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Securities, Securities in Continuous Unrealized Loss Position (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Securities [Abstract]
Percentage of total investment with unrealized losses	38.90%	75.70%
Available-for-sale, amortized cost [Abstract]
Less than 12 months	$ 63,548	$ 163,059
12 months or more	191,356	297,524
Total	254,904	460,583
Available-for-sale, gross unrealized losses [Abstract]
Less than 12 months	(266)	(848)
12 months or more	(1,484)	(8,598)
Total	(1,750)	(9,446)
Available-for-sale, fair value [Abstract]
Less than 12 months	63,282	162,211
12 months or more	189,872	288,926
Total	253,154	451,137
U.S. Treasury and Government Agencies [Member]
Available-for-sale, amortized cost [Abstract]
Less than 12 months	25,253	78,905
12 months or more	86,397	97,955
Total	111,650	176,860
Available-for-sale, gross unrealized losses [Abstract]
Less than 12 months	(153)	(271)
12 months or more	(466)	(1,197)
Total	(619)	(1,468)
Available-for-sale, fair value [Abstract]
Less than 12 months	25,100	78,634
12 months or more	85,931	96,758
Total	111,031	175,392
State and Political Subdivisions [Member]
Available-for-sale, amortized cost [Abstract]
Less than 12 months	8,358	21,707
12 months or more	0	51,911
Total	8,358	73,618
Available-for-sale, gross unrealized losses [Abstract]
Less than 12 months	(37)	(194)
12 months or more	0	(2,231)
Total	(37)	(2,425)
Available-for-sale, fair value [Abstract]
Less than 12 months	8,321	21,513
12 months or more	0	49,680
Total	8,321	71,193
U.S. Government Sponsored Agency Mortgage-backed Securities [Member]
Available-for-sale, amortized cost [Abstract]
Less than 12 months	17,634	61,940
12 months or more	104,959	147,658
Total	122,593	209,598
Available-for-sale, gross unrealized losses [Abstract]
Less than 12 months	(70)	(377)
12 months or more	(1,018)	(5,170)
Total	(1,088)	(5,547)
Available-for-sale, fair value [Abstract]
Less than 12 months	17,564	61,563
12 months or more	103,941	142,488
Total	121,505	204,051
Other Debt Securities [Member]
Available-for-sale, amortized cost [Abstract]
Less than 12 months	12,303	507
12 months or more	0	0
Total	12,303	507
Available-for-sale, gross unrealized losses [Abstract]
Less than 12 months	(6)	(6)
12 months or more	0	0
Total	(6)	(6)
Available-for-sale, fair value [Abstract]
Less than 12 months	12,297	501
12 months or more	0	0
Total	$ 12,297	$ 501

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This item represents the aggregate amortized cost of investments in debt securities in an unrealized loss position which are categorized neither as held-to-maturity nor trading securities.

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

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