Parent Company Only Financial Information (Condensed Statements of Income) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Condensed Financial Statements
Net gain on securities transactions	$ 46	$ (1)	$ 26	$ 418	$ 273	$ 112	$ 0	$ 3,163	$ 489	$ 3,548	$ 473
Net loss on other transactions									0	(4,144)	0
Total interest income									67,071	69,470	75,133
Interest on junior subordinated debentures held by subsidiary trust									0	1,913	1,979
Other expense	16,993	16,901	16,221	15,931	16,876	15,267	15,346	14,907
Applicable income tax benefit	2,301	4,381	2,510	2,318	1,665	2,310	2,471	3,079	11,510	9,525	4,596
Net income	5,114	2,517	4,921	5,022	3,874	4,824	5,030	6,657	17,574	20,385	12,555
Bank
Condensed Financial Statements
Dividends from subsidiary bank									15,000	12,750	25,500
Holding Company
Condensed Financial Statements
Net gain on securities transactions									0	273	0
Net loss on other transactions									0	(1,033)	0
Interest and other income									132	205	175
Total interest income									15,132	12,195	25,675
Interest on junior subordinated debentures held by subsidiary trust									0	1,948	2,014
Intercompany management fees									1,257	1,049	921
Other expense									3,411	2,216	1,335
Total expenses									4,668	5,213	4,270
Income before federal income taxes and equity in (excess dividends from) undistributed earnings of subsidiaries									10,464	6,982	21,405
Applicable income tax benefit									(1,510)	(2,127)	(1,734)
Equity in (excess dividends from) undistributed earnings of subsidiaries									5,600	11,276	(10,584)
Net income									$ 17,574	$ 20,385	$ 12,555