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Securities, Available-for-sale Securities (Details) - USD ($) $ in Thousands | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Available-for-sale [Abstract] |  |
Amortized cost | $ 1,534,312 | $ 1,461,829
Gross unrealized gains | 475 | 11,283
Gross unrealized losses | (132,660) | (17,683)
Fair value | 1,402,127 | 1,455,429
U.S. Treasury and Government Agencies [Member] |  |
Available-for-sale [Abstract] |  |
Amortized cost | 457,576 | 299,606
Gross unrealized gains | 210 | 351
Gross unrealized losses | (27,509) | (4,187)
Fair value | 430,277 | 295,770
State and Political Subdivisions [Member] |  |
Available-for-sale [Abstract] |  |
Amortized cost | 328,954 | 334,218
Gross unrealized gains | 132 | 5,524
Gross unrealized losses | (49,860) | (5,539)
Fair value | 279,226 | 334,203
U.S. Government Sponsored Agency Mortgage-backed Securities [Member] |  |
Available-for-sale [Abstract] |  |
Amortized cost | 654,315 | 733,467
Gross unrealized gains | 133 | 5,107
Gross unrealized losses | (52,880) | (7,765)
Fair value | 601,568 | 730,809
Asset-backed Securities [Member] |  |
Available-for-sale [Abstract] |  |
Amortized cost | 93,467 | 94,538
Gross unrealized gains | 0 | 301
Gross unrealized losses | (2,411) | (192)
Fair value | $ 91,056 | $ 94,647

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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 https://asc.fasb.org/extlink&oid=126970911&loc=d3e27161-111563 + Details
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