Securities, Securities in Continuous Unrealized Loss Position (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Securities [Abstract]
Percentage of total investment with unrealized losses	34.80%	44.10%
Available-for-sale, amortized cost [Abstract]
Less than 12 months	$ 89,459	$ 115,100
12 months or more	113,361	172,906
Total	202,820	288,006
Available-for-sale, gross unrealized losses [Abstract]
Less than 12 months	(399)	(663)
12 months or more	(1,636)	(4,904)
Total	(2,035)	(5,567)
Available-for-sale, fair value [Abstract]
Less than 12 months	89,060	114,437
12 months or more	111,725	168,002
Total	200,785	282,439
Held-to-maturity, amortized cost [Abstract]
12 months or more	480	480
Held-to-maturity, gross unrealized losses [Abstract]
12 months or more	(11)	(19)
Held-to-maturity, fair value [Abstract]
12 months or more	469	461
U.S. Treasury and Government Agencies [Member]
Available-for-sale, amortized cost [Abstract]
Less than 12 months	22,178	31,185
12 months or more	54,773	65,209
Total	76,951	96,394
Available-for-sale, gross unrealized losses [Abstract]
Less than 12 months	(13)	(87)
12 months or more	(388)	(2,053)
Total	(401)	(2,140)
Available-for-sale, fair value [Abstract]
Less than 12 months	22,165	31,098
12 months or more	54,385	63,156
Total	76,550	94,254
State and Political Subdivisions [Member]
Available-for-sale, amortized cost [Abstract]
Less than 12 months	17,068	8,800
12 months or more	7,297	21,308
Total	24,365	30,108
Available-for-sale, gross unrealized losses [Abstract]
Less than 12 months	(179)	(23)
12 months or more	(329)	(443)
Total	(508)	(466)
Available-for-sale, fair value [Abstract]
Less than 12 months	16,889	8,777
12 months or more	6,968	20,865
Total	23,857	29,642
U.S. Government Sponsored Agency Mortgage-backed Securities [Member]
Available-for-sale, amortized cost [Abstract]
Less than 12 months	50,213	50,115
12 months or more	51,291	86,389
Total	101,504	136,504
Available-for-sale, gross unrealized losses [Abstract]
Less than 12 months	(207)	(442)
12 months or more	(919)	(2,408)
Total	(1,126)	(2,850)
Available-for-sale, fair value [Abstract]
Less than 12 months	50,006	49,673
12 months or more	50,372	83,981
Total	100,378	133,654
Debt Securities [Member]
Available-for-sale, amortized cost [Abstract]
Less than 12 months	89,459	90,100
12 months or more	113,361	172,906
Total	202,820	263,006
Available-for-sale, gross unrealized losses [Abstract]
Less than 12 months	(399)	(552)
12 months or more	(1,636)	(4,904)
Total	(2,035)	(5,456)
Available-for-sale, fair value [Abstract]
Less than 12 months	89,060	89,548
12 months or more	111,725	168,002
Total	200,785	257,550
CRA Investments Funds [Member]
Available-for-sale, amortized cost [Abstract]
Less than 12 months	0	25,000
12 months or more	0	0
Total	0	25,000
Available-for-sale, gross unrealized losses [Abstract]
Less than 12 months	0	(111)
12 months or more	0	0
Total	0	(111)
Available-for-sale, fair value [Abstract]
Less than 12 months	0	24,889
12 months or more	0	0
Total	0	24,889
U.S. Treasury and Government Agencies [Member]
Held-to-maturity, amortized cost [Abstract]
12 months or more	480	480
Held-to-maturity, gross unrealized losses [Abstract]
12 months or more	(11)	(19)
Held-to-maturity, fair value [Abstract]
12 months or more	$ 469	$ 461