Parent Company Only Financial Information (Interim Condensed Statements of Cash Flows) (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
OPERATING ACTIVITIES
Net income	$ 9,586	$ 9,695
Adjustments to reconcile net income to cash provided by operations
Share-based payment awards	423	496
Depreciation	1,903	1,802
Changes in operating assets and liabilities which used cash
Other assets	319	(1,938)
Accrued interest and other liabilities	622	78
Net cash provided by (used in) operating activities	17,746	14,860
INVESTING ACTIVITIES
Purchases of equipment and premises	(2,134)	(2,647)
Net cash provided by (used in) investing activities	(48,142)	(56,181)
FINANCING ACTIVITIES
Net increase (decrease) in other borrowed funds	25,000	10,477
Cash dividends paid on common stock	(4,838)	(4,553)
Proceeds from the issuance of common stock	2,754	2,025
Common stock repurchased	(1,815)	(1,520)
Common stock purchased for deferred compensation obligations	(285)	(361)
Net cash provided by (used in) financing activities	27,080	37,395
Increase (decrease) in cash and cash equivalents	(3,316)	(3,926)
Cash and cash equivalents at beginning of period	24,920	28,590
Cash and cash equivalents at end of period	21,604	24,664
Parent Company [Member]
OPERATING ACTIVITIES
Net income	9,586	9,695
Adjustments to reconcile net income to cash provided by operations
Undistributed earnings of subsidiaries	(6,120)	(5,972)
Undistributed earnings of equity securities without readily determinable fair values	14	0
Share-based payment awards	423	496
Depreciation	136	84
Net amortization of AFS securities	1	3
Changes in operating assets and liabilities which used cash
Other assets	(65)	(363)
Accrued interest and other liabilities	939	(224)
Net cash provided by (used in) operating activities	4,914	3,719
INVESTING ACTIVITIES
Maturities, calls, and sales of AFS securities	395	370
Purchases of equipment and premises	(140)	(112)
Repayment of advances to subsidiaries	(99)	(50)
Net cash provided by (used in) investing activities	156	208
FINANCING ACTIVITIES
Net increase (decrease) in other borrowed funds	(800)	(297)
Cash dividends paid on common stock	(4,838)	(4,553)
Proceeds from the issuance of common stock	2,754	2,025
Common stock repurchased	(1,815)	(1,520)
Common stock purchased for deferred compensation obligations	(285)	(361)
Net cash provided by (used in) financing activities	(4,984)	(4,706)
Increase (decrease) in cash and cash equivalents	86	(779)
Cash and cash equivalents at beginning of period	332	1,474
Cash and cash equivalents at end of period	$ 418	$ 695