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Securities, Securities in Continuous Unrealized Loss Position (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Securities [Abstract]
Percentage of total investment with unrealized losses	81.20%	69.50%
Available-for-sale, amortized cost [Abstract]
Less than 12 months	$ 299,271	$ 241,239
12 months or more	189,475	173,642
Total	488,746	414,881
Available-for-sale, gross unrealized losses [Abstract]
Less than 12 months	(5,187)	(2,004)
12 months or more	(7,167)	(5,054)
Total	(12,354)	(7,058)
Available-for-sale, fair value [Abstract]
Less than 12 months	294,084	239,235
12 months or more	182,308	168,588
Total	476,392	407,823
U.S. Treasury and Government Agencies [Member]
Available-for-sale, amortized cost [Abstract]
Less than 12 months	170,250	136,688
12 months or more	44,226	23,885
Total	214,476	160,573
Available-for-sale, gross unrealized losses [Abstract]
Less than 12 months	(2,091)	(840)
12 months or more	(790)	(332)
Total	(2,881)	(1,172)
Available-for-sale, fair value [Abstract]
Less than 12 months	168,159	135,848
12 months or more	43,436	23,553
Total	211,595	159,401
State and Political Subdivisions [Member]
Available-for-sale, amortized cost [Abstract]
Less than 12 months	55,441	34,283
12 months or more	18,219	16,930
Total	73,660	51,213
Available-for-sale, gross unrealized losses [Abstract]
Less than 12 months	(1,492)	(416)
12 months or more	(1,522)	(745)
Total	(3,014)	(1,161)
Available-for-sale, fair value [Abstract]
Less than 12 months	53,949	33,867
12 months or more	16,697	16,185
Total	70,646	50,052
U.S. Government Sponsored Agency Mortgage-backed Securities [Member]
Available-for-sale, amortized cost [Abstract]
Less than 12 months	73,073	62,768
12 months or more	127,030	117,827
Total	200,103	180,595
Available-for-sale, gross unrealized losses [Abstract]
Less than 12 months	(1,599)	(643)
12 months or more	(4,855)	(3,364)
Total	(6,454)	(4,007)
Available-for-sale, fair value [Abstract]
Less than 12 months	71,474	62,125
12 months or more	122,175	114,463
Total	193,649	176,588
Other Debt Securities [Member]
Available-for-sale, amortized cost [Abstract]
Less than 12 months	507
12 months or more	0
Total	507
Available-for-sale, gross unrealized losses [Abstract]
Less than 12 months	(5)
12 months or more	0
Total	(5)
Available-for-sale, fair value [Abstract]
Less than 12 months	502
12 months or more	0
Total	$ 502
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 Investments 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

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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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