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Securities, Securities in Continuous Unrealized Loss Position (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Securities [Abstract]
Percentage of total investment with unrealized losses	25.40%	61.10%
Available-for-sale, amortized cost [Abstract]
Less than 12 months	$ 82,887	$ 255,346
12 months or more	65,984	112,868
Total	148,871	368,214
Available-for-sale, gross unrealized losses [Abstract]
Less than 12 months	(189)	(1,675)
12 months or more	(854)	(2,484)
Total	(1,043)	(4,159)
Available-for-sale, fair value [Abstract]
Less than 12 months	82,698	253,671
12 months or more	65,130	110,384
Total	147,828	364,055
Held-to-maturity, amortized cost [Abstract]
12 months or more		480
Held-to-maturity, gross unrealized losses [Abstract]
12 months or more		(12)
Held-to-maturity, fair value [Abstract]
12 months or more		468
U.S. Treasury and Government Agencies [Member]
Available-for-sale, amortized cost [Abstract]
Less than 12 months	51,951	142,147
12 months or more	25,000	54,773
Total	76,951	196,920
Available-for-sale, gross unrealized losses [Abstract]
Less than 12 months	(69)	(487)
12 months or more	(29)	(864)
Total	(98)	(1,351)
Available-for-sale, fair value [Abstract]
Less than 12 months	51,882	141,660
12 months or more	24,971	53,909
Total	76,853	195,569
State and Political Subdivisions [Member]
Available-for-sale, amortized cost [Abstract]
Less than 12 months	6,017	11,190
12 months or more	355	3,187
Total	6,372	14,377
Available-for-sale, gross unrealized losses [Abstract]
Less than 12 months	(40)	(106)
12 months or more	(11)	(51)
Total	(51)	(157)
Available-for-sale, fair value [Abstract]
Less than 12 months	5,977	11,084
12 months or more	344	3,136
Total	6,321	14,220
U.S. Government Sponsored Agency Mortgage-backed Securities [Member]
Available-for-sale, amortized cost [Abstract]
Less than 12 months	14,919	92,009
12 months or more	35,629	49,908
Total	50,548	141,917
Available-for-sale, gross unrealized losses [Abstract]
Less than 12 months	(34)	(899)
12 months or more	(684)	(1,371)
Total	(718)	(2,270)
Available-for-sale, fair value [Abstract]
Less than 12 months	14,885	91,110
12 months or more	34,945	48,537
Total	49,830	139,647
Debt Securities [Member]
Available-for-sale, amortized cost [Abstract]
Less than 12 months	72,887	245,346
12 months or more	60,984	107,868
Total	133,871	353,214
Available-for-sale, gross unrealized losses [Abstract]
Less than 12 months	(143)	(1,492)
12 months or more	(724)	(2,286)
Total	(867)	(3,778)
Available-for-sale, fair value [Abstract]
Less than 12 months	72,744	243,854
12 months or more	60,260	105,582
Total	133,004	349,436
CRA Investments Funds [Member]
Available-for-sale, amortized cost [Abstract]
Less than 12 months	10,000	10,000
12 months or more	5,000	5,000
Total	15,000	15,000
Available-for-sale, gross unrealized losses [Abstract]
Less than 12 months	(46)	(183)
12 months or more	(130)	(198)
Total	(176)	(381)
Available-for-sale, fair value [Abstract]
Less than 12 months	9,954	9,817
12 months or more	4,870	4,802
Total	$ 14,824	14,619
Severity of impairment in percentage of fair value less than cost	0.70%
U.S. Treasury and Government Agencies [Member]
Held-to-maturity, amortized cost [Abstract]
12 months or more		480
Held-to-maturity, gross unrealized losses [Abstract]
12 months or more		(12)
Held-to-maturity, fair value [Abstract]
12 months or more		$ 468

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