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Securities, Securities in Continuous Unrealized Loss Position (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Securities [Abstract]
Percentage of total investment with unrealized losses	55.90%	75.70%
Available-for-sale, amortized cost [Abstract]
Less than 12 months	$ 24,351	$ 163,059
12 months or more	317,246	297,524
Total	341,597	460,583
Available-for-sale, gross unrealized losses [Abstract]
Less than 12 months	(15)	(848)
12 months or more	(5,985)	(8,598)
Total	(6,000)	(9,446)
Available-for-sale, fair value [Abstract]
Less than 12 months	24,336	162,211
12 months or more	311,261	288,926
Total	335,597	451,137
U.S. Treasury and Government Agencies [Member]
Available-for-sale, amortized cost [Abstract]
Less than 12 months	22,910	78,905
12 months or more	120,811	97,955
Total	143,721	176,860
Available-for-sale, gross unrealized losses [Abstract]
Less than 12 months	(8)	(271)
12 months or more	(943)	(1,197)
Total	(951)	(1,468)
Available-for-sale, fair value [Abstract]
Less than 12 months	22,902	78,634
12 months or more	119,868	96,758
Total	142,770	175,392
State and Political Subdivisions [Member]
Available-for-sale, amortized cost [Abstract]
Less than 12 months	0	21,707
12 months or more	39,558	51,911
Total	39,558	73,618
Available-for-sale, gross unrealized losses [Abstract]
Less than 12 months	0	(194)
12 months or more	(942)	(2,231)
Total	(942)	(2,425)
Available-for-sale, fair value [Abstract]
Less than 12 months	0	21,513
12 months or more	38,616	49,680
Total	38,616	71,193
U.S. Government Sponsored Agency Mortgage-backed Securities [Member]
Available-for-sale, amortized cost [Abstract]
Less than 12 months	935	61,940
12 months or more	156,877	147,658
Total	157,812	209,598
Available-for-sale, gross unrealized losses [Abstract]
Less than 12 months	(3)	(377)
12 months or more	(4,100)	(5,170)
Total	(4,103)	(5,547)
Available-for-sale, fair value [Abstract]
Less than 12 months	932	61,563
12 months or more	152,777	142,488
Total	153,709	204,051
Other Debt Securities [Member]
Available-for-sale, amortized cost [Abstract]
Less than 12 months	506	507
12 months or more	0	0
Total	506	507
Available-for-sale, gross unrealized losses [Abstract]
Less than 12 months	(4)	(6)
12 months or more	0	0
Total	(4)	(6)
Available-for-sale, fair value [Abstract]
Less than 12 months	502	501
12 months or more	0	0
Total	$ 502	$ 501

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- Definition

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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The percentage of total investment with unrealized losses.

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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.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 7
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