Shareholders' Equity, Other Comprehensive Income and Earnings Per Common Share (Details) (USD $)	0 Months Ended	3 Months Ended								12 Months Ended			0 Months Ended		1 Months Ended		0 Months Ended
	Jan. 09, 2009	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Apr. 11, 2012 Series A Preferred Stock [Member]	Jul. 27, 2011 Series A Preferred Stock [Member]	Jul. 27, 2011 Series A Preferred Stock [Member]	Jan. 09, 2009 Series A Preferred Stock [Member]	Jan. 09, 2009 Warrant [Member]
Class of Stock [Line Items]
Value of equity issued	$ 20,000,000																$ 792,000
Preferred stock, shares issued (in shares)		0				10,000				0	10,000		10,000			20,000
Preferred stock, par value (in dollars per share)		$ 1.00				$ 1.00				$ 1.00	$ 1.00					$ 1.00
Preferred stock, liquidation preference per share (in dollars per share)																$ 1,000
Term of warrant																	10 years
Common stock shares purchasable upon exercise of warrant (in shares)																	167,504
Common stock, par value (in dollars per share)		$ 1.00				$ 1.00				$ 1.00	$ 1.00						$ 1.00
Exercise price of warrants (in dollars per share)																	$ 17.91
Value of stock redeemed										10,000,000	10,000,000		10,000,000	10,000,000	10,000,000
Amount paid to redeem preferred stock													10,080,000	10,100,000	10,100,000
Liquidation preference													10,000,000	10,000,000	10,000,000	20,000,000
Accrued and unpaid dividends													78,000	100,000	100,000
Accumulated other comprehensive income, tax		2,510,000				1,790,000				2,510,000	1,790,000	30,000
Components of other comprehensive income, net of deferred tax assets [Abstract]
Net unrealized gains on securities		5,951,000				4,596,000				5,951,000	4,596,000	501,000
Net unrecognized loss on cash flow hedges		(313,000)				(314,000)				(313,000)	(314,000)	(91,000)
Net unrecognized losses on defined benefit pension plan		(922,000)				(898,000)				(922,000)	(898,000)	(339,000)
Total cumulative other comprehensive income		4,716,000				3,384,000				4,716,000	3,384,000	71,000
Changes in accumulated other comprehensive income, by category, net of tax [Abstract]
Unrealized Loss on Cash Flow Hedging Instruments, Beginning balance					(314,000)				(91,000)	(314,000)	(91,000)	0
Unrealized Loss on Cash Flow Hedging Instruments, Net change										1,000	(223,000)	(91,000)
Unrealized Loss on Cash Flow Hedging Instruments, Ending balance		(313,000)				(314,000)				(313,000)	(314,000)	(91,000)
Unrealized Holding Gains on Securities, Beginning balance					4,596,000				501,000	4,596,000	501,000	1,168,000
Unrealized Holding Gains on Securities, Net change										1,355,000	4,095,000	(667,000)
Unrealized Holding Gains on Securities, Ending balance		5,951,000				4,596,000				5,951,000	4,596,000	501,000
Defined Benefit Pension Plan Assets and Benefit Obligations, Beginning balance					(898,000)				(339,000)	(898,000)	(339,000)	(200,000)
Changes in defined benefit plan assets and benefit obligations, net										(24,000)	(559,000)	(139,000)
Defined Benefit Pension Plan Assets and Benefit Obligations, Ending balance		(922,000)				(898,000)				(922,000)	(898,000)	(339,000)
Beginning balance, Total					3,384,000				71,000	3,384,000	71,000	968,000
Net change, Total										1,332,000	3,313,000	(897,000)
Ending balance, Total		4,716,000				3,384,000				4,716,000	3,384,000	71,000
Defined benefit pension plan: [Abstract]
Net loss, Pre-Tax										31,000	(788,000)	(142,000)
Net loss, Tax Expense (Benefit)										11,000	(276,000)	(50,000)
Net loss, Net-of-Tax										20,000	(512,000)	(92,000)
Amortization of prior service costs, Pre-Tax										(68,000)	(68,000)	(68,000)
Amortization of prior service costs, Tax Expense (Benefit)										(24,000)	(24,000)	(24,000)
Amortization of prior service costs, Net-of-Tax										(44,000)	(44,000)	(44,000)
Amortization of net obligation at transition, Pre-Tax											(4,000)	(5,000)
Amortization of net obligation at transition, Tax-expense											(1,000)	(2,000)
Amortization of net obligation at transition, Net-of-Tax											(3,000)	(3,000)
Defined benefit pension plan assets and benefit obligations, net, Pre-Tax										(37,000)	(860,000)	(215,000)
Defined benefit pension plan assets and benefit obligations, net, Tax Expense (Benefit)										(13,000)	(301,000)	(76,000)
Defined benefit pension plan assets and benefit obligations, net, Net-of-Tax										(24,000)	(559,000)	(139,000)
Unrealized loss on cash flow hedging instruments, Pre-Tax										1,000	(368,000)	(148,000)
Unrealized loss on cash flow hedging instruments, Tax Expense (Benefit)										0	(145,000)	(57,000)
Unrealized loss on cash flow hedging instruments, Net-of-Tax										1,000	(223,000)	(91,000)
Unrealized holding gains (losses) on securities, Pre-Tax										2,085,000	6,300,000	(1,026,000)
Unrealized holding gains (losses) on securities, Tax Expense (Benefit)										730,000	2,205,000	(359,000)
Unrealized holding gains (losses) on securities, Net-of-Tax										1,355,000	4,095,000	(667,000)
Total increase in other comprehensive income, Pre-Tax										2,049,000	5,072,000	(1,389,000)
Total increase in other comprehensive income, Tax Expense (Benefit)										717,000	1,759,000	(492,000)
Total increase in other comprehensive income, Net-of-Tax										1,332,000	3,313,000	(897,000)
Net gains from securities reclassified from other comprehensive income to earnings										7,000	8,000	46,000
Earnings Per Common Share [Abstract]
Net income		3,888,000	4,533,000	4,181,000	3,780,000	3,411,000	3,513,000	3,083,000	2,969,000	16,382,000	12,976,000	8,110,000
Accumulated dividends on Series A Preferred Stock										(139,000)	(850,000)	(1,000,000)
Accretion of Series A Preferred Stock discount										(172,000)	(333,000)	(149,000)
Net income available to common shareholders		$ 3,888,000	$ 4,533,000	$ 4,016,000	$ 3,634,000	$ 3,265,000	$ 3,055,000	$ 2,793,000	$ 2,680,000	$ 16,071,000	$ 11,793,000	$ 6,961,000
Weighted average number of shares used in earnings per common share - basic (in shares)										3,215,049	3,135,645	3,085,025
Effect of dilutive securities:
Stock option awards and Warrant (in shares)										90,853	36,632	18,444
Weighted average number of common shares used in earnings per common share - assuming dilution (in shares)										3,305,902	3,172,277	3,103,469
Antidilutive securities excluded from computation of diluted earnings per common share (in shares)										215,000	316,000	361,000