FDIC Indemnification Asset (Details) (USD $)	0 Months Ended	12 Months Ended
	Apr. 15, 2011	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
FDIC Indemnification Asset [Abstract]
FDIC loss-share agreement covered loans and other real estate losses (in hundredths)	80.00%
FDIC True-up provisions		$ 2,100,000	$ 1,700,000
Reduction of FDIC indemnification asset included in other noninterest income		800,000	3,400,000	3,700,000
Balance, beginning of period		14,347,000	21,774,000	28,348,000
(Amortization) Accretion		(2,074,000)	(2,469,000)	245,000
Transfers to FDIC claims		(4,443,000)	(851,000)	(2,544,000)
Change in expected cash flows		(517,000)	(3,472,000)	(3,761,000)
Change in FDIC true-up provision		(316,000)	(635,000)	(514,000)
Balance, end of period		$ 6,997,000	$ 14,347,000	$ 21,774,000