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Securities - Amortized Cost and Fair Value (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Securities Available-for-Sale
Amortized Cost	$ 419,711	$ 391,694
Gross Unrealized Gains	504	1,147
Gross Unrealized Losses	(11,379)	(7,355)
Fair Value	408,836	385,486
Securities Held-to-Maturity
Amortized Cost	250,044	259,670
Gross Unrealized Gains	8,188	5,035
Gross Unrealized Losses	(24)	(1,439)
Fair Value	258,208	263,266
U.S. Treasury
Securities Available-for-Sale
Amortized Cost	1,514	1,529
Gross Unrealized Gains	1
Gross Unrealized Losses		(2)
Fair Value	1,515	1,527
U.S. government agencies
Securities Available-for-Sale
Amortized Cost	1,690	1,711
Gross Unrealized Losses	(113)	(87)
Fair Value	1,577	1,624
States and political subdivisions
Securities Available-for-Sale
Amortized Cost	22,918	21,682
Gross Unrealized Gains	401	432
Gross Unrealized Losses	(149)	(96)
Fair Value	23,170	22,018
Corporate bonds
Securities Available-for-Sale
Amortized Cost	30,160	31,243
Gross Unrealized Gains		309
Gross Unrealized Losses	(580)	(567)
Fair Value	29,580	30,985
Collateralized mortgage obligations
Securities Available-for-Sale
Amortized Cost	72,015	65,728
Gross Unrealized Gains	53	31
Gross Unrealized Losses	(1,191)	(2,132)
Fair Value	70,877	63,627
Securities Held-to-Maturity
Amortized Cost	213,298	222,545
Gross Unrealized Gains	5,746	3,005
Gross Unrealized Losses	(24)	(1,439)
Fair Value	219,020	224,111
Asset-backed securities
Securities Available-for-Sale
Amortized Cost	195,100	175,565
Gross Unrealized Gains	49	199
Gross Unrealized Losses	(8,053)	(2,268)
Fair Value	187,096	173,496
Collateralized loan obligations
Securities Available-for-Sale
Amortized Cost	94,265	94,236
Gross Unrealized Gains		176
Gross Unrealized Losses	(1,278)	(2,203)
Fair Value	92,987	92,209
U.S. government agency mortgage-backed
Securities Available-for-Sale
Amortized Cost	2,049
Gross Unrealized Losses	(15)
Fair Value	2,034
Securities Held-to-Maturity
Amortized Cost	36,746	37,125
Gross Unrealized Gains	2,442	2,030
Fair Value	$ 39,188	$ 39,155

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