activities:
	Undistributed (earnings) loss of subsidiaries, net of dividends and distributions	(12,091		)	(15,948		)	(12,979		)
	Deferred income taxes	330			(583		)	(106		)
	Investment securities gain	—			—			(381		)
	Stock based compensation	493			384			266
	Increase in other assets	(488		)	(232		)	(158		)
	Increase (decrease) in other liabilities	550			(15		)	4
	Net cash provided by operating activities	7,316			2,213			3,180
	Cash flows from investing activities
	Proceeds from sales of investment securities	2			2			1,131
	Purchase of investment securities	(29		)	(24		)	(1,192		)
	Loan participation pools, net	1,445			2,719			5,834
	Net cash provided by investing activities	1,418			2,697			5,773
	Cash flows from financing activities:
	Stock options exercised	282			320			590
	Repurchase of common stock	(3,987		)	(967		)	(1,810		)
	Dividends paid	(4,868		)	(4,259		)	(3,054		)
	Net cash used in financing activities	(8,573		)	(4,906		)	(4,274		)
	Increase in cash	161			4			4,679
	Cash Balance:
	Beginning	5,781			5,777			1,098
	Ending	$	5,942		$	5,781		$	5,777

Quarterly_Results_of_Operation1

Quarterly Results of Operations (unaudited) (Tables)	12 Months Ended
	Dec. 31, 2014
Quarterly Results of Operations [Abstract]
Schedule of Quarterly Financial Information [Table Text Block]
		Three Months Ended
		31-Dec		30-Sep		30-Jun		31-Mar
	(in thousands, except per share amounts)
	2014
	Interest income	$	16,311	$	15,996	$	16,176	$	15,921
	Interest expense	2,407		2,429		2,321		2,394
	Net interest income	13,904		13,567		13,855		13,527
	Provision for loan losses	300		150		300		450
	Noninterest income	3,534		4,006		3,556		4,217
	Noninterest expense	11,563		10,819		10,639		10,392
	Income before income taxes	5,575		6,604		6,472		6,902
	Income tax expense	1,668		1,715		1,719		1,929
	Net income	$	3,907	$	4,889	$	4,753	$	4,973
	Net income per common share - basic	$	0.46	$	0.59	$	0.56	$	0.59
	Net income per common share - diluted	$	0.46	$	0.59	$	0.56	$	0.58
	2013
	Interest income	$	16,020	$	16,116	$	16,768	$	17,190
	Interest expense	2,723		2,851		3,159		3,399
	Net interest income	13,297		13,265		13,609		13,791
	Provision for loan losses	300		250		600		200
	Noninterest income	3,234		3,800		3,713		3,981
	Noninterest expense	10,225		10,283		10,585		10,994
	Income before income taxes	6,006		6,532		6,137		6,578
	Income tax expense	1,584		1,668		1,606		1,788
	Net income	$	4,422	$	4,864	$	4,531	$	4,790
	Net income per common share - basic	$	0.52	$	0.57	$	0.54	$	0.56
	Net income per common share - diluted	$	0.52	$	0.57	$	0.53	$	0.56

Nature_of_Business_and_Signifi4

Nature of Business and Significant Accounting Policies Premises and Equipment (Details)	12 Months Ended
	Dec. 31, 2014
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Depreciation Methods	Straight-line
Buildings and leasehold improvements | Minimum
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	10 years
Buildings and leasehold improvements | Maximum
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	30 years
Furniture and equipment | Minimum
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	3 years
Furniture and equipment | Maximum
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	10 years

Nature_of_Business_and_Signifi5

Nature of Business and Significant Accounting Policies Stock Repurchase (Details) (USD $)	12 Months Ended			18 Months Ended
In Millions, except Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Jun. 30, 2014	Oct. 18, 2011	Jan. 15, 2013	Jul. 17, 2014
Equity, Class of Treasury Stock [Line Items]
Stock Repurchased During Period, Shares	165,766	40,713	104,518
Common Stock [Member]
Equity, Class of Treasury Stock [Line Items]
Stock Repurchased During Period, Shares	165,766
Stock Repurchased During Period, Value	4
Common Stock [Member] | October 18 2011 Share Repurchase Program [Member]
Equity, Class of Treasury Stock [Line Items]
Stock Repurchase Program, Authorized Amount					5
Stock Repurchased During Period, Shares			104,518
Stock Repurchased During Period, Value			1.8
Stock Repurchase Program, Remaining Authorized Repurchase Amount			2.4
Common Stock [Member] | January 15 2013 Share Repurchase Program [Member]
Equity, Class of Treasury Stock [Line Items]
Stock Repurchase Program, Authorized Amount						5
Stock Repurchased During Period, Shares		40,713
Stock Repurchased During Period, Value		1		3.7
Common Stock [Member] | July 17 2014 Share Repurchase Program [Member]
Equity, Class of Treasury Stock [Line Items]
Stock Repurchase Program, Authorized Amount							5
Stock Repurchase Program, Remaining Authorized Repurchase Amount	3.8

Schedule_of_Cumulative_Other_C

Schedule of Cumulative Other Comprehensive Income (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Schedule of Cumulative Other Comprehensive Income [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax	$5,322	$1,049
Accumulated Other Comprehensive Income (Loss) [Member]
Schedule of Cumulative Other Comprehensive Income [Line Items]
Accumulated Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax	5,322	1,049	11,050
Accumulated Other Comprehensive Income (Loss), Net of Tax	$5,322	$1,049	$11,050

Schedule_of_Available_for_Sale

Schedule of Available for Sale Securities(Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Schedule of Available-for-sale Securities [Line Items]
Available for sale	$474,942	$498,561
U.S. Government agencies and corporations
Schedule of Available-for-sale Securities [Line Items]
Amortized cost basis	49,392	45,279
Gross unrealized gains	248	527
Gross unrealized losses	265	867
Available for sale	49,375	44,939
State and political subdivisions
Schedule of Available-for-sale Securities [Line Items]
Amortized cost basis	187,276	207,734
Gross unrealized gains	8,113	5,625
Gross unrealized losses	190	2,563
Available for sale	195,199	210,796
Mortgage-backed securities
Schedule of Available-for-sale Securities [Line Items]
Amortized cost basis	30,965	37,593
Gross unrealized gains	1,498	1,692
Gross unrealized losses	0	0
Available for sale	32,463	39,285
Collateralized mortgage obligations
Schedule of Available-for-sale Securities [Line Items]
Amortized cost basis	147,412	171,714
Gross unrealized gains	813	1,003
Gross unrealized losses	2,093	3,494
Available for sale	146,132	169,223
Collateralized debt obligations
Schedule of Available-for-sale Securities [Line Items]
Amortized cost basis		2,111
Gross unrealized gains		190
Gross unrealized losses		984
Available for sale		1,317
Corporate debt securities
Schedule of Available-for-sale Securities [Line Items]
Amortized cost basis	48,656	29,802
Gross unrealized gains	188	284
Gross unrealized losses	103	142
Available for sale	48,741	29,944
Total debt securities
Schedule of Available-for-sale Securities [Line Items]
Amortized cost basis	463,701	494,233
Gross unrealized gains	10,860	9,321
Gross unrealized losses	2,651	8,050
Available for sale	471,910	495,504
Equity securities
Schedule of Available-for-sale Securities [Line Items]
Amortized cost basis	2,686	2,659
Gross unrealized gains	380	453
Gross unrealized losses	34	55
Available for sale	3,032	3,057
Total investment securities
Schedule of Available-for-sale Securities [Line Items]
Amortized cost basis	466,387	496,892
Gross unrealized gains	11,240	9,774
Gross unrealized losses	2,685	8,105
Available for sale	$474,942	$498,561

Schedule_of_Held_to_Maturity_S

Schedule of Held to Maturity Securities (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Schedule of Held-to-maturity Securities [Line Items]
Held to maturity	$51,524	$32,625
Estimated fair value	51,253	30,191
State and political subdivisions
Schedule of Held-to-maturity Securities [Line Items]
Held to maturity	39,704	19,888
Gross unrealized gains	370
Gross unrealized losses	252	1,326
Estimated fair value	39,822	18,562
Mortgage-backed securities
Schedule of Held-to-maturity Securities [Line Items]
Held to maturity	22	28
Gross unrealized gains	3	3
Estimated fair value	25	31
Collateralized mortgage obligations
Schedule of Held-to-maturity Securities [Line Items]
Held to maturity	8,531	9,447
Gross unrealized losses	233	834
Estimated fair value	8,298	8,613
Corporate debt securities
Schedule of Held-to-maturity Securities [Line Items]
Held to maturity	3,267	3,262
Gross unrealized losses	159	277
Estimated fair value	3,108	2,985
Total investment securities
Schedule of Held-to-maturity Securities [Line Items]
Held to maturity	51,524	32,625
Gross unrealized gains	373	3
Gross unrealized losses	644	2,437
Estimated fair value	$51,253	$30,191

Available_for_Sale_Securities_

Available for Sale Securities in Continuous Loss Position (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified	count	count
U.S. Government agencies and corporations
Schedule of Available-for-sale Securities [Line Items]
Available for sale securities in unrealized loss positions, number of positions	4	3
Available for sale securities, continuous unrealized loss position, less than twelve months, estimated fair value	$9,946	$21,977
Available for sale securities, continuous unrealized loss position, less than 12 months, accumulated loss	11	867
Available for sale securities, continuous unrealized loss position, twelve months or longer, estimated fair value	15,018
Available for sale securities, continuous unrealized loss position, 12 months or longer, accumulated loss	254
Available for sale securities, continuous unrealized loss position, fair value	24,964	21,977
Available for sale securities, continuous unrealized loss position, accumulated loss	265	867
State and political subdivisions
Schedule of Available-for-sale Securities [Line Items]
Available for sale securities in unrealized loss positions, number of positions	46	171
Available for sale securities, continuous unrealized loss position, less than twelve months, estimated fair value	3,024	54,153
Available for sale securities, continuous unrealized loss position, less than 12 months, accumulated loss	18	2,331
Available for sale securities, continuous unrealized loss position, twelve months or longer, estimated fair value	10,728	1,799
Available for sale securities, continuous unrealized loss position, 12 months or longer, accumulated loss	172	232
Available for sale securities, continuous unrealized loss position, fair value	13,752	55,952
Available for sale securities, continuous unrealized loss position, accumulated loss	190	2,563
Collateralized mortgage obligations
Schedule of Available-for-sale Securities [Line Items]
Available for sale securities in unrealized loss positions, number of positions	14	18
Available for sale securities, continuous unrealized loss position, less than twelve months, estimated fair value	14,971	110,142
Available for sale securities, continuous unrealized loss position, less than 12 months, accumulated loss	123	3,164
Available for sale securities, continuous unrealized loss position, twelve months or longer, estimated fair value	68,370	5,047
Available for sale securities, continuous unrealized loss position, 12 months or longer, accumulated loss	1,970	330
Available for sale securities, continuous unrealized loss position, fair value	83,341	115,189
Available for sale securities, continuous unrealized loss position, accumulated loss	2,093	3,494
Collateralized debt obligations
Schedule of Available-for-sale Securities [Line Items]
Available for sale securities in unrealized loss positions, number of positions		3
Available for sale securities, continuous unrealized loss position, less than twelve months, estimated fair value		0
Available for sale securities, continuous unrealized loss position, twelve months or longer, estimated fair value		934
Available for sale securities, continuous unrealized loss position, 12 months or longer, accumulated loss		984
Available for sale securities, continuous unrealized loss position, fair value		934
Available for sale securities, continuous unrealized loss position, accumulated loss		984
Corporate debt securities
Schedule of Available-for-sale Securities [Line Items]
Available for sale securities in unrealized loss positions, number of positions	7	3
Available for sale securities, continuous unrealized loss position, less than twelve months, estimated fair value	23,024	7,430
Available for sale securities, continuous unrealized loss position, less than 12 months, accumulated loss	50	93
Available for sale securities, continuous unrealized loss position, twelve months or longer, estimated fair value	3,400	1,561
Available for sale securities, continuous unrealized loss position, 12 months or longer, accumulated loss	53	49
Available for sale securities, continuous unrealized loss position, fair value	26,424	8,991
Available for sale securities, continuous unrealized loss position, accumulated loss	103	142
Equity securities
Schedule of Available-for-sale Securities [Line Items]
Available for sale securities in unrealized loss positions, number of positions	1	1
Available for sale securities, continuous unrealized loss position, less than twelve months, estimated fair value		945
Available for sale securities, continuous unrealized loss position, less than 12 months, accumulated loss		55
Available for sale securities, continuous unrealized loss position, twelve months or longer, estimated fair value	966
Available for sale securities, continuous unrealized loss position, 12 months or longer, accumulated loss	34
Available for sale securities, continuous unrealized loss position, fair value	966	945
Available for sale securities, continuous unrealized loss position, accumulated loss	34	55
Total investment securities
Schedule of Available-for-sale Securities [Line Items]
Available for sale securities in unrealized loss positions, number of positions	72	199
Available for sale securities, continuous unrealized loss position, less than twelve months, estimated fair value	50,965	194,647
Available for sale securities, continuous unrealized loss position, less than 12 months, accumulated loss	202	6,510
Available for sale securities, continuous unrealized loss position, twelve months or longer, estimated fair value	98,482	9,341
Available for sale securities, continuous unrealized loss position, 12 months or longer, accumulated loss	2,483	1,595
Available for sale securities, continuous unrealized loss position, fair value	149,447	203,988
Available for sale securities, continuous unrealized loss position, accumulated loss	$2,685	$8,105

Held_to_Maturity_Securities_in

Held to Maturity Securities in Continuous Loss Position (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified	count	count
State and political subdivisions
Schedule of Held-to-maturity Securities [Line Items]
Held to maturity, securities in unrealized loss positions, qualitative disclosure, number of positions	29	30
Held to maturity securities, continuous unrealized loss position, less than twelve months, fair value	$5,322	$17,420
Held to maturity securities, continuous unrealized loss position, less than 12 months, accumulated loss	190	1,195
Held to maturity securities, continuous unrealized loss position, twelve months or longer, fair value	9,144	1,142
Held to maturity securities, continuous unrealized loss position, 12 months or longer, accumulated loss	62	131
Held to maturity securities, continuous unrealized loss position, fair value	14,466	18,562
Held to maturity securities, continuous unrealized loss position, accumulated loss	252	1,326
Collateralized mortgage obligations
Schedule of Held-to-maturity Securities [Line Items]
Held to maturity, securities in unrealized loss positions, qualitative disclosure, number of positions	1	1
Held to maturity securities, continuous unrealized loss position, less than twelve months, fair value		8,613
Held to maturity securities, continuous unrealized loss position, less than 12 months, accumulated loss		834
Held to maturity securities, continuous unrealized loss position, twelve months or longer, fair value	8,298
Held to maturity securities, continuous unrealized loss position, 12 months or longer, accumulated loss	233
Held to maturity securities, continuous unrealized loss position, fair value	8,298	8,613
Held to maturity securities, continuous unrealized loss position, accumulated loss	233	834
Corporate debt securities
Schedule of Held-to-maturity Securities [Line Items]
Held to maturity, securities in unrealized loss positions, qualitative disclosure, number of positions	2	2
Held to maturity securities, continuous unrealized loss position, less than twelve months, fair value	2,358	2,984
Held to maturity securities, continuous unrealized loss position, less than 12 months, accumulated loss	27	277
Held to maturity securities, continuous unrealized loss position, twelve months or longer, fair value	750
Held to maturity securities, continuous unrealized loss position, 12 months or longer, accumulated loss	132
Held to maturity securities, continuous unrealized loss position, fair value	3,108	2,984
Held to maturity securities, continuous unrealized loss position, accumulated loss	159	277
Total investment securities
Schedule of Held-to-maturity Securities [Line Items]
Held to maturity, securities in unrealized loss positions, qualitative disclosure, number of positions	32	33
Held to maturity securities, continuous unrealized loss position, less than twelve months, fair value	7,680	29,017
Held to maturity securities, continuous unrealized loss position, less than 12 months, accumulated loss	217	2,306
Held to maturity securities, continuous unrealized loss position, twelve months or longer, fair value	18,192	1,142
Held to maturity securities, continuous unrealized loss position, 12 months or longer, accumulated loss	427	131
Held to maturity securities, continuous unrealized loss position, fair value	25,872	30,159
Held to maturity securities, continuous unrealized loss position, accumulated loss	$644	$2,437

Credit_Losses_on_Fixed_Maturit

Credit Losses on Fixed Maturity Securities Recognized in Net Income (Details) (Available-for-sale Securities [Member], Collateralized debt obligations, USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Available-for-sale Securities [Member] | Collateralized debt obligations
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward]
Beginning balance	$6,639	$7,379
Reductions to credit losses:
Securities with previous other than temporary impairments, due to liquidation		-740
Securities with previous other than temporary impairments, due to sale	6,639
Ending balance	$0	$6,639

Investments_Classified_by_Cont

Investments Classified by Contractual Maturity (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Schedule of Available-for-sale Securities [Line Items]
Due in one year or less, amortized cost	$22,476
Due after one year through five years, amortized cost	122,371
Due after five years through ten years, amortized cost	102,908
Due after ten years, amortized cost	37,569
Debt securities without a single maturity date, amortized cost	178,377
Total, amortized cost	463,701
Due in one year or less, estimated fair value	22,637
Due after one year through five years, estimated fair value	124,385
Due after five years through ten years, estimated fair value	107,773
Due after ten years, estimated fair value	38,520
Debt securities without a single maturity date, estimated fair value	178,595
Total, estimated fair value	471,910
Held-to-maturity Securities, Debt Maturities [Abstract]
Due in one year or less, amortized cost	190
Due after one year through five years, amortized cost	2,750
Due after five years through ten years, amortized cost	17,829
Due after ten years, amortized cost	22,202
Debt securities without a single maturity date, amortized cost	8,553
Held to maturity	51,524	32,625
Due in one year or less, estimated fair value	189
Due after one year through five years, estimated fair value	2,723
Due after five years through ten years, estimated fair value	17,905
Due after ten years, estimated fair value	22,113
Debt securities without a single maturity date, estimated fair value	8,323
Estimated fair value	$51,253	$30,191

Investment_Securities_Realized

Investment Securities Realized Gains and Losses (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Debt securities
Gain (Loss) on Investments [Line Items]
Gross realized gains	$1,463	$144	$424
Gross realized losses	236	79
Other-than-temporary impairment			345
Total	1,227	65	79
Equity securities
Gain (Loss) on Investments [Line Items]
Gross realized gains			381
Other-than-temporary impairment		0
Total			381
Total investment securities
Gain (Loss) on Investments [Line Items]
Total	$1,227	$65	$460

Investment_Securities_Investme

Investment Securities Investment Securities Textual References (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
		count
Schedule of Available-for-sale Securities [Line Items]
Investment securities gains	$1,227,000	$65,000	$805,000
Available for sale	474,942,000	498,561,000
Available-for-sale securities pledged as collateral	200,700,000	202,800,000
Investment in Collateralized Debt Obligations, Number of Securities		5
Proceeds from sales of investment securities	33,457,000	12,447,000	18,307,000
Federal Home Loan Bank Stock	8,582,000	9,226,000
State and political subdivisions
Schedule of Available-for-sale Securities [Line Items]
Available for sale	195,199,000	210,796,000
Collateralized debt obligations
Schedule of Available-for-sale Securities [Line Items]
Investment securities gains	800,000
Available for sale		1,317,000
Investment in Collateralized Debt Obligations, Original Basis		8,800,000
Corporate debt securities
Schedule of Available-for-sale Securities [Line Items]
Available for sale	48,741,000	29,944,000
Equity securities
Schedule of Available-for-sale Securities [Line Items]
Available for sale	3,032,000	3,057,000
Other-than-temporary impairment		0
Fixed Income Funds [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale	1,000,000
IOWA | State and political subdivisions
Schedule of Available-for-sale Securities [Line Items]
Geographic Concentration of Investments Credit Risk	60.00%
Carrying Amount
Schedule of Available-for-sale Securities [Line Items]
Available for sale	474,942,000	498,561,000
Federal Home Loan Bank Stock	8,582,000	9,226,000
Banks, Trust and Insurance, Equities [Member] | Equity securities
Schedule of Available-for-sale Securities [Line Items]
Available for sale	$2,100,000

Allowance_for_Loan_Losses_and_

Allowance for Loan Losses and Recorded Investment in Loan Receivables (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
In Thousands, unless otherwise specified
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing receivable, allowance for credit losses, individually evaluated for impairment	$1,145	$1,423
Financing receivable, allowance for credit losses, collectively evaluated for impairment	15,218	14,756
Loans and leases receivable, allowance	16,363	16,179	15,957	15,676
Loans acquired with deteriorated credit quality (loan pool participations)	2,134	2,134
Financing Receivable [Abstract]
Financing receivable, individually evaluated for impairment	13,486	13,460
Financing receivable, collectively evaluated for impairment	1,119,033	1,074,952
Loans and leases receivable, gross	1,132,519	1,088,412
Loans acquired with deteriorated credit quality (loan pool participations)	21,466	27,667
Agricultural Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing receivable, allowance for credit losses, individually evaluated for impairment	88	125
Financing receivable, allowance for credit losses, collectively evaluated for impairment	1,418	1,233
Loans and leases receivable, allowance	1,506	1,358	1,026	1,209
Loans acquired with deteriorated credit quality (loan pool participations)		3
Financing Receivable [Abstract]
Financing receivable, individually evaluated for impairment	3,027	3,146
Financing receivable, collectively evaluated for impairment	101,782	94,021
Loans and leases receivable, gross	104,809	97,167
Loans acquired with deteriorated credit quality (loan pool participations)	4	49
Commercial Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing receivable, allowance for credit losses, individually evaluated for impairment	206	559
Financing receivable, allowance for credit losses, collectively evaluated for impairment	5,574	4,421
Loans and leases receivable, allowance	5,780	4,980	4,599	5,380
Loans acquired with deteriorated credit quality (loan pool participations)	70	64
Financing Receivable [Abstract]
Financing receivable, individually evaluated for impairment	3,168	3,521
Financing receivable, collectively evaluated for impairment	301,732	260,130
Loans and leases receivable, gross	304,900	263,651
Loans acquired with deteriorated credit quality (loan pool participations)	935	1,302
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing receivable, allowance for credit losses, individually evaluated for impairment	226	513
Financing receivable, allowance for credit losses, collectively evaluated for impairment	4,173	4,781
Loans and leases receivable, allowance	4,399	5,294	5,767	5,171
Loans acquired with deteriorated credit quality (loan pool participations)	669	627
Financing Receivable [Abstract]
Financing receivable, individually evaluated for impairment	3,916	5,079
Financing receivable, collectively evaluated for impairment	422,605	429,345
Loans and leases receivable, gross	426,521	434,424
Loans acquired with deteriorated credit quality (loan pool participations)	14,246	18,168
Residential Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing receivable, allowance for credit losses, individually evaluated for impairment	623	220
Financing receivable, allowance for credit losses, collectively evaluated for impairment	2,544	2,965
Loans and leases receivable, allowance	3,167	3,185	3,007	3,501
Loans acquired with deteriorated credit quality (loan pool participations)	82	88
Financing Receivable [Abstract]
Financing receivable, individually evaluated for impairment	3,341	1,664
Financing receivable, collectively evaluated for impairment	269,270	272,462
Loans and leases receivable, gross	272,611	274,126
Loans acquired with deteriorated credit quality (loan pool participations)	3,340	3,823
Consumer Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing receivable, allowance for credit losses, individually evaluated for impairment	2	6
Financing receivable, allowance for credit losses, collectively evaluated for impairment	321	269
Loans and leases receivable, allowance	323	275	356	167
Loans acquired with deteriorated credit quality (loan pool participations)	9	6
Financing Receivable [Abstract]
Financing receivable, individually evaluated for impairment	34	50
Financing receivable, collectively evaluated for impairment	23,644	18,994
Loans and leases receivable, gross	23,678	19,044
Loans acquired with deteriorated credit quality (loan pool participations)	12	18
Unallocated Financing Receivables [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing receivable, allowance for credit losses, collectively evaluated for impairment	1,188	1,087
Loans and leases receivable, allowance	1,188	1,087	1,202	248
Loans acquired with deteriorated credit quality (loan pool participations)	1,304	1,346
Financing Receivable [Abstract]
Loans acquired with deteriorated credit quality (loan pool participations)	$2,929	$4,307

Allowance_for_Loan_Loss_Activi

Allowance for Loan Loss Activity (Details) (USD $)	3 Months Ended								12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance				$16,179				$15,957	$16,179	$15,957	$15,676
Charge-offs									1,361	1,807	3,101
Recoveries									345	679	1,003
Provision	300	150	300	450	300	250	600	200	1,200	1,350	2,379
Ending balance	16,363				16,179				16,363	16,179	15,957
Agricultural Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance				1,358				1,026	1,358	1,026	1,209
Charge-offs									26	39
Recoveries									10	36	507
Provision									164	335	-690
Ending balance	1,506				1,358				1,506	1,358	1,026
Commercial Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance				4,980				4,599	4,980	4,599	5,380
Charge-offs									685	790	2,345
Recoveries									217	70	423
Provision									1,268	1,101	1,141
Ending balance	5,780				4,980				5,780	4,980	4,599
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance				5,294				5,767	5,294	5,767	5,171
Charge-offs									165	545	129
Recoveries									61	479	24
Provision									-791	-407	701
Ending balance	4,399				5,294				4,399	5,294	5,767
Residential Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance				3,185				3,007	3,185	3,007	3,501
Charge-offs									409	286	537
Recoveries									22	67	31
Provision									369	397	12
Ending balance	3,167				3,185				3,167	3,185	3,007
Consumer Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance				275				356	275	356	167
Charge-offs									76	147	90
Recoveries									35	27	18
Provision									89	39	261
Ending balance	323				275				323	275	356
Unallocated Financing Receivables [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance				1,087				1,202	1,087	1,202	248
Provision									101	-115	954
Ending balance	$1,188				$1,087				$1,188	$1,087	$1,202

New_Troubled_Debt_Restructurin

New Troubled Debt Restructurings During Period (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
	count		count		count
Financing Receivable, Modifications [Line Items]
Financing receivable, modifications, number of contracts	2		16		4
Financing receivable, modifications, pre-modification recorded investment	$1,690		$1,949		$3,161
Financing receivable, modifications, post-modification recorded investment	1,697		1,933		3,077
Interest Rate Reduction [Member] | Farmland Loan Financing Receivable [Member]
Financing Receivable, Modifications [Line Items]
Financing receivable, modifications, number of contracts					2	[1]
Financing receivable, modifications, pre-modification recorded investment					2,475	[1]
Financing receivable, modifications, post-modification recorded investment					2,388	[1]
Interest Rate Reduction [Member] | Residential Real Estate First Lien Loan Financing Receivable [Member]
Financing Receivable, Modifications [Line Items]
Financing receivable, modifications, number of contracts	1	[1]	2	[1]
Financing receivable, modifications, pre-modification recorded investment	285	[1]	164	[1]
Financing receivable, modifications, post-modification recorded investment	292	[1]	169	[1]
Interest Rate Reduction [Member] | Residential Real Estate Junior Lien Loan Financing Receivable [Member]
Financing Receivable, Modifications [Line Items]
Financing receivable, modifications, number of contracts			1	[1]	1	[1]
Financing receivable, modifications, pre-modification recorded investment			8	[1]	135	[1]
Financing receivable, modifications, post-modification recorded investment			13	[1]	138	[1]
Amortization or Maturity Date Change [Member] | Commercial and Industrial Loan Financing Receivable [Member]
Financing Receivable, Modifications [Line Items]
Financing receivable, modifications, number of contracts	1	[1]	10	[1]	1	[1]
Financing receivable, modifications, pre-modification recorded investment	1,405	[1]	1,546	[1]	551	[1]
Financing receivable, modifications, post-modification recorded investment	1,405	[1]	1,546	[1]	551	[1]
Amortization or Maturity Date Change [Member] | Commercial Real Estate Loan Other Financing Receivable [Member]
Financing Receivable, Modifications [Line Items]
Financing receivable, modifications, number of contracts			2	[1]
Financing receivable, modifications, pre-modification recorded investment			165	[1]
Financing receivable, modifications, post-modification recorded investment			136	[1]
Amortization or Maturity Date Change [Member] | Residential Real Estate First Lien Loan Financing Receivable [Member]
Financing Receivable, Modifications [Line Items]
Financing receivable, modifications, number of contracts			1	[1]
Financing receivable, modifications, pre-modification recorded investment			66	[1]
Financing receivable, modifications, post-modification recorded investment			$69	[1]
[1]	(1) TDRs may include multiple concessions and the disclosure classifications are based on the primary concession provided to the borrower.

New_Troubled_Debt_Restructurin1

New Troubled Debt Restructurings During Past Twelve Months That Defaulted During the Period (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013		Dec. 31, 2012
	count	count		count
Financing Receivable, Modifications [Line Items]
Financing receivable, modifications, subsequent default, number of contracts	0	2		1
Financing receivable, modifications, subsequent default, recorded investment	$0	$180		$547
Amortization or Maturity Date Change [Member] | Commercial and Industrial Loan Financing Receivable [Member]
Financing Receivable, Modifications [Line Items]
Financing receivable, modifications, subsequent default, number of contracts				1	[1]
Financing receivable, modifications, subsequent default, recorded investment				547	[1]
Amortization or Maturity Date Change [Member] | Commercial Real Estate Loan Other Financing Receivable [Member]
Financing Receivable, Modifications [Line Items]
Financing receivable, modifications, subsequent default, number of contracts		1	[1]
Financing receivable, modifications, subsequent default, recorded investment		69	[1]
Interest Rate Reduction [Member] | Residential Real Estate First Lien Loan Financing Receivable [Member]
Financing Receivable, Modifications [Line Items]
Financing receivable, modifications, subsequent default, number of contracts		1	[1]
Financing receivable, modifications, subsequent default, recorded investment		$111	[1]
[1]	(1) TDRs may include multiple concessions and the disclosure classifications are based on the primary concession provided to the borrower.

Loans_by_Internally_Assigned_C

Loans by Internally Assigned Credit Quality Indicators (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, net	$1,132,519	$1,088,412
Agricultural Loan Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, net	104,809	97,167
Commercial and Industrial Loan Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, net	303,108	262,368
Commercial Credit Card Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, net	1,246	1,028
Overdraft Deposit Account Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, net	744	537
Commercial Real Estate Construction and Development Loan Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, net	59,383	72,589
Farmland Loan Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, net	83,700	85,475
Multifamily Real Estate Loan Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, net	54,886	55,443
Commercial Real Estate Loan Other Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, net	228,552	220,917
Commercial Real Estate Total [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, net	426,521	434,424
Residential Real Estate First Lien Loan Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, net	219,314	220,668
Residential Real Estate Junior Lien Loan Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, net	53,297	53,458
Residential Real Estate Total
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, net	272,611	274,126
Consumer Other Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, net	23,480	18,762
Loans Aqcuired with Deteriorated Credit Quality Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, net	21,466	27,667
Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, net	1,067,427	1,015,076
Pass [Member] | Agricultural Loan Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, net	98,096	93,187
Pass [Member] | Commercial and Industrial Loan Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, net	273,290	239,485
Pass [Member] | Commercial Credit Card Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, net	1,240	1,010
Pass [Member] | Overdraft Deposit Account Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, net	373	326
Pass [Member] | Commercial Real Estate Construction and Development Loan Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, net	56,963	56,112
Pass [Member] | Farmland Loan Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, net	79,629	80,044
Pass [Member] | Multifamily Real Estate Loan Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, net	54,708	53,315
Pass [Member] | Commercial Real Estate Loan Other Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, net	215,268	205,914
Pass [Member] | Commercial Real Estate Total [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, net	406,568	395,385
Pass [Member] | Residential Real Estate First Lien Loan Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, net	211,390	213,815
Pass [Member] | Residential Real Estate Junior Lien Loan Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, net	53,039	53,225
Pass [Member] | Residential Real Estate Total
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, net	264,429	267,040
Pass [Member] | Consumer Other Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, net	23,431	18,643
Pass [Member] | Loans Aqcuired with Deteriorated Credit Quality Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, net	10,256	13,569
Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, net	31,080	48,571
Special Mention [Member] | Agricultural Loan Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, net	5,032	460
Special Mention [Member] | Commercial and Industrial Loan Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, net	7,468	11,097
Special Mention [Member] | Commercial Credit Card Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, net	6	1
Special Mention [Member] | Overdraft Deposit Account Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, net	262	123
Special Mention [Member] | Commercial Real Estate Construction and Development Loan Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, net	1,151	14,984
Special Mention [Member] | Farmland Loan Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, net	1,778	3,091
Special Mention [Member] | Multifamily Real Estate Loan Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, net	178	1,732
Special Mention [Member] | Commercial Real Estate Loan Other Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, net	11,216	12,994
Special Mention [Member] | Commercial Real Estate Total [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, net	14,323	32,801
Special Mention [Member] | Residential Real Estate First Lien Loan Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, net	3,933	3,994
Special Mention [Member] | Residential Real Estate Junior Lien Loan Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, net	48	38
Special Mention [Member] | Residential Real Estate Total
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, net	3,981	4,032
Special Mention [Member] | Consumer Other Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, net	8	57
Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, net	34,012	24,765
Substandard [Member] | Agricultural Loan Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, net	1,681	3,520
Substandard [Member] | Commercial and Industrial Loan Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, net	22,350	11,786
Substandard [Member] | Commercial Credit Card Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, net		17
Substandard [Member] | Overdraft Deposit Account Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, net	109	88
Substandard [Member] | Commercial Real Estate Construction and Development Loan Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, net	1,269	1,493
Substandard [Member] | Farmland Loan Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, net	2,293	2,340
Substandard [Member] | Multifamily Real Estate Loan Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, net		396
Substandard [Member] | Commercial Real Estate Loan Other Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, net	2,068	2,009
Substandard [Member] | Commercial Real Estate Total [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, net	5,630	6,238
Substandard [Member] | Residential Real Estate First Lien Loan Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, net	3,991	2,859
Substandard [Member] | Residential Real Estate Junior Lien Loan Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, net	210	195
Substandard [Member] | Residential Real Estate Total
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, net	4,201	3,054
Substandard [Member] | Consumer Other Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, net	41	62
Substandard [Member] | Loans Aqcuired with Deteriorated Credit Quality Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, net	11,202	14,093
Unlikely to be Collected Financing Receivable [Member] | Loans Aqcuired with Deteriorated Credit Quality Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, net	$8	$5

Amounts_and_Categories_of_Impa

Amounts and Categories of Impaired Loans (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Financing Receivable, Impaired [Line Items]
Impaired financing receivable, with no related allowance, recorded investment	$7,512,000	$4,888,000
Impaired financing receivable, with no related allowance, unpaid principal balance	8,805,000	6,132,000
Impaired financing receivable, with related allowance, recorded investment	5,974,000	8,572,000
Impaired financing receivable, with related allowance, unpaid principal balance	5,974,000	8,992,000
Impaired financing receivable, related allowance	1,145,000	1,423,000
Impaired financing receivable, recorded investment	13,486,000	13,460,000
Impaired financing receivable, unpaid principal balance	14,779,000	15,124,000
Impaired financing receivable, with no related allowance, average recorded investment	7,648,000	4,727,000	4,936,000
Impaired financing receivable, with no related allowance, interest income, accrual method	862,000	259,000	199,000
Impaired financing receivable, with related allowance, average recorded investment	6,048,000	8,663,000	7,093,000
Impaired financing receivable, with related allowance, interest income, accrual method	564,000	332,000	285,000
Impaired financing receivable, average recorded investment	13,696,000	13,390,000	12,029,000
Impaired financing receivable, interest income, accrual method	1,426,000	591,000	484,000
Loans and leases receivable, impaired, commitment to lend	0
Agricultural Loan Financing Receivable [Member]
Financing Receivable, Impaired [Line Items]
Impaired financing receivable, with no related allowance, recorded investment	1,410,000	1,475,000
Impaired financing receivable, with no related allowance, unpaid principal balance	1,910,000	1,975,000
Impaired financing receivable, with related allowance, recorded investment	1,617,000	1,671,000
Impaired financing receivable, with related allowance, unpaid principal balance	1,617,000	1,671,000
Impaired financing receivable, related allowance	88,000	125,000
Impaired financing receivable, recorded investment	3,027,000	3,146,000
Impaired financing receivable, unpaid principal balance	3,527,000	3,646,000
Impaired financing receivable, with no related allowance, average recorded investment	1,413,000	1,128,000	1,600,000
Impaired financing receivable, with no related allowance, interest income, accrual method	211,000	114,000	60,000
Impaired financing receivable, with related allowance, average recorded investment	1,627,000	1,681,000	1,723,000
Impaired financing receivable, with related allowance, interest income, accrual method	203,000	51,000	50,000
Impaired financing receivable, average recorded investment	3,040,000	2,809,000	3,323,000
Impaired financing receivable, interest income, accrual method	414,000	165,000	110,000
Commercial and Industrial Loan Financing Receivable [Member]
Financing Receivable, Impaired [Line Items]
Impaired financing receivable, with no related allowance, recorded investment	2,169,000	1,919,000
Impaired financing receivable, with no related allowance, unpaid principal balance	2,270,000	2,020,000
Impaired financing receivable, with related allowance, recorded investment	999,000	1,602,000
Impaired financing receivable, with related allowance, unpaid principal balance	999,000	1,657,000
Impaired financing receivable, related allowance	206,000	559,000
Impaired financing receivable, recorded investment	3,168,000	3,521,000
Impaired financing receivable, unpaid principal balance	3,269,000	3,677,000
Impaired financing receivable, with no related allowance, average recorded investment	2,234,000	2,025,000	965,000
Impaired financing receivable, with no related allowance, interest income, accrual method	160,000	76,000	52,000
Impaired financing receivable, with related allowance, average recorded investment	1,044,000	1,697,000	1,044,000
Impaired financing receivable, with related allowance, interest income, accrual method	104,000	75,000	36,000
Impaired financing receivable, average recorded investment	3,278,000	3,722,000	2,009,000
Impaired financing receivable, interest income, accrual method	264,000	151,000	88,000
Commercial Real Estate Construction and Development Loan Financing Receivable [Member]
Financing Receivable, Impaired [Line Items]
Impaired financing receivable, with no related allowance, recorded investment	49,000	132,000
Impaired financing receivable, with no related allowance, unpaid principal balance	176,000	601,000
Impaired financing receivable, with related allowance, recorded investment	34,000	7,000
Impaired financing receivable, with related allowance, unpaid principal balance	34,000	7,000
Impaired financing receivable, related allowance	34,000	3,000
Impaired financing receivable, recorded investment	83,000	139,000
Impaired financing receivable, unpaid principal balance	210,000	608,000
Impaired financing receivable, with no related allowance, average recorded investment	49,000	149,000	316,000
Impaired financing receivable, with no related allowance, interest income, accrual method		21,000
Impaired financing receivable, with related allowance, average recorded investment	35,000	7,000	526,000
Impaired financing receivable, with related allowance, interest income, accrual method	3,000		30,000
Impaired financing receivable, average recorded investment	84,000	156,000	842,000
Impaired financing receivable, interest income, accrual method	3,000	21,000	30,000
Farmland Loan Financing Receivable [Member]
Financing Receivable, Impaired [Line Items]
Impaired financing receivable, with no related allowance, recorded investment	2,270,000	93,000
Impaired financing receivable, with no related allowance, unpaid principal balance	2,433,000	107,000
Impaired financing receivable, with related allowance, recorded investment	74,000	2,311,000
Impaired financing receivable, with related allowance, unpaid principal balance	74,000	2,461,000
Impaired financing receivable, related allowance	4,000	219,000
Impaired financing receivable, recorded investment	2,344,000	2,404,000
Impaired financing receivable, unpaid principal balance	2,507,000	2,568,000
Impaired financing receivable, with no related allowance, average recorded investment	2,288,000	101,000	83,000
Impaired financing receivable, with no related allowance, interest income, accrual method	456,000	8,000	8,000
Impaired financing receivable, with related allowance, average recorded investment	74,000	2,315,000	2,504,000
Impaired financing receivable, with related allowance, interest income, accrual method	3,000	110,000	114,000
Impaired financing receivable, average recorded investment	2,362,000	2,416,000	2,587,000
Impaired financing receivable, interest income, accrual method	459,000	118,000	122,000
Commercial Real Estate Loan Other Financing Receivable [Member]
Financing Receivable, Impaired [Line Items]
Impaired financing receivable, with no related allowance, recorded investment	939,000	587,000
Impaired financing receivable, with no related allowance, unpaid principal balance	1,064,000	612,000
Impaired financing receivable, with related allowance, recorded investment	550,000	1,949,000
Impaired financing receivable, with related allowance, unpaid principal balance	550,000	2,164,000
Impaired financing receivable, related allowance	188,000	291,000
Impaired financing receivable, recorded investment	1,489,000	2,536,000
Impaired financing receivable, unpaid principal balance	1,614,000	2,776,000
Impaired financing receivable, with no related allowance, average recorded investment	975,000	593,000	1,770,000
Impaired financing receivable, with no related allowance, interest income, accrual method	-3,000	25,000	72,000
Impaired financing receivable, with related allowance, average recorded investment	551,000	1,921,000	559,000
Impaired financing receivable, with related allowance, interest income, accrual method	43,000	55,000	18,000
Impaired financing receivable, average recorded investment	1,526,000	2,514,000	2,329,000
Impaired financing receivable, interest income, accrual method	40,000	80,000	90,000
Commercial Real Estate Total [Member]
Financing Receivable, Impaired [Line Items]
Impaired financing receivable, with no related allowance, recorded investment	3,258,000	812,000
Impaired financing receivable, with no related allowance, unpaid principal balance	3,673,000	1,320,000
Impaired financing receivable, with related allowance, recorded investment	658,000	4,267,000
Impaired financing receivable, with related allowance, unpaid principal balance	658,000	4,632,000
Impaired financing receivable, related allowance	226,000	513,000
Impaired financing receivable, recorded investment	3,916,000	5,079,000
Impaired financing receivable, unpaid principal balance	4,331,000	5,952,000
Impaired financing receivable, with no related allowance, average recorded investment	3,312,000	843,000	2,169,000
Impaired financing receivable, with no related allowance, interest income, accrual method	453,000	54,000	80,000
Impaired financing receivable, with related allowance, average recorded investment	660,000	4,243,000	3,589,000
Impaired financing receivable, with related allowance, interest income, accrual method	49,000	165,000	162,000
Impaired financing receivable, average recorded investment	3,972,000	5,086,000	5,758,000
Impaired financing receivable, interest income, accrual method	502,000	219,000	242,000
Residential Real Estate First Lien Loan Financing Receivable [Member]
Financing Receivable, Impaired [Line Items]
Impaired financing receivable, with no related allowance, recorded investment	535,000	622,000
Impaired financing receivable, with no related allowance, unpaid principal balance	773,000	741,000
Impaired financing receivable, with related allowance, recorded investment	2,600,000	902,000
Impaired financing receivable, with related allowance, unpaid principal balance	2,600,000	902,000
Impaired financing receivable, related allowance	594,000	170,000
Impaired financing receivable, recorded investment	3,135,000	1,524,000
Impaired financing receivable, unpaid principal balance	3,373,000	1,643,000
Impaired financing receivable, with no related allowance, average recorded investment	547,000	669,000	143,000
Impaired financing receivable, with no related allowance, interest income, accrual method	32,000	14,000	4,000
Impaired financing receivable, with related allowance, average recorded investment	2,612,000	909,000	645,000
Impaired financing receivable, with related allowance, interest income, accrual method	203,000	38,000	33,000
Impaired financing receivable, average recorded investment	3,159,000	1,578,000	788,000
Impaired financing receivable, interest income, accrual method	235,000	52,000	37,000
Residential Real Estate Junior Lien Loan Financing Receivable [Member]
Financing Receivable, Impaired [Line Items]
Impaired financing receivable, with no related allowance, recorded investment	134,000	50,000
Impaired financing receivable, with no related allowance, unpaid principal balance	157,000	50,000
Impaired financing receivable, with related allowance, recorded investment	72,000	90,000
Impaired financing receivable, with related allowance, unpaid principal balance	72,000	90,000
Impaired financing receivable, related allowance	29,000	50,000
Impaired financing receivable, recorded investment	206,000	140,000
Impaired financing receivable, unpaid principal balance	229,000	140,000
Impaired financing receivable, with no related allowance, average recorded investment	134,000	50,000	43,000
Impaired financing receivable, with no related allowance, interest income, accrual method	6,000	1,000	3,000
Impaired financing receivable, with related allowance, average recorded investment	74,000	92,000	68,000
Impaired financing receivable, with related allowance, interest income, accrual method		1,000	2,000
Impaired financing receivable, average recorded investment	208,000	142,000	111,000
Impaired financing receivable, interest income, accrual method	6,000	2,000	5,000
Residential Real Estate Total
Financing Receivable, Impaired [Line Items]
Impaired financing receivable, with no related allowance, recorded investment	669,000	672,000
Impaired financing receivable, with no related allowance, unpaid principal balance	930,000	791,000
Impaired financing receivable, with related allowance, recorded investment	2,672,000	992,000
Impaired financing receivable, with related allowance, unpaid principal balance	2,672,000	992,000
Impaired financing receivable, related allowance	623,000	220,000
Impaired financing receivable, recorded investment	3,341,000	1,664,000
Impaired financing receivable, unpaid principal balance	3,602,000	1,783,000
Impaired financing receivable, with no related allowance, average recorded investment	681,000	719,000	186,000
Impaired financing receivable, with no related allowance, interest income, accrual method	38,000	15,000	7,000
Impaired financing receivable, with related allowance, average recorded investment	2,686,000	1,001,000	713,000
Impaired financing receivable, with related allowance, interest income, accrual method	203,000	39,000	35,000
Impaired financing receivable, average recorded investment	3,367,000	1,720,000	899,000
Impaired financing receivable, interest income, accrual method	241,000	54,000	42,000
Consumer Other Financing Receivable [Member]
Financing Receivable, Impaired [Line Items]
Impaired financing receivable, with no related allowance, recorded investment	6,000	10,000
Impaired financing receivable, with no related allowance, unpaid principal balance	22,000	26,000
Impaired financing receivable, with related allowance, recorded investment	28,000	40,000
Impaired financing receivable, with related allowance, unpaid principal balance	28,000	40,000
Impaired financing receivable, related allowance	2,000	6,000
Impaired financing receivable, recorded investment	34,000	50,000
Impaired financing receivable, unpaid principal balance	50,000	66,000
Impaired financing receivable, with no related allowance, average recorded investment	8,000	12,000	16,000
Impaired financing receivable, with related allowance, average recorded investment	31,000	41,000	24,000
Impaired financing receivable, with related allowance, interest income, accrual method	5,000	2,000	2,000
Impaired financing receivable, average recorded investment	39,000	53,000	40,000
Impaired financing receivable, interest income, accrual method	$5,000	$2,000	$2,000

Past_Due_Loan_Aging_Details

Past Due Loan Aging (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 - 59 Days Past Due	$3,354	$3,627
60 - 89 Days Past Due	1,332	2,060
90 Days or More Past Due	4,040	4,463
Total Past Due	8,726	10,150
Current	1,123,793	1,078,262
Total Loans Receivable	1,132,519	1,088,412
90 Days Past Due and Still Accruing	848	1,385
Agricultural Loan Financing Receivable [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 - 59 Days Past Due	58	65
60 - 89 Days Past Due	30	23
90 Days or More Past Due		52
Total Past Due	88	140
Current	104,721	97,027
Total Loans Receivable	104,809	97,167
Commercial and Industrial Loan Financing Receivable [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 - 59 Days Past Due	897	610
60 - 89 Days Past Due	603	876
90 Days or More Past Due	515	960
Total Past Due	2,015	2,446
Current	301,093	259,922
Total Loans Receivable	303,108	262,368
90 Days Past Due and Still Accruing	66	213
Commercial Credit Card Financing Receivable [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 - 59 Days Past Due	3
60 - 89 Days Past Due	3	1
90 Days or More Past Due		17
Total Past Due	6	18
Current	1,240	1,010
Total Loans Receivable	1,246	1,028
90 Days Past Due and Still Accruing		17
Overdraft Deposit Account Financing Receivable [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 - 59 Days Past Due	104	40
60 - 89 Days Past Due	2	1
90 Days or More Past Due	4	48
Total Past Due	110	89
Current	634	448
Total Loans Receivable	744	537
Commercial Real Estate Construction and Development Loan Financing Receivable [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 - 59 Days Past Due		84
90 Days or More Past Due	83	56
Total Past Due	83	140
Current	59,300	72,449
Total Loans Receivable	59,383	72,589
Farmland Loan Financing Receivable [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 - 59 Days Past Due	503
Total Past Due	503
Current	83,197	85,475
Total Loans Receivable	83,700	85,475
Multifamily Real Estate Loan Financing Receivable [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
90 Days or More Past Due		395
Total Past Due		395
Current	54,886	55,048
Total Loans Receivable	54,886	55,443
90 Days Past Due and Still Accruing		395
Commercial Real Estate Loan Other Financing Receivable [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 - 59 Days Past Due	168	604
60 - 89 Days Past Due	57	190
90 Days or More Past Due	1,200	1,740
Total Past Due	1,425	2,534
Current	227,127	218,383
Total Loans Receivable	228,552	220,917
90 Days Past Due and Still Accruing		164
Commercial Real Estate Total [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 - 59 Days Past Due	671	688
60 - 89 Days Past Due	57	190
90 Days or More Past Due	1,283	2,191
Total Past Due	2,011	3,069
Current	424,510	431,355
Total Loans Receivable	426,521	434,424
90 Days Past Due and Still Accruing		559
Residential Real Estate First Lien Loan Financing Receivable [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 - 59 Days Past Due	1,481	1,891
60 - 89 Days Past Due	581	869
90 Days or More Past Due	2,023	984
Total Past Due	4,085	3,744
Current	215,229	216,924
Total Loans Receivable	219,314	220,668
90 Days Past Due and Still Accruing	780	540
Residential Real Estate Junior Lien Loan Financing Receivable [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 - 59 Days Past Due	105	316
60 - 89 Days Past Due	48	38
90 Days or More Past Due	192	175
Total Past Due	345	529
Current	52,952	52,929
Total Loans Receivable	53,297	53,458
90 Days Past Due and Still Accruing		49
Residential Real Estate Total
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 - 59 Days Past Due	1,586	2,207
60 - 89 Days Past Due	629	907
90 Days or More Past Due	2,215	1,159
Total Past Due	4,430	4,273
Current	268,181	269,853
Total Loans Receivable	272,611	274,126
90 Days Past Due and Still Accruing	780	589
Consumer Other Financing Receivable [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 - 59 Days Past Due	35	17
60 - 89 Days Past Due	8	62
90 Days or More Past Due	23	36
Total Past Due	66	115
Current	23,414	18,647
Total Loans Receivable	23,480	18,762
90 Days Past Due and Still Accruing	$2	$7

Nonaccrual_Loans_Details

Nonaccrual Loans (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Nonaccrual Status	$3,255	$3,240
Agricultural Loan Financing Receivable [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Nonaccrual Status		52
Commercial and Industrial Loan Financing Receivable [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Nonaccrual Status	479	746
Commercial Real Estate Construction and Development Loan Financing Receivable [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Nonaccrual Status	83	139
Farmland Loan Financing Receivable [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Nonaccrual Status	24	29
Commercial Real Estate Loan Other Financing Receivable [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Nonaccrual Status	1,200	1,576
Commercial Real Estate Total [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Nonaccrual Status	1,307	1,744
Residential Real Estate First Lien Loan Financing Receivable [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Nonaccrual Status	1,261	543
Residential Real Estate Junior Lien Loan Financing Receivable [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Nonaccrual Status	192	126
Residential Real Estate Total
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Nonaccrual Status	1,453	669
Consumer Other Financing Receivable [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Nonaccrual Status	$16	$29

Loans_Receivable_and_the_Allow3

Loans Receivable and the Allowance for Loan Losses Textual References (Details) (USD $)	Dec. 31, 2014
In Millions, unless otherwise specified	quarters
Financing Receivable, Allowance for Credit Losses [Line Items]
Pledged Financial Instruments, Not Separately Reported, Loans Receivable, for Federal Home Loan Bank Debt	$404.40
Allowance for Loan Losses, Unallocated Maximum Overage Percentage	15.00%
Allowance for Loan Losses, Unallocated Maximum Shortage Percentage	5.00%
Loans Reviewed Collectively for Impairment, Historical Loss Lookback, Number of Quarters	20
Special Mention Loans, Allowance for Loan Loss Pass Allocation Multiple	2
Substandard Loans, Allowance for Loan Loss Pass Allocation Multiple	6

Loan_Pool_Participations_Detai

Loan Pool Participations (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Loan Pool Participations [Abstract]
Balance at beginning of year	$25,533	$35,650
Principal payments	4,724	8,687
Net charge-offs	1,477	1,430
Balance at end of year	19,332	25,533
Loan pool participations, face value	$68,376	$80,902

Certain_Loans_Acquired_in_Tran

Certain Loans Acquired in Transfer Not Accounted for as Debt Securities (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities [Abstract]
Commercial	$477	$502
Real estate loans: [Abstract]
One- to four- family residential real estate,	201	229
Other commercial real estate	1,930	2,320
Total real estate	2,131	2,549
Total	2,608	3,051
Allowance	-56	-48
Carrying amount, net of allowance	$2,552	$3,003

Certain_Loans_Acquired_in_Tran1

Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]
Balance at beginning of year	$2,244	$2,627
Accretions	-665	-383
Balance at end of year	1,579	2,244
Cash flows expected to be collected at acquisition	7,913	8,128
Basis in acquired loans at acquisition	$4,482	$4,638

Loan_Pool_Participations_Textu

Loan Pool Participations Textual References (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified	count
Loan Pool Participations [Abstract]
Criteria to Apply ASC Topic 310, Number	6
Loan Pool Participations Less Than 90 Days Past Due, Percentage	70.00%
Loan Pool Participations 90 Days or More Past Due, Percentage	30.00%
Loan Pool Participations Not Subject to Accretable Yield, Face Value	$65	$76.90
Loan Pool Participations Receivable Not Subject to Accretable Yield, Gross Amount	$18.90	$24.60

Premises_and_Equipment_Details

Premises and Equipment (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Property, Plant and Equipment [Line Items]
Premises and equipment	$62,689,000	$52,629,000
Accumulated depreciation and amortization	24,919,000	24,947,000
Premises and equipment, net	37,770,000	27,682,000
Depreciation expense	2,200,000	2,400,000	2,300,000
Land
Property, Plant and Equipment [Line Items]
Premises and equipment	4,836,000	4,836,000
Buildings and leasehold improvements
Property, Plant and Equipment [Line Items]
Premises and equipment	29,942,000	30,278,000
Furniture and equipment
Property, Plant and Equipment [Line Items]
Premises and equipment	13,206,000	13,741,000
Construction in Progress [Member]
Property, Plant and Equipment [Line Items]
Premises and equipment	$14,705,000	$3,774,000

Schedule_of_Intangible_Assets_

Schedule of Intangible Assets (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Schedule of Intangible Assets [Line Items]
Gross carrying amount	$14,123	$14,123
Accumulated amortization	5,864	5,317
Unamortized intangible assets	8,259	8,806
Impairment of intangible assets, indefinite-lived	0	0	0
Insurance agency intangible
Schedule of Intangible Assets [Line Items]
Finite-lived intangible asset, weighted average useful life	7 years	8 years
Gross carrying amount	1,320	1,320
Accumulated amortization	956	850
Unamortized intangible assets	364	470
Core deposit premium
Schedule of Intangible Assets [Line Items]
Finite-lived intangible asset, weighted average useful life	4 years	5 years
Gross carrying amount	5,433	5,433
Accumulated amortization	4,742	4,322
Unamortized intangible assets	691	1,111
Customer list intangible
Schedule of Intangible Assets [Line Items]
Finite-lived intangible asset, weighted average useful life	9 years	10 years
Gross carrying amount	330	330
Accumulated amortization	166	145
Unamortized intangible assets	164	185
Trade Names [Member]
Schedule of Intangible Assets [Line Items]
Gross carrying amount	7,040	7,040
Unamortized intangible assets	$7,040	$7,040

Schedule_of_FiniteLived_Intang

Schedule of Finite-Lived Intangible Assets, Future Amortization Expense (Details) (USD $)	Dec. 31, 2014
In Thousands, unless otherwise specified
Finite-Lived Intangible Assets [Line Items]
Amortization expense, next twelve months	$431
Amortization expense, year two	314
Amortization expense, year three	197
Amortization expense, year four	81
Amortization expense, year five	38
Amortization expense, after year five	158
Total	1,219
Insurance agency intangible
Finite-Lived Intangible Assets [Line Items]
Amortization expense, next twelve months	89
Amortization expense, year two	72
Amortization expense, year three	55
Amortization expense, year four	38
Amortization expense, year five	21
Amortization expense, after year five	89
Total	364
Core deposit premium
Finite-Lived Intangible Assets [Line Items]
Amortization expense, next twelve months	321
Amortization expense, year two	222
Amortization expense, year three	123
Amortization expense, year four	25
Amortization expense, year five	0
Amortization expense, after year five	0
Total	691
Customer list intangible
Finite-Lived Intangible Assets [Line Items]
Amortization expense, next twelve months	21
Amortization expense, year two	20
Amortization expense, year three	19
Amortization expense, year four	18
Amortization expense, year five	17
Amortization expense, after year five	69
Total	$164

Other_Assets_Details

Other Assets (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Other Assets [Abstract]
Federal Home Loan Bank Stock	$8,582	$9,226
Prepaid expenses	1,350	1,030
Mortgage servicing rights	2,308	2,298
Accounts receivable & other miscellaneous assets	1,835	2,006
Total other assets	$14,075	$14,560

Loans_Serviced_for_Others_Deta

Loans Serviced for Others (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Components of Managed Servicing Portfolio [Abstract]
Loans serviced for others	$370	$362.90

Time_Deposits_Fiscal_Year_Matu

Time Deposits, Fiscal Year Maturity (Details) (USD $)	Dec. 31, 2014
In Thousands, unless otherwise specified
Time Deposits, Fiscal Year Maturity [Abstract]
2014	$267,510
2015	127,149
2016	60,174
2017	9,004
2018	9,177
Time Deposits	$473,014

Time_Deposits_Time_Deposit_Tex

Time Deposits Time Deposit Textual References (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Time Deposits [Abstract]
Time Deposits, $250,000 or More	$150.20
Domestic time deposit, brokered	$6.10	$12.90

Shortterm_Borrowings_Details

Short-term Borrowings (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Short-term Debt [Line Items]
Available-for-sale securities pledged as collateral	$200.70	$202.80
Federal Reserve Bank Advances [Member]
Short-term Debt [Line Items]
Short-term debt	0	0
Line of credit facility, maximum borrowing capacity	11.8	11.4
Available-for-sale securities pledged as collateral	13.1
Federal Funds Purchased [Member]
Short-term Debt [Line Items]
Short-term debt	17.4	5.5
Securities Sold under Agreements to Repurchase [Member]
Short-term Debt [Line Items]
Short-term debt	$60.80	$61.20
Short-term debt, weighted average interest rate	0.21%	0.21%

Federal_Home_Loan_Bank_Borrowi2

Federal Home Loan Bank Borrowings and Long-Term Debt (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Federal Home Loan Bank, Advances, Fiscal Year Maturity [Abstract]
Due in next twelve months	$20,000	$39,900
Due in year two	17,000	20,000
Due in year three	10,000	17,000
Due in year four	17,000	10,000
Due in year five	17,000	5,000
Due after year five	12,000	15,000
Total Federal Home Loan Bank borrowings	$93,000	$106,900
Maximum
Federal Home Loan Bank, Advances, Fiscal Year Maturity [Abstract]
Average interest rate of amounts due within one year	3.00%	3.40%
Average interest rate, due in one to two years	2.46%	3.00%
Average interest rate, due in two to three years	2.78%	2.46%
Average interest rate, due in three to four years	1.83%	2.78%
Average interest rate, due in four to five years	1.85%	1.30%
Average interest rate, due after five years	2.25%	1.75%
Minimum
Federal Home Loan Bank, Advances, Fiscal Year Maturity [Abstract]
Average interest rate of amounts due within one year	2.06%	1.25%
Average interest rate, due in one to two years	1.13%	2.06%
Average interest rate, due in two to three years	1.09%	1.13%
Average interest rate, due in three to four years	1.30%	1.09%
Average interest rate, due in four to five years	1.42%	1.30%
Average interest rate, due after five years	1.52%	1.42%

Federal_Home_Loan_Bank_Borrowi3

Federal Home Loan Bank Borrowings and Long-Term Debt Textual References (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Debt Instrument [Line Items]
Interest Expense, Trust Preferred Securities	$281,000	$296,000	$656,000
Federal Home Loan Bank Advances [Member]
Debt Instrument [Line Items]
Federal Home Loan, Bank Advances General Debt Obligations, Disclosures Maximum Borrowing Capacity as Percentage of Total Assets	35.00%
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged	263,400,000
Junior Subordinated Debt [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	15,500,000
Debt Instrument, Maturity Date	15-Dec-37
Debt Instrument, Call Date, Earliest	15-Dec-12
Debt Instrument, Description of Variable Rate Basis	three-month LIBOR
Debt Instrument, Basis Spread on Variable Rate	1.59%
Debt Instrument, Interest Rate at Period End	1.83%
Interest Expense, Trust Preferred Securities	$300,000	$300,000
Maximum | Junior Subordinated Debt [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate During Period	1.83%
Minimum | Junior Subordinated Debt [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate During Period	1.82%

Income_Tax_Components_Details

Income Tax Components (Details) (USD $)	3 Months Ended								12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Components of Income Tax Expense (Benefit), Continuing Operations [Abstract]
Current Federal tax expense									$3,573	$6,841	$4,165
Current State tax expense									956	1,259	1,103
Deferred income tax expense (benefit)									2,502	-1,454	-54
Total income tax provision	$1,668	$1,715	$1,719	$1,929	$1,584	$1,668	$1,606	$1,788	$7,031	$6,646	$5,214

Income_Tax_Reconciliation_Deta

Income Tax Reconciliation (Details) (USD $)	3 Months Ended								12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Expense (Benefit), Continuing Operations, Income Tax Reconciliation [Abstract]
Expected provision									$8,943	$8,839	$7,394
Tax-exempt interest									-2,520	-2,345	-2,213
Bank-owned life insurance									-385	-322	-323
State income taxes, net of federal income tax benefit									798	776	723
Non-deductible acquisition expenses									261	0	0
Other									-66	-302	-367
Total income tax provision	$1,668	$1,715	$1,719	$1,929	$1,584	$1,668	$1,606	$1,788	$7,031	$6,646	$5,214
Effective Federal income tax rate									35.00%	35.00%	34.00%

Deferred_Tax_Assets_and_Liabil

Deferred Tax Assets and Liabilities (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Deferred Tax Assets, Gross [Abstract]
Allowance for loan losses	$7,981	$7,753
Deferred compensation	1,022	1,076
Net operating losses	3,266	3,089
Impairment losses on securities	53	2,613
Other real estate owned	568	767
Nonaccrual interest	206	434
Other	1,072	931
Gross deferred tax assets	14,168	16,663
Deferred Tax Liabilities, Gross [Abstract]
Premises and equipment depreciation and amortization	1,992	2,012
Federal Home Loan Bank stock	132	132
Purchase accounting adjustments	684	895
Mortgage servicing rights	875	871
Prepaid expenses	213	105
Unrealized gains on investment securities	3,234	620
Deferred loan fees	249	238
Other	253	315
Gross deferred tax liabilities	7,632	5,188
Net deferred income tax asset	6,536	11,475
Valuation allowance	3,458	3,281
Net deferred tax asset	$3,078	$8,194

Income_Taxes_Textual_Reference

Income Taxes Textual References (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards	38,200,000
Unrecognized Tax Benefits	0	$0
Minimum | State and Local Jurisdiction [Member]
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards, Expiration Dates	31-Dec-18
Maximum | State and Local Jurisdiction [Member]
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards, Expiration Dates	31-Dec-35

Employee_Benefit_Plans_Textual

Employee Benefit Plans Textual References (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Employee Benefit Plans [Abstract]
Defined benefit plan, cost of providing special or contractual termination benefits recognized during period			$6,100,000
Defined contribution plan, cost recognized	676,000	647,000	667,000
Employee stock ownership plan (ESOP), compensation expense	538,000	609,000	635,000
Salary continuation plan cost recognized	294,000	350,000	359,000
Cash surrender value of life insurance, salary continuation plans	$14,300,000	$13,900,000	$13,500,000

Stock_Compensation_Plans_Detai

Stock Compensation Plans (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation, number of shares authorized	750,000
Share-based compensation, number of shares available for grant	492,878	514,191
Share-based compensation expense	$493,000	$384,000	$266,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Exercised	-15,419	-56,314	-55,986
Share-based Compensation Arrangement by Share-based Payment Award, Options, Intrinsic Value Cash Received and Tax Benefits Realized [Abstract]
Share-based compensation, options exercises in period, total intrinsic value	109,000	362,000	278,000
Share-based compensation, cash received from exercise of stock options	282,000
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized [Abstract]
Share-based compensation, nonvested stock options, compensation cost not yet recognized	0
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense	493,000	380,000	234,000
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized [Abstract]
Share-based compensation, nonvested awards, period for recognition of unrecognized compensation cost	2 years 5 months
Share-based compensation, nonvested awards other than options, compensation cost not yet recognized	740,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options Grant Date Fair Value [Abstract]
Share-based compensation, other than options, fair value of equity instruments vested in period	792,000	533,000	324,000
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense	0	4,000	32,000
Share-based compensation, description	The stock options have a maximum term of ten years, an exercise price equal to the fair market value of a share of stock on the date of grant and vest 25% per year
Share-based compensation, award vesting period	4 years
Share-based Compensation Arrangement by Share-based Payment Award, Options, Intrinsic Value Cash Received and Tax Benefits Realized [Abstract]
Share-based compensation, tax benefit from compensation expense	8,000
2008 Equity Incentive Plan [Member] | Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Nonvested at December 31, 2013	52,397
Granted	26,100
Vested	-27,491
Forfeited	-200
Nonvested at December 31, 2014	50,806
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]
Nonvested at December 31, 2013	$18.24
Granted	$24.61
Vested	$17.02
Forfeited	$19.10
Nonvested at December 31, 2014	$22.17
2008 Equity Incentive Plan [Member] | Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding at December 31, 2013	47,590
Granted	0	0	0
Exercised	-15,419
Forfeited	0
Expired	-1,310
Outstanding at December 31, 2014	30,861	47,590
Exercisable at December 31, 2014	30,861
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]
Outstanding at December 31, 2013	$15.66
Granted	$0
Exercised	$18.50
Forfeited	$0
Expired	$19.50
Outstanding at December 31, 2014	$14.08	$15.66
Exercisable at December 31, 2014	$14.08
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Share-based compensation, options outstanding weighted average remaining contractual term	3 years 1 month 6 days
Share-based compensation, options, exercisable weighted average remaining contractual term	3 years 1 month 6 days
Share-based compensation, options outstanding intrinsic value	455,000
Share-based compensation options exercisable intrinsic value	$455,000
Management [Member] | Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation, description	Each restricted stock unit entitles the recipient to receive one share of stock on the vesting date. Generally, for employee awards, the restricted stock units vest 25% per year
Share-based compensation, award vesting period	4 years
Before May 15, 2013 [Member] | Director [Member] | Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation, award vesting period	4 years
May 15, 2013 or After [Member] | Director [Member] | Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation, award vesting period	1 year

Earnings_Per_Common_Share_Deta

Earnings Per Common Share (Details) (USD $)	3 Months Ended								12 Months Ended
In Thousands, except Share data, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net income	$3,907	$4,889	$4,753	$4,973	$4,422	$4,864	$4,531	$4,790	$18,522	$18,607	$16,534
Basic earnings per common share	$0.46	$0.59	$0.56	$0.59	$0.52	$0.57	$0.54	$0.56	$2.20	$2.19	$1.95
Diluted earnings per common share	$0.46	$0.59	$0.56	$0.58	$0.52	$0.57	$0.53	$0.56	$2.19	$2.18	$1.94
Common Stock [Member]
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Weighted average shares outstanding									8,405,284	8,477,904	8,485,008
Weighted average shares outstanding, included all dilutive potential shares									8,433,296	8,525,119	8,527,544

Regulatory_Capital_Requirement2

Regulatory Capital Requirements and Restrictions on Subsidiary Cash (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
Regulatory Capital Requirements [Abstract]
Required cash reserve	$1,800,000	$1,600,000
MidWestOne Financial Group [Member]
Regulatory Capital Requirements [Abstract]
Total capital	212,559,000	200,714,000
Tier one capital	194,362,000	183,361,000
Total capital to risk weighted assets	14.73%	14.62%
Tier one risk based capital to risk weighted assets	13.47%	13.36%
Tier one leverage capital to average assets	10.85%	10.55%
Capital required for capital adequacy	115,407,000	109,812,000
Tier one risk based capital required for capital adequacy	57,703,000	54,906,000
Tier one leverage capital required for capital adequacy	71,647,000	69,491,000
Capital required for capital adequacy to risk weighted assets	8.00%	8.00%
Tier one risk based capital required for capital adequacy to Risk Weighted Assets	4.00%	4.00%
Tier one leverage capital required for capital adequacy to average assets	4.00%	4.00%
MidWestOne Bank [Member]
Regulatory Capital Requirements [Abstract]
Total capital	197,018,000	183,646,000
Tier one capital	179,098,000	166,612,000
Total capital to risk weighted assets	13.75%	13.49%
Tier one risk based capital to risk weighted assets	12.50%	12.24%
Tier one leverage capital to average assets	10.05%	9.65%
Capital required for capital adequacy	114,624,000	108,903,000
Tier one risk based capital required for capital adequacy	57,312,000	54,451,000
Tier one leverage capital required for capital adequacy	71,249,000	69,063,000
Capital required for capital adequacy to risk weighted assets	8.00%	8.00%
Tier one risk based capital required for capital adequacy to Risk Weighted Assets	4.00%	4.00%
Tier one leverage capital required for capital adequacy to average assets	4.00%	4.00%
Capital required to be well capitalized	143,280,000	136,128,000
Tier one risk based capital required to be well capitalized	85,968,000	81,677,000
Tier one leverage capital required to be well capitalized	$89,061,000	$86,329,000
Capital required to be well capitalized to risk weighted assets	10.00%	10.00%
Tier one risk based capital required to be well capitalized to risk weighted assets	6.00%	6.00%
Tier one leverage capital required to be well capitalized to average assets	5.00%	5.00%

Commitments_and_Contingencies_1

Commitments and Contingencies (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Credit Commitments [Line Items]
Loans receivable, commitment to lend	$271,041	$268,735
Commitments to sell loans held for sale	801	357
Commitments to extend credit
Credit Commitments [Line Items]
Loans receivable, commitment to lend	267,036	263,887
Standby letters of credit
Credit Commitments [Line Items]
Loans receivable, commitment to lend	$3,204	$4,491

Commitments_and_Contingencies_2

Commitments and Contingencies Building Commitments (Details) (Building Commitment [Member], USD $)	Dec. 31, 2014
In Millions, unless otherwise specified
Building Commitment [Member]
Purchase Commitment, Excluding Long-term Commitment [Line Items]
Purchase commitment, original amount committed	$29.80
Purchase commitment, remaining minimum amount committed	$15.50

Commitments_and_Contingencies_3

Commitments and Contingencies Textual References (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Concentration Risk [Line Items]
Concentration risk, additional characteristic	Iowa
Standby letters of credit
Concentration Risk [Line Items]
Loss contingency accrual	0.2	$0.20
State and political subdivisions
Concentration Risk [Line Items]
Concentration risk, credit risk, financial instrument maximum exposure	5
Geographic Concentration Risk [Member] | State and political subdivisions
Concentration Risk [Line Items]
Concentration risk, credit risk, financial instrument maximum exposure	135.3
Accounts Receivable [Member] | Agricultural Related Loan Financing Receivable [Member]
Concentration Risk [Line Items]
Concentration risk, percentage	17.00%
Accounts Receivable [Member] | Commercial Real Estate Portfolio Segment [Member]
Concentration Risk [Line Items]
Concentration risk, percentage	62.00%

Related_Party_Transactions_Det

Related Party Transactions (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Loans and Leases Receivable, Related Parties [Roll Forward]
Balance, beginning	$22,392	$21,935
Net decrease due to change in related parties	-10,275	-150
Advances	2,420	2,310
Collections	-2,882	-1,703
Balance, ending	$11,655	$22,392

Related_Party_Transactions_Tex

Related Party Transactions Textual References (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Related Party Transaction [Line Items]
Related party deposit liabilities	$6,500,000	$7,300,000
Description of related party transaction	The Company has from time to time engaged Neumann Monson, P.C. (“Neumann Monson”), an architectural services firm headquartered in Iowa City for which Kevin Monson, Chairman of the Company, is President, Managing Partner and majority owner, to perform architectural and design services with respect to the Company's offices.
Amount of related party transaction	$315,000	$2,289,000

Fair_Value_Financial_Assets_an

Fair Value Financial Assets and Liabilities Measured on a Recurring Basis (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
		count
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment in Collateralized Debt Obligations, Number of Securities		5
Investment securities gains	$1,227	$65	$805
Available for sale	474,942	498,561
Mortgage servicing rights	2,308	2,298
Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale	3,032	3,057
Mortgage servicing rights	0
Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale	471,910	494,187
Mortgage servicing rights	0
Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale		1,317
Mortgage servicing rights	2,308
Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale	474,942	498,561
Mortgage servicing rights	2,308	2,298
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale	3,032	3,057
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale	471,910	494,187
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale		1,317
Mortgage servicing rights	2,308	2,298
U.S. Government agencies and corporations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale	49,375	44,939
U.S. Government agencies and corporations | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale	49,375	44,939
U.S. Government agencies and corporations | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale	49,375	44,939
State and political subdivisions
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale	195,199	210,796
State and political subdivisions | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale	195,199	210,796
State and political subdivisions | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale	195,199	210,796
Mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale	32,463	39,285
Mortgage-backed securities | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale	32,463	39,285
Mortgage-backed securities | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale	32,463	39,285
Collateralized mortgage obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale	146,132	169,223
Collateralized mortgage obligations | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale	146,132	169,223
Collateralized mortgage obligations | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale	146,132	169,223
Corporate debt securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale	48,741	29,944
Corporate debt securities | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale	48,741	29,944
Corporate debt securities | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale	48,741	29,944
Collateralized debt obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities gains	800
Available for sale		1,317
Collateralized debt obligations | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale		1,317
Collateralized debt obligations | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale		1,317
Total debt securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale	471,910	495,504
Total debt securities | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale	471,910	495,504
Total debt securities | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale	471,910	494,187
Total debt securities | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale		1,317
Equity securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale	3,032	3,057
Equity securities | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale	3,032	3,057
Equity securities | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale	$3,032	$3,057

Fair_Value_Assets_Measured_on_

Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation by Asset Class (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Mortgage servicing rights
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance	$2,298	$1,484
Total gains (losses):
Included in earnings	-243	293
Purchases, issuances, sales, and settlements:
Issuances	253	521
Ending Balance	2,308	2,298
Collateralized debt obligations
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance	1,317	755
Total gains (losses):
Included in earnings	782	-18
Included in other comprehensive income	794	822
Purchases, issuances, sales, and settlements:
Sales	2,893
Settlements		-242
Ending Balance	$0	$1,317

Fair_Value_Assets_Measure_on_R

Fair Value, Assets Measure on Recurring Basis, Unobservable Inputs,Gain (Loss) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Mortgage servicing rights
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair value, assets measured on recurring basis, gain (loss) included in earnings	$10	$814
Collateralized debt obligations
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair value, assets measured on recurring basis, gain (loss) included in earnings		-18
Change in unrealized losses for the period included in comprehensive net income	$794	$822

Fair_Value_Assets_and_Liabilit

Fair Value Assets and Liabilities Measured on a Nonrecurring Basis (Details) (Fair Value, Measurements, Nonrecurring [Member], USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Collateral dependent impaired loans:
Commercial and industrial	$793	$1,043
Construction and development	49	136
Farmland Loans-Collateral Dependent	52	65
Commercial real estate-other	1,012	1,786
Total commercial real estate	1,113	1,987
One- to four- family first liens	1,427	186
One- to four- family junior liens	47	30
Total residential real estate	1,474	216
Consumer	32	44
Collateral dependent impaired loans	3,412	3,290
Other real estate owned	1,916	1,770
Fair Value, Inputs, Level 3 [Member]
Collateral dependent impaired loans:
Commercial and industrial	793	1,043
Construction and development	49	136
Farmland Loans-Collateral Dependent	52	65
Commercial real estate-other	1,012	1,786
Total commercial real estate	1,113	1,987
One- to four- family first liens	1,427	186
One- to four- family junior liens	47	30
Total residential real estate	1,474	216
Consumer	32	44
Collateral dependent impaired loans	3,412	3,290
Other real estate owned	$1,916	$1,770

Fair_Value_of_Financial_Instru

Fair Value of Financial Instruments (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Investment securities:
Available for sale	$474,942	$498,561
Held to maturity	51,524	32,625
Loans held for sale	801	357
Residential real estate:
Loan pool participations, net	19,332	25,533
Accrued interest receivable	10,898	10,409
Federal Home Loan Bank Stock	8,582	9,226
Mortgage servicing rights	2,308	2,298
Deposits:
Non-interest-bearing demand	214,461	222,359
Interest-bearing checking	618,540	592,673
Savings	102,527	94,559
Certificates of deposit under $100,000	235,395	256,283
Certificates of deposit $100,000 and over	237,619	209,068
Total deposits	1,408,542	1,374,942
Federal Home Loan Bank borrowings	93,000	106,900
Long-term debt	15,464	15,464
Accrued interest payable	863	765
Carrying Amount
Financial assets:
Cash and cash equivalents	23,409	24,890
Investment securities:
Available for sale	474,942	498,561
Held to maturity	51,524	32,625
Total investment securities	526,466	531,186
Loans held for sale	801	357
Loans, net:
Agricultural	103,193	95,712
Commercial and industrial	297,048	257,153
Credit cards	1,206	998
Overdrafts	610	415
Commercial real estate:
Construction and development	58,665	71,433
Farmland	82,888	84,387
Multifamily	54,516	54,883
Commercial real estate-other	225,605	217,993
Total commercial real estate	421,674	428,696
Residential real estate:
One- to four- family first liens	216,338	217,765
One- to four- family junior liens	52,821	52,903
Total residential real estate	269,159	270,668
Consumer	23,266	18,591
Total loans, net	1,116,156	1,072,233
Loan pool participations, net	19,332	25,533
Accrued interest receivable	10,898	10,409
Federal Home Loan Bank Stock	8,582	9,226
Mortgage servicing rights	2,308
Deposits:
Non-interest-bearing demand	214,461	222,359
Interest-bearing checking	618,540	592,673
Savings	102,527	94,559
Certificates of deposit under $100,000	235,395	256,283
Certificates of deposit $100,000 and over	237,619	209,068
Total deposits	1,408,542	1,374,942
Federal funds purchased and securities sold under agreements to repurchase	78,229	66,665
Federal Home Loan Bank borrowings	93,000	106,900
Long-term debt	15,464	15,464
Accrued interest payable	863	765
Estimated Fair Value
Financial assets:
Cash and cash equivalents	23,409	24,890
Investment securities:
Available for sale	474,942	498,561
Held to maturity	51,253	30,191
Total investment securities	526,195	528,752
Loans held for sale	812	367
Loans, net:
Agricultural	102,927	95,609
Commercial and industrial	295,886	256,257
Credit cards	1,206	998
Overdrafts	610	415
Commercial real estate:
Construction and development	58,764	71,569
Farmland	83,285	85,058
Multifamily	54,356	54,953
Commercial real estate-other	225,899	219,213
Total commercial real estate	422,304	430,793
Residential real estate:
One- to four- family first liens	216,326	218,257
One- to four- family junior liens	53,664	53,798
Total residential real estate	269,990	272,055
Consumer	23,362	18,638
Total loans, net	1,116,285	1,074,765
Loan pool participations, net	19,332	25,533
Accrued interest receivable	10,898	10,409
Federal Home Loan Bank Stock	8,582	9,226
Mortgage servicing rights	2,308
Deposits:
Non-interest-bearing demand	214,461	222,359
Interest-bearing checking	618,540	592,673
Savings	102,527	94,559
Certificates of deposit under $100,000	235,401	256,549
Certificates of deposit $100,000 and over	238,480	209,543
Total deposits	1,409,409	1,375,683
Federal funds purchased and securities sold under agreements to repurchase	78,229	66,665
Federal Home Loan Bank borrowings	93,051	107,356
Long-term debt	10,021	9,872
Accrued interest payable	863	765
Fair Value, Inputs, Level 1 [Member]
Financial assets:
Cash and cash equivalents	23,409	24,890
Investment securities:
Available for sale	3,032	3,057
Total investment securities	3,032	3,057
Residential real estate:
Accrued interest receivable	10,898	10,409
Mortgage servicing rights	0
Deposits:
Non-interest-bearing demand	214,461	222,359
Interest-bearing checking	618,540	592,673
Savings	102,527	94,559
Total deposits	935,528	909,591
Federal funds purchased and securities sold under agreements to repurchase	78,229	66,665
Accrued interest payable	863	765
Fair Value, Inputs, Level 2 [Member]
Investment securities:
Available for sale	471,910	494,187
Held to maturity	51,253	30,191
Total investment securities	523,163	524,378
Residential real estate:
Federal Home Loan Bank Stock	8,582	9,226
Mortgage servicing rights	0
Deposits:
Certificates of deposit under $100,000	235,401	256,549
Certificates of deposit $100,000 and over	238,480	209,543
Total deposits	473,881	466,092
Fair Value, Inputs, Level 3 [Member]
Investment securities:
Available for sale		1,317
Total investment securities		1,317
Loans held for sale	812	367
Loans, net:
Agricultural	102,927	95,609
Commercial and industrial	295,886	256,257
Credit cards	1,206	998
Overdrafts	610	415
Commercial real estate:
Construction and development	58,764	71,569
Farmland	83,285	85,058
Multifamily	54,356	54,953
Commercial real estate-other	225,899	219,213
Total commercial real estate	422,304	430,793
Residential real estate:
One- to four- family first liens	216,326	218,257
One- to four- family junior liens	53,664	53,798
Total residential real estate	269,990	272,055
Consumer	23,362	18,638
Total loans, net	1,116,285	1,074,765
Loan pool participations, net	19,332	25,533
Mortgage servicing rights	2,308
Deposits:
Federal Home Loan Bank borrowings	93,051	107,356
Long-term debt	$10,021	$9,872

Fair_Value_Unobservable_Inputs

Fair Value, Unobservable Inputs Valuation Techniques (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Collateral dependent impaired loans:
Mortgage servicing rights	2,308	$2,298
Fair Value, Measurements, Recurring [Member]
Collateral dependent impaired loans:
Mortgage servicing rights	2,308	2,298
Fair Value, Measurements, Nonrecurring [Member]
Collateral dependent impaired loans:
Commercial and industrial	793	1,043
Construction and development	49	136
Commercial real estate-other	1,012	1,786
One- to four- family first liens	1,427	186
One- to four- family junior liens	47	30
Consumer	32	44
Other real estate owned	1,916	1,770
Fair Value, Inputs, Level 3 [Member]
Collateral dependent impaired loans:
Mortgage servicing rights	2,308
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member]
Collateral dependent impaired loans:
Mortgage servicing rights	2,308	2,298
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Mortgage servicing rights
Collateral dependent impaired loans:
Mortgage servicing rights	2,308
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Mortgage servicing rights | Discounted Cash Flow [Member] | Minimum
Fair value inputs:
Pretax discount rate	10.00%
Constant prepayment rate	7.49%
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Mortgage servicing rights | Discounted Cash Flow [Member] | Maximum
Fair value inputs:
Pretax discount rate	13.00%
Constant prepayment rate	15.24%
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Mortgage servicing rights | Discounted Cash Flow [Member] | Weighted Average [Member]
Fair value inputs:
Pretax discount rate	10.16%
Constant prepayment rate	8.64%
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member]
Collateral dependent impaired loans:
Commercial and industrial	793	1,043
Construction and development	49	136
Commercial real estate-other	1,012	1,786
One- to four- family first liens	1,427	186
One- to four- family junior liens	47	30
Consumer	32	44
Other real estate owned	1,916	$1,770
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Commercial and Industrial Loan Financing Receivable [Member] | Modified Appraised Value [Member] | Minimum
Fair value inputs:
Third party appraisal	NM *
Appraisal discount	NM *
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Commercial and Industrial Loan Financing Receivable [Member] | Modified Appraised Value [Member] | Maximum
Fair value inputs:
Third party appraisal	NM *
Appraisal discount	NM *
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Commercial and Industrial Loan Financing Receivable [Member] | Modified Appraised Value [Member] | Weighted Average [Member]
Fair value inputs:
Third party appraisal	NM *
Appraisal discount	NM *
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Commercial Real Estate Construction and Development Loan Financing Receivable [Member] | Modified Appraised Value [Member] | Minimum
Fair value inputs:
Third party appraisal	NM *
Appraisal discount	NM *
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Commercial Real Estate Construction and Development Loan Financing Receivable [Member] | Modified Appraised Value [Member] | Maximum
Fair value inputs:
Third party appraisal	NM *
Appraisal discount	NM *
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Commercial Real Estate Construction and Development Loan Financing Receivable [Member] | Modified Appraised Value [Member] | Weighted Average [Member]
Fair value inputs:
Third party appraisal	NM *
Appraisal discount	NM *
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Farmland Loan Financing Receivable [Member] | Modified Appraised Value [Member] | Minimum
Fair value inputs:
Third party appraisal	NM *
Appraisal discount	NM *
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Farmland Loan Financing Receivable [Member] | Modified Appraised Value [Member] | Maximum
Fair value inputs:
Third party appraisal	NM *
Appraisal discount	NM *
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Farmland Loan Financing Receivable [Member] | Modified Appraised Value [Member] | Weighted Average [Member]
Fair value inputs:
Third party appraisal	NM *
Appraisal discount	NM *
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Commercial Real Estate Loan Other Financing Receivable [Member] | Modified Appraised Value [Member] | Minimum
Fair value inputs:
Third party appraisal	NM *
Appraisal discount	NM *
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Commercial Real Estate Loan Other Financing Receivable [Member] | Modified Appraised Value [Member] | Maximum
Fair value inputs:
Third party appraisal	NM *
Appraisal discount	NM *
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Commercial Real Estate Loan Other Financing Receivable [Member] | Modified Appraised Value [Member] | Weighted Average [Member]
Fair value inputs:
Third party appraisal	NM *
Appraisal discount	NM *
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Residential Real Estate First Lien Loan Financing Receivable [Member] | Modified Appraised Value [Member] | Minimum
Fair value inputs:
Third party appraisal	NM *
Appraisal discount	NM *
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Residential Real Estate First Lien Loan Financing Receivable [Member] | Modified Appraised Value [Member] | Maximum
Fair value inputs:
Third party appraisal	NM *
Appraisal discount	NM *
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Residential Real Estate First Lien Loan Financing Receivable [Member] | Modified Appraised Value [Member] | Weighted Average [Member]
Fair value inputs:
Third party appraisal	NM *
Appraisal discount	NM *
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Residential Real Estate Junior Lien Loan Financing Receivable [Member] | Modified Appraised Value [Member] | Minimum
Fair value inputs:
Third party appraisal	NM *
Appraisal discount	NM *
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Residential Real Estate Junior Lien Loan Financing Receivable [Member] | Modified Appraised Value [Member] | Maximum
Fair value inputs:
Third party appraisal	NM *
Appraisal discount	NM *
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Residential Real Estate Junior Lien Loan Financing Receivable [Member] | Modified Appraised Value [Member] | Weighted Average [Member]
Fair value inputs:
Third party appraisal	NM *
Appraisal discount	NM *
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Consumer Other Financing Receivable [Member] | Modified Appraised Value [Member] | Minimum
Fair value inputs:
Third party appraisal	NM *
Appraisal discount	NM *
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Consumer Other Financing Receivable [Member] | Modified Appraised Value [Member] | Maximum
Fair value inputs:
Third party appraisal	NM *
Appraisal discount	NM *
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Consumer Other Financing Receivable [Member] | Modified Appraised Value [Member] | Weighted Average [Member]
Fair value inputs:
Third party appraisal	NM *
Appraisal discount	NM *
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Other real estate owned | Modified Appraised Value [Member] | Minimum
Fair value inputs:
Third party appraisal	NM *
Appraisal discount	NM *
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Other real estate owned | Modified Appraised Value [Member] | Maximum
Fair value inputs:
Third party appraisal	NM *
Appraisal discount	NM *
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Other real estate owned | Modified Appraised Value [Member] | Weighted Average [Member]
Fair value inputs:
Third party appraisal	NM *
Appraisal discount	NM *

Proposed_Merger_Proposed_Merge

Proposed Merger Proposed Merger (Details) (USD $)	3 Months Ended
In Millions, except Share data, unless otherwise specified	Dec. 31, 2014
Business Acquisition [Line Items]
Business Acquisition, Name of Acquired Entity	Central Bancshares, Inc.
Central Bancshares, Inc. [Member]
Business Acquisition [Line Items]
Payments to Acquire Businesses, Gross	64
Central Bancshares, Inc. [Member] | Common Stock [Member]
Business Acquisition [Line Items]
Shares to be issued in proposed business combination	2,723,083

Parent_Company_Only_Balance_Sh

Parent Company Only Balance Sheets (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
In Thousands, unless otherwise specified
Assets:
Loan pool participations, net	$19,332	$25,533
Deferred income taxes	3,078	8,194
Other assets	14,075	14,560
Total assets	1,800,302	1,755,218
Liabilities:
Long-term debt	15,464	15,464
Other liabilities	8,080	8,997
Total liabilities	1,607,571	1,577,202
Shareholders’ equity:
Capital stock, preferred	0	0
Capital stock, common	8,690	8,690
Additional paid-in capital	80,537	80,506
Treasury stock	-6,945	-3,702
Retained earnings	105,127	91,473
Accumulated other comprehensive income	5,322	1,049
Total shareholders’ equity	192,731	178,016	173,932	156,494
Total liabilities and shareholders’ equity	1,800,302	1,755,218
Parent Company [Member]
Assets:
Cash	5,942	5,781
Investment in subsidiaries	193,600	177,190
Marketable equity securities, available for sale	2,066	2,111
Loan pool participations, net	1,964	3,409
Income tax receivable	0	75
Deferred income taxes	425	729
Other assets	5,010	4,447
Total assets	209,007	193,742
Liabilities:
Long-term debt	15,464	15,464
Other liabilities	812	262
Total liabilities	16,276	15,726
Shareholders’ equity:
Capital stock, preferred	0	0
Capital stock, common	8,690	8,690
Additional paid-in capital	80,537	80,506
Treasury stock	-6,945	-3,702
Retained earnings	105,127	91,473
Accumulated other comprehensive income	5,322	1,049
Total shareholders’ equity	192,731	178,016
Total liabilities and shareholders’ equity	$209,007	$193,742

Parent_Company_Only_Statements

Parent Company Only Statements of Operations (Details) (USD $)	3 Months Ended								12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Condensed Financial Statements, Captions [Line Items]
Interest and discount on loan pool participations									$1,516	$2,046	$1,978
Investment securities gains									1,227	65	805
Interest on long-term debt									-281	-296	-656
Operating expenses	11,563	10,819	10,639	10,392	10,225	10,283	10,585	10,994	43,413	42,087	48,960
Income before income tax expense	5,575	6,604	6,472	6,902	6,006	6,532	6,137	6,578	25,553	25,253	21,748
Income tax benefit	1,668	1,715	1,719	1,929	1,584	1,668	1,606	1,788	7,031	6,646	5,214
Net income	3,907	4,889	4,753	4,973	4,422	4,864	4,531	4,790	18,522	18,607	16,534
Parent Company [Member]
Condensed Financial Statements, Captions [Line Items]
Dividends from subsidiaries									8,500	4,006	5,520
Interest income and dividends on marketable equity securities									49	33	168
Interest and discount on loan pool participations									-293	-940	-2,149
Investment securities gains									0	0	381
Interest on long-term debt									-281	-296	-656
Operating expenses									2,351	1,034	1,064
Income before income tax expense									5,624	1,769	2,200
Income tax benefit									-807	-890	-1,355
Income before equity in subsidiaries’ undistributed income									6,431	2,659	3,555
Equity in subsidiaries’ undistributed income									12,091	15,948	12,979
Net income									$18,522	$18,607	$16,534

Parent_Company_Only_Statements1

Parent Company Only Statements of Cash Flows (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Cash flows from operating activities:
Net income	$18,522	$18,607	$16,534
Adjustments to reconcile net income to net cash provided by operating activities:
Deferred income taxes	2,502	-1,454	-54
Investment securities gain	-1,227	-65	-805
Stock based compensation	493	384	266
Other-than-temporary impairment of investment securities	0	0	345
Increase in other assets	485	5,822	1,280
Increase (decrease) in other liabilities	-819	-1,410	1,409
Net cash provided by operating activities	23,264	28,260	22,538
Cash flows from investing activities
Proceeds from sales of investment securities	33,457	12,447	18,307
Purchase of investment securities	-67,892	-74,582	-172,060
Loan participation pools, net	6,201	10,117	14,402
Net cash provided by investing activities	-47,436	-5,406	-88,403
Cash flows from financing activities:
Stock options exercised	282	320	590
Repurchase of common stock	-3,987	-967	-1,810
Dividends paid	-4,868	-4,259	-3,054
Net cash used in financing activities	22,691	-45,155	80,433
Increase in cash	-1,481	-22,301	14,568
Parent Company [Member]
Cash flows from operating activities:
Net income	18,522	18,607	16,534
Adjustments to reconcile net income to net cash provided by operating activities:
Undistributed (earnings) loss of subsidiaries, net of dividends and distributions	-12,091	-15,948	-12,979
Deferred income taxes	330	-583	-106
Investment securities gain	0	0	-381
Stock based compensation	493	384	266
Increase in other assets	-488	-232	-158
Increase (decrease) in other liabilities	550	-15	4
Net cash provided by operating activities	7,316	2,213	3,180
Cash flows from investing activities
Proceeds from sales of investment securities	2	2	1,131
Purchase of investment securities	-29	-24	-1,192
Loan participation pools, net	1,445	2,719	5,834
Net cash provided by investing activities	1,418	2,697	5,773
Cash flows from financing activities:
Stock options exercised	282	320	590
Repurchase of common stock	-3,987	-967	-1,810
Dividends paid	-4,868	-4,259	-3,054
Net cash used in financing activities	-8,573	-4,906	-4,274
Increase in cash	161	4	4,679
Cash Balance:
Beginning	5,781	5,777	1,098
Ending	$5,942	$5,781	$5,777

Subsequent_Events_Subsequent_E

Subsequent Events Subsequent Events Textual References (Details) (Subsequent Event [Member], Common Stock [Member], USD $)	0 Months Ended
	Jan. 21, 2015	Jan. 21, 2015
Subsequent Event [Member] | Common Stock [Member]
Subsequent Event [Line Items]
Dividends Payable, Amount Per Share	$0.15	$0.15
Dividends Payable, Date to be Paid	16-Mar-15
Dividends Payable, Date of Record	27-Feb-15

Quarterly_Results_of_Operation2

Quarterly Results of Operations (unaudited) (Details) (USD $)	3 Months Ended								12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Interest income	$16,311	$15,996	$16,176	$15,921	$16,020	$16,116	$16,768	$17,190	$64,404	$66,094	$69,302
Interest expense	2,407	2,429	2,321	2,394	2,723	2,851	3,159	3,399	9,551	12,132	15,952
Net interest income	13,904	13,567	13,855	13,527	13,297	13,265	13,609	13,791	54,853	53,962	53,350
Provision for loan losses	300	150	300	450	300	250	600	200	1,200	1,350	2,379
Noninterest income	3,534	4,006	3,556	4,217	3,234	3,800	3,713	3,981	15,313	14,728	19,737
Noninterest expense	11,563	10,819	10,639	10,392	10,225	10,283	10,585	10,994	43,413	42,087	48,960
Income before income tax expense	5,575	6,604	6,472	6,902	6,006	6,532	6,137	6,578	25,553	25,253	21,748
Income tax expense (Includes $478 and $25 income tax expense reclassified from accumulated other comprehensive income for the year ended December 31, 2014 and 2013, respectively)	1,668	1,715	1,719	1,929	1,584	1,668	1,606	1,788	7,031	6,646	5,214
Net income	$3,907	$4,889	$4,753	$4,973	$4,422	$4,864	$4,531	$4,790	$18,522	$18,607	$16,534
Basic earnings per common share	$0.46	$0.59	$0.56	$0.59	$0.52	$0.57	$0.54	$0.56	$2.20	$2.19	$1.95
Diluted earnings per common share	$0.46	$0.59	$0.56	$0.58	$0.52	$0.57	$0.53	$0.56	$2.19	$2.18	$1.94