Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Cash Flows from Operating Activities
Net income	$ 16,914us-gaap_NetIncomeLoss	$ 17,790us-gaap_NetIncomeLoss	$ 17,747us-gaap_NetIncomeLoss
Adjustment to reconcile net income to net cash provided by operating activities:
Provision for loan losses	1,641us-gaap_ProvisionForLoanAndLeaseLosses	1,531us-gaap_ProvisionForLoanAndLeaseLosses	3,134us-gaap_ProvisionForLoanAndLeaseLosses
Deferred income tax expense	73us-gaap_DeferredIncomeTaxExpenseBenefit	64us-gaap_DeferredIncomeTaxExpenseBenefit	204us-gaap_DeferredIncomeTaxExpenseBenefit
Depreciation of premises and equipment	732us-gaap_Depreciation	726us-gaap_Depreciation	764us-gaap_Depreciation
Amortization of intangibles	1,075us-gaap_AmortizationOfIntangibleAssets	1,078us-gaap_AmortizationOfIntangibleAssets	1,083us-gaap_AmortizationOfIntangibleAssets
Amortization of premiums and accretion of discounts, net	138	171	224
(Gains) losses on disposal of fixed assets	94us-gaap_GainLossOnDispositionOfAssets1	(11)us-gaap_GainLossOnDispositionOfAssets1	(3)us-gaap_GainLossOnDispositionOfAssets1
Gains on calls of securities available for sale, net	(2)	52	(46)
Gains on calls of securities held to maturity, net		(6)	(15)
(Gains) losses and writedowns on other real estate owned	129	99	(14)
Income on investment in BOLI	(616)	(658)
Originations of mortgage loans held for sale	(9,104)	(16,737)	(22,747)
Sales of mortgage loans held for sale	10,089	18,257	22,574
Net change in:
Accrued interest receivable	201	298	57
Other assets	(574)	1,760	(8)
Accrued interest payable	(24)	(47)	(67)
Other liabilities	(428)	83	(175)
Net cash provided by operating activities	20,338	24,450	22,712
Cash Flows from Investing Activities
Net change in interest-bearing deposits	(4,482)	(781)	1,634
Proceeds from repayments of mortgage-backed securities	902	1,745	3,160
Proceeds from calls and maturities of securities available for sale	11,088	63,886	151,175
Proceeds from calls and maturities of securities held to maturity	8,677	9,738	30,942
Purchases of securities available for sale	(33,905)	(83,996)	(171,577)
Purchases of securities held to maturity	(6,381)	(13,484)	(47,803)
Net change in restricted stock	325	275	(24)
Purchases of loan participations	(200)	(900)	(2,082)
Collections of loan participations	1,539	152	1,988
Loan originations and principal collections, net	(13,880)	(8,830)	(8,182)
Proceeds from disposal of other real estate owned	744	854	1,699
Recoveries on loans charged off	255	167	100
Additions to premises and equipment	(459)	(276)	(769)
Proceeds from sale of premises and equipment	453	11
Net cash used in investing activities	(35,324)	(31,439)	(39,739)
Cash Flows from Financing Activities
Net change in time deposits	(24,963)us-gaap_IncreaseDecreaseInTimeDeposits	(36,029)us-gaap_IncreaseDecreaseInTimeDeposits	(33,333)us-gaap_IncreaseDecreaseInTimeDeposits
Net change in other deposits	47,355us-gaap_IncreaseDecreaseInOtherDeposits	49,299us-gaap_IncreaseDecreaseInOtherDeposits	60,766us-gaap_IncreaseDecreaseInOtherDeposits
Cash dividends paid	(7,853)us-gaap_PaymentsOfDividends	(7,781)us-gaap_PaymentsOfDividends	(7,639)us-gaap_PaymentsOfDividends
Stock options exercised	58		119
Net cash provided by financing activities	14,597	5,489	19,913
Net change in cash and due from banks	(389)	(1,500)	2,886
Cash and due from banks at beginning of year	13,283us-gaap_CashAndDueFromBanks	14,783us-gaap_CashAndDueFromBanks	11,897us-gaap_CashAndDueFromBanks
Cash and due from banks at end of year	12,894us-gaap_CashAndDueFromBanks	13,283us-gaap_CashAndDueFromBanks	14,783us-gaap_CashAndDueFromBanks
Supplemental Disclosures of Cash Flow Information
Interest paid on deposits and borrowed funds	4,923us-gaap_InterestPaid	6,002us-gaap_InterestPaid	7,954us-gaap_InterestPaid
Income taxes paid	5,282us-gaap_IncomeTaxesPaidNet	5,145us-gaap_IncomeTaxesPaidNet	4,930us-gaap_IncomeTaxesPaidNet
Supplemental Disclosures of Noncash Activities
Loans charged against the allowance for loan losses	1,860	1,820	2,953
Loans transferred to other real estate owned	905us-gaap_TransferToOtherRealEstate	4,230us-gaap_TransferToOtherRealEstate	1,631us-gaap_TransferToOtherRealEstate
Unrealized gains (losses) on securities available for sale	19,121	(24,704)	(922)
Minimum pension liability adjustment	$ 1,750	$ 2,819	$ (1,258)

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Amount of loans and leases that have been written off from both loan receivables and allowance reserve for credit loss.

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For banks and other depository institutions: Includes cash on hand (currency and coin), cash items in process of collection, noninterest bearing deposits due from other financial institutions (including corporate credit unions), and noninterest bearing balances with the Federal Reserve Banks, Federal Home Loan Banks and central banks.

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Value transferred from mortgage loans to real estate owned (REO) in noncash transactions.

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