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Securities, Securities in Continuous Unrealized Loss Position (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Securities [Abstract]
Percentage of total investment with unrealized losses	75.70%	69.50%
Available-for-sale, amortized cost [Abstract]
Less than 12 months	$ 163,059	$ 241,239
12 months or more	297,524	173,642
Total	460,583	414,881
Available-for-sale, gross unrealized losses [Abstract]
Less than 12 months	(848)	(2,004)
12 months or more	(8,598)	(5,054)
Total	(9,446)	(7,058)
Available-for-sale, fair value [Abstract]
Less than 12 months	162,211	239,235
12 months or more	288,926	168,588
Total	451,137	407,823
U.S. Treasury and Government Agencies [Member]
Available-for-sale, amortized cost [Abstract]
Less than 12 months	78,905	136,688
12 months or more	97,955	23,885
Total	176,860	160,573
Available-for-sale, gross unrealized losses [Abstract]
Less than 12 months	(271)	(840)
12 months or more	(1,197)	(332)
Total	(1,468)	(1,172)
Available-for-sale, fair value [Abstract]
Less than 12 months	78,634	135,848
12 months or more	96,758	23,553
Total	175,392	159,401
State and Political Subdivisions [Member]
Available-for-sale, amortized cost [Abstract]
Less than 12 months	21,707	34,283
12 months or more	51,911	16,930
Total	73,618	51,213
Available-for-sale, gross unrealized losses [Abstract]
Less than 12 months	(194)	(416)
12 months or more	(2,231)	(745)
Total	(2,425)	(1,161)
Available-for-sale, fair value [Abstract]
Less than 12 months	21,513	33,867
12 months or more	49,680	16,185
Total	71,193	50,052
U.S. Government Sponsored Agency Mortgage-backed Securities [Member]
Available-for-sale, amortized cost [Abstract]
Less than 12 months	61,940	62,768
12 months or more	147,658	117,827
Total	209,598	180,595
Available-for-sale, gross unrealized losses [Abstract]
Less than 12 months	(377)	(643)
12 months or more	(5,170)	(3,364)
Total	(5,547)	(4,007)
Available-for-sale, fair value [Abstract]
Less than 12 months	61,563	62,125
12 months or more	142,488	114,463
Total	204,051	176,588
Other Debt Securities [Member]
Available-for-sale, amortized cost [Abstract]
Less than 12 months	507	0
12 months or more	0	0
Total	507	0
Available-for-sale, gross unrealized losses [Abstract]
Less than 12 months	(6)	0
12 months or more	0	0
Total	(6)	0
Available-for-sale, fair value [Abstract]
Less than 12 months	501	0
12 months or more	0	0
Total	$ 501	0
Debt Securities [Member]
Available-for-sale, amortized cost [Abstract]
Less than 12 months		233,739
12 months or more		158,642
Total		392,381
Available-for-sale, gross unrealized losses [Abstract]
Less than 12 months		(1,899)
12 months or more		(4,441)
Total		(6,340)
Available-for-sale, fair value [Abstract]
Less than 12 months		231,840
12 months or more		154,201
Total		386,041
CRA Investment Funds [Member]
Available-for-sale, amortized cost [Abstract]
Less than 12 months		7,500
12 months or more		15,000
Total		22,500
Available-for-sale, gross unrealized losses [Abstract]
Less than 12 months		(105)
12 months or more		(613)
Total		(718)
Available-for-sale, fair value [Abstract]
Less than 12 months		7,395
12 months or more		14,387
Total		$ 21,782
Severity of impairment in percentage of fair value less than cost	2.90%

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Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale in a continuous loss position.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563

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