Parent Company Financial Statements (Statements of Cash Flows) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Operating Activities
Net Income	$ 22,783	$ 23,428	$ 26,177
Depreciation and amortization	3,004	2,500	2,605
Stock-based compensation expense	596	538	1,025
Decrease (increase) in other assets	193	1,556	(1,434)
Net cash provided by operating activities	29,732	42,329	33,423
Investing Activities
Purchase of premises and equipment	(1,490)	(3,403)	(1,516)
Net cash provided (used) by investing activities	(166,911)	32,138	14,802
Financing Activities
Exercise of stock options and issuance of restricted stock, net of repurchase for tax withholdings and tax benefit	300	(212)	(134)
Common stock repurchase	(2,460)	(2,097)	(389)
Cash dividends paid on common stock	(8,121)	(7,667)	(11,524)
Net increase in cash and cash equivalents	(6,935)	18,965	8,316
Cash and cash equivalents at beginning of year	58,290	39,325	31,009
Cash and cash equivalents at end of year	51,355	58,290	39,325
Common stock repurchased not yet settled	320	0	0
Parent Company [Member]
Operating Activities
Net Income	22,783	23,428	26,177
Equity in undistributed earnings of subsidiaries	(11,233)	(11,647)	(12,441)
Depreciation and amortization	1,197	1,196	1,194
Stock-based compensation expense	596	538	1,025
Increase in amount receivable from subsidiaries	498	(983)	(22)
Decrease (increase) in other assets	(845)	(1,334)	(35)
Increase in accrued expenses	459	636	3,522
Net cash provided by operating activities	13,455	11,834	19,420
Investing Activities
Purchase of premises and equipment	(896)	(1,009)	(1,286)
Net cash provided (used) by investing activities	(896)	(1,009)	(1,286)
Financing Activities
Exercise of stock options and issuance of restricted stock, net of repurchase for tax withholdings and tax benefit	300	(212)	(134)
Common stock repurchase	(2,460)	(2,097)	(389)
Cash dividends paid on common stock	(8,121)	(7,667)	(11,524)
Net cash used by financing activities	(10,281)	(9,976)	(12,047)
Net increase in cash and cash equivalents	2,278	849	6,087
Cash and cash equivalents at beginning of year	19,510	18,661	12,574
Cash and cash equivalents at end of year	21,788	19,510	18,661
Common stock repurchased not yet settled	$ 320	$ 0	$ 0