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Investment Securities - Carrying value and estimated fair value (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Apr. 01, 2022 | Dec. 31, 2021
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Schedule of Available-for-sale Securities |  |  |
Debt Securities, Amortized Cost | $ 740,468 |  | $ 1,098,373
Available-for-sale Securities, Gross Unrealized Gains | 18 |  | 20,373
Available-for-sale Securities, Gross Unrealized Losses | (91,661) |  | (9,538)
Available-for-sale investment securities | 648,825 |  | 1,109,208
Investment securities not due at a single maturity date, amortized cost | 305,107 |  | 0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 67 |  |
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | (33,925) | $ (25,300) |
Investment securities not due at a single maturity date, estimated fair value | 271,249 |  | 0
US Treasury Securities |  |  |
Schedule of Available-for-sale Securities |  |  |
Debt Securities, Amortized Cost | 9,990 |  | 9,988
Available-for-sale Securities, Gross Unrealized Gains | 0 |  | 0
Available-for-sale Securities, Gross Unrealized Losses | (1,283) |  | (63)
Available-for-sale investment securities | 8,707 |  | 9,925
U.S. Government agencies |  |  |
Schedule of Available-for-sale Securities |  |  |
Debt Securities, Amortized Cost | 107 |  | 373
Available-for-sale Securities, Gross Unrealized Gains | 0 |  | 6
Available-for-sale Securities, Gross Unrealized Losses | (9) |  | 0
Available-for-sale investment securities | 98 |  | 379
Obligations of states and political subdivisions |  |  |
Schedule of Available-for-sale Securities |  |  |
Debt Securities, Amortized Cost | 201,638 |  | 512,952
Available-for-sale Securities, Gross Unrealized Gains | 0 |  | 16,703
Available-for-sale Securities, Gross Unrealized Losses | (26,653) |  | (3,188)
Available-for-sale investment securities | 174,985 |  | 526,467
Investment securities not due at a single maturity date, amortized cost | 192,004 |  |
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 67 |  |
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | (23,166) |  |
Investment securities not due at a single maturity date, estimated fair value | 168,905 |  |
U.S. Government sponsored entities and agencies collateralized by residential mortgage obligations |  |  |
Schedule of Available-for-sale Securities |  |  |
Debt Securities, Amortized Cost | 117,292 |  | 213,471
Available-for-sale Securities, Gross Unrealized Gains | 4 |  | 2,245
Available-for-sale Securities, Gross Unrealized Losses | (7,803) |  | (1,277)
Available-for-sale investment securities | 109,493 |  | 214,439
Investment securities not due at a single maturity date, amortized cost | 10,430 |  | 0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 0 |  |
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | (1,762) |  |
Investment securities not due at a single maturity date, estimated fair value | 8,668 |  | 0
Private label residential mortgage and asset backed securities |  |  |
Schedule of Available-for-sale Securities |  |  |
Debt Securities, Amortized Cost | 411,441 |  | 317,089
Available-for-sale Securities, Gross Unrealized Gains | 14 |  | 824
Available-for-sale Securities, Gross Unrealized Losses | (55,913) |  | (4,693)
Available-for-sale investment securities | 355,542 |  | 313,220
Investment securities not due at a single maturity date, amortized cost | 56,691 |  | 0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 0 |  |
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | (5,931) |  |
Investment securities not due at a single maturity date, estimated fair value | 50,760 |  | 0
Corporate Debt Securities |  |  |
Schedule of Available-for-sale Securities |  |  |
Debt Securities, Amortized Cost |  |  | 44,500
Available-for-sale Securities, Gross Unrealized Gains |  |  | 595
Available-for-sale Securities, Gross Unrealized Losses |  |  | (317)
Available-for-sale investment securities |  |  | 44,778
Investment securities not due at a single maturity date, amortized cost | 45,982 |  | 0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 0 |  |
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | (3,066) |  |
Investment securities not due at a single maturity date, estimated fair value | $ 42,916 |  | $ 0

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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=123581744&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=123581744&loc=d3e27161-111563 + Details
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