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Securities, Securities in Continuous Unrealized Loss Position (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Securities [Abstract]
Percentage of total investment with unrealized losses	66.50%	65.60%
Available-for-sale, amortized cost [Abstract]
Less than 12 months	$ 242,561	$ 365,662
12 months or more	164,103	38,763
Total	406,664	404,425
Available-for-sale, gross unrealized losses [Abstract]
Less than 12 months	(1,099)	(5,586)
12 months or more	(3,874)	(1,193)
Total	(4,973)	(6,779)
Available-for-sale, fair value [Abstract]
Less than 12 months	241,462	360,076
12 months or more	160,229	37,570
Total	401,691	397,646
U.S. Treasury and Government Agencies [Member]
Available-for-sale, amortized cost [Abstract]
Less than 12 months	143,007	158,732
12 months or more	21,559	1,880
Total	164,566	160,612
Available-for-sale, gross unrealized losses [Abstract]
Less than 12 months	(471)	(716)
12 months or more	(17)	(27)
Total	(488)	(743)
Available-for-sale, fair value [Abstract]
Less than 12 months	142,536	158,016
12 months or more	21,542	1,853
Total	164,078	159,869
State and Political Subdivisions [Member]
Available-for-sale, amortized cost [Abstract]
Less than 12 months	20,141	53,491
12 months or more	13,832	751
Total	33,973	54,242
Available-for-sale, gross unrealized losses [Abstract]
Less than 12 months	(236)	(1,780)
12 months or more	(617)	(12)
Total	(853)	(1,792)
Available-for-sale, fair value [Abstract]
Less than 12 months	19,905	51,711
12 months or more	13,215	739
Total	33,120	52,450
U.S. Government Sponsored Agency Mortgage-backed Securities [Member]
Available-for-sale, amortized cost [Abstract]
Less than 12 months	71,913	135,939
12 months or more	113,712	31,132
Total	185,625	167,071
Available-for-sale, gross unrealized losses [Abstract]
Less than 12 months	(336)	(2,646)
12 months or more	(2,723)	(880)
Total	(3,059)	(3,526)
Available-for-sale, fair value [Abstract]
Less than 12 months	71,577	133,293
12 months or more	110,989	30,252
Total	182,566	163,545
Debt Securities [Member]
Available-for-sale, amortized cost [Abstract]
Less than 12 months	235,061	348,162
12 months or more	149,103	33,763
Total	384,164	381,925
Available-for-sale, gross unrealized losses [Abstract]
Less than 12 months	(1,043)	(5,142)
12 months or more	(3,357)	(919)
Total	(4,400)	(6,061)
Available-for-sale, fair value [Abstract]
Less than 12 months	234,018	343,020
12 months or more	145,746	32,844
Total	379,764	375,864
CRA Investments Funds [Member]
Available-for-sale, amortized cost [Abstract]
Less than 12 months	7,500	17,500
12 months or more	15,000	5,000
Total	22,500	22,500
Available-for-sale, gross unrealized losses [Abstract]
Less than 12 months	(56)	(444)
12 months or more	(517)	(274)
Total	(573)	(718)
Available-for-sale, fair value [Abstract]
Less than 12 months	7,444	17,056
12 months or more	14,483	4,726
Total	21,927	21,782
Available-for-sale equity securities [Abstract]
Fair value	24,520	24,358
Gross unrealized losses	$ (573)	$ (718)
Severity of impairment in percentage of fair value less than cost	2.30%
CRA Investments Funds [Member] | Fixed Income Mutual Funds [Member]
Available-for-sale equity securities [Abstract]
Fair value	$ 24,500
Gross unrealized losses	$ (480)

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