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Securities, Available-for-sale Securities (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Available-for-sale [Abstract] |  |
Amortized cost | $ 601,544 | $ 602,114
Gross unrealized gains | 3,755 | 1,078
Gross unrealized losses | (6,000) | (9,446)
Fair value | 599,299 | 593,746
U.S. Treasury and Government Agencies [Member] |  |
Available-for-sale [Abstract] |  |
Amortized cost | 178,233 | 219,358
Gross unrealized gains | 195 | 48
Gross unrealized losses | (951) | (1,468)
Fair value | 177,477 | 217,938
State and Political Subdivisions [Member] |  |
Available-for-sale [Abstract] |  |
Amortized cost | 123,147 | 126,280
Gross unrealized gains | 1,524 | 633
Gross unrealized losses | (942) | (2,425)
Fair value | 123,729 | 124,488
U.S. Government Sponsored Agency Mortgage-backed Securities [Member] |  |
Available-for-sale [Abstract] |  |
Amortized cost | 299,658 | 255,969
Gross unrealized gains | 2,036 | 397
Gross unrealized losses | (4,103) | (5,547)
Fair value | 297,591 | 250,819
Other Debt Securities [Member] |  |
Available-for-sale [Abstract] |  |
Amortized cost | 506 | 507
Gross unrealized gains | 0 | 0
Gross unrealized losses | (4) | (6)
Fair value | $ 502 | $ 501

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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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- Definition Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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- Definition Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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