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Securities, Securities in Continuous Unrealized Loss Position (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Securities [Abstract]
Percentage of total investment with unrealized losses	62.60%	65.60%
Available-for-sale, amortized cost [Abstract]
Less than 12 months	$ 345,997	$ 365,662
12 months or more	39,537	38,763
Total	385,534	404,425
Available-for-sale, gross unrealized losses [Abstract]
Less than 12 months	(4,763)	(5,586)
12 months or more	(1,274)	(1,193)
Total	(6,037)	(6,779)
Available-for-sale, fair value [Abstract]
Less than 12 months	341,234	360,076
12 months or more	38,263	37,570
Total	379,497	397,646
U.S. Treasury and Government Agencies [Member]
Available-for-sale, amortized cost [Abstract]
Less than 12 months	161,565	158,732
12 months or more	1,730	1,880
Total	163,295	160,612
Available-for-sale, gross unrealized losses [Abstract]
Less than 12 months	(592)	(716)
12 months or more	(23)	(27)
Total	(615)	(743)
Available-for-sale, fair value [Abstract]
Less than 12 months	160,973	158,016
12 months or more	1,707	1,853
Total	162,680	159,869
State and Political Subdivisions [Member]
Available-for-sale, amortized cost [Abstract]
Less than 12 months	40,167	53,491
12 months or more	2,089	751
Total	42,256	54,242
Available-for-sale, gross unrealized losses [Abstract]
Less than 12 months	(1,275)	(1,780)
12 months or more	(20)	(12)
Total	(1,295)	(1,792)
Available-for-sale, fair value [Abstract]
Less than 12 months	38,892	51,711
12 months or more	2,069	739
Total	40,961	52,450
U.S. Government Sponsored Agency Mortgage-backed Securities [Member]
Available-for-sale, amortized cost [Abstract]
Less than 12 months	126,765	135,939
12 months or more	30,718	31,132
Total	157,483	167,071
Available-for-sale, gross unrealized losses [Abstract]
Less than 12 months	(2,452)	(2,646)
12 months or more	(957)	(880)
Total	(3,409)	(3,526)
Available-for-sale, fair value [Abstract]
Less than 12 months	124,313	133,293
12 months or more	29,761	30,252
Total	154,074	163,545
Debt Securities [Member]
Available-for-sale, amortized cost [Abstract]
Less than 12 months	328,497	348,162
12 months or more	34,537	33,763
Total	363,034	381,925
Available-for-sale, gross unrealized losses [Abstract]
Less than 12 months	(4,319)	(5,142)
12 months or more	(1,000)	(919)
Total	(5,319)	(6,061)
Available-for-sale, fair value [Abstract]
Less than 12 months	324,178	343,020
12 months or more	33,537	32,844
Total	357,715	375,864
CRA Investments Funds [Member]
Available-for-sale, amortized cost [Abstract]
Less than 12 months	17,500	17,500
12 months or more	5,000	5,000
Total	22,500	22,500
Available-for-sale, gross unrealized losses [Abstract]
Less than 12 months	(444)	(444)
12 months or more	(274)	(274)
Total	(718)	(718)
Available-for-sale, fair value [Abstract]
Less than 12 months	17,056	17,056
12 months or more	4,726	4,726
Total	$ 21,782	$ 21,782
Severity of impairment in percentage of fair value less than cost	2.90%

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-Publisher FASB
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-Section 50
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