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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. + References No definition available. + Details
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- Definition This item represents the aggregate amortized cost of investments in debt securities categorized neither as held-to-maturity nor trading securities that have been in a continuous unrealized loss position for less than twelve months. + References No definition available. + Details
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- Definition This item represents the aggregate amortized cost of investments in debt securities categorized neither as held-to-maturity nor trading securities that have been in a continuous unrealized loss position for twelve months or longer. + References No definition available. + Details
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- Definition The percentage of total investment with unrealized losses. + References No definition available. + Details
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- Definition 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 Reference 1: http://www.xbrl.org/2003/role/disclosureRef -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 + Details
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- Definition Amount of accumulated unrealized loss on 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 12 months or longer. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -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 + Details
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- Definition 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 less than 12 months. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -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 + Details
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