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Securities, Available-for-sale Securities (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Available-for-sale [Abstract] |  |
Amortized cost | $ 625,914 | $ 593,945
Gross unrealized gains | 12,435 | 7,860
Gross unrealized losses | (4,870) | (1,961)
Fair value | 633,479 | 599,844
U.S. Treasury and Government Agencies [Member] |  |
Available-for-sale [Abstract] |  |
Amortized cost | 159,199 | 171,250
Gross unrealized gains | 1,009 | 476
Gross unrealized losses | (337) | (576)
Fair value | 159,871 | 171,150
State and Political Subdivisions [Member] |  |
Available-for-sale [Abstract] |  |
Amortized cost | 96,171 | 99,403
Gross unrealized gains | 3,068 | 2,941
Gross unrealized losses | (43) | (37)
Fair value | 99,196 | 102,307
U.S. Government Sponsored Agency Mortgage-backed Securities [Member] |  |
Available-for-sale [Abstract] |  |
Amortized cost | 313,979 | 291,874
Gross unrealized gains | 8,358 | 4,443
Gross unrealized losses | (1,294) | (1,072)
Fair value | 321,043 | 295,245
Other Debt Securities [Member] |  |
Available-for-sale [Abstract] |  |
Amortized cost | 56,565 | 31,418
Gross unrealized gains | 0 | 0
Gross unrealized losses | (3,196) | (276)
Fair value | $ 53,369 | $ 31,142

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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=118939692&loc=d3e27161-111563 + Details
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