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Securities, Securities in Continuous Unrealized Loss Position (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Securities [Abstract]
Percentage of total investment with unrealized losses	69.50%	65.60%
Available-for-sale, amortized cost [Abstract]
Less than 12 months	$ 241,239	$ 365,662
12 months or more	173,642	38,763
Total	414,881	404,425
Available-for-sale, gross unrealized losses [Abstract]
Less than 12 months	(2,004)	(5,586)
12 months or more	(5,054)	(1,193)
Total	(7,058)	(6,779)
Available-for-sale, fair value [Abstract]
Less than 12 months	239,235	360,076
12 months or more	168,588	37,570
Total	407,823	397,646
U.S. Treasury and Government Agencies [Member]
Available-for-sale, amortized cost [Abstract]
Less than 12 months	136,688	158,732
12 months or more	23,885	1,880
Total	160,573	160,612
Available-for-sale, gross unrealized losses [Abstract]
Less than 12 months	(840)	(716)
12 months or more	(332)	(27)
Total	(1,172)	(743)
Available-for-sale, fair value [Abstract]
Less than 12 months	135,848	158,016
12 months or more	23,553	1,853
Total	159,401	159,869
State and Political Subdivisions [Member]
Available-for-sale, amortized cost [Abstract]
Less than 12 months	34,283	53,491
12 months or more	16,930	751
Total	51,213	54,242
Available-for-sale, gross unrealized losses [Abstract]
Less than 12 months	(416)	(1,780)
12 months or more	(745)	(12)
Total	(1,161)	(1,792)
Available-for-sale, fair value [Abstract]
Less than 12 months	33,867	51,711
12 months or more	16,185	739
Total	50,052	52,450
U.S. Government Sponsored Agency Mortgage-backed Securities [Member]
Available-for-sale, amortized cost [Abstract]
Less than 12 months	62,768	135,939
12 months or more	117,827	31,132
Total	180,595	167,071
Available-for-sale, gross unrealized losses [Abstract]
Less than 12 months	(643)	(2,646)
12 months or more	(3,364)	(880)
Total	(4,007)	(3,526)
Available-for-sale, fair value [Abstract]
Less than 12 months	62,125	133,293
12 months or more	114,463	30,252
Total	176,588	163,545
Other Debt Securities [Member]
Available-for-sale, amortized cost [Abstract]
Less than 12 months	0	0
12 months or more	0	0
Total	0	0
Available-for-sale, gross unrealized losses [Abstract]
Less than 12 months	0	0
12 months or more	0	0
Total	0	0
Available-for-sale, fair value [Abstract]
Less than 12 months	0	0
12 months or more	0	0
Total	0	0
Debt Securities [Member]
Available-for-sale, amortized cost [Abstract]
Less than 12 months	233,739	348,162
12 months or more	158,642	33,763
Total	392,381	381,925
Available-for-sale, gross unrealized losses [Abstract]
Less than 12 months	(1,899)	(5,142)
12 months or more	(4,441)	(919)
Total	(6,340)	(6,061)
Available-for-sale, fair value [Abstract]
Less than 12 months	231,840	343,020
12 months or more	154,201	32,844
Total	386,041	375,864
CRA Investment 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	(105)	(444)
12 months or more	(613)	(274)
Total	(718)	(718)
Available-for-sale, fair value [Abstract]
Less than 12 months	7,395	17,056
12 months or more	14,387	4,726
Total	$ 21,782	$ 21,782
Severity of impairment in percentage of fair value less than cost	2.90%

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