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v3.23.2

Investment Securities - Schedule of Available-for-Sale Securities and Held-to-Maturity Securities (Details) - USD ($) $ in Thousands | Jun. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 1,732,722 | $ 1,803,898
Gross Unrealized Gains | 2 | 63
Gross Unrealized Losses | (197,118) | (205,278)
Allowance for credit losses | (17) | (17)
Estimated Fair Value | 1,535,589 | 1,598,666
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 1,057,191 | 1,094,140
Allowance for credit losses | (2,010) | (766)
Total held-to-maturity securities, net of ACL | 1,055,181 | 1,093,374
Gross Unrecognized Gains | 0 | 0
Gross Unrecognized Losses | (133,878) | (125,433)
Estimated Fair Value | 923,313 | 968,707
U.S. treasury bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 49,843 | 49,793
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (3,214) | (3,466)
Allowance for credit losses | 0 | 0
Estimated Fair Value | 46,629 | 46,327
U. S. agency securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 739,585 | 747,777
Gross Unrealized Gains | 1 | 0
Gross Unrealized Losses | (74,170) | (78,049)
Allowance for credit losses | 0 | 0
Estimated Fair Value | 665,416 | 669,728
Residential mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 877,441 | 937,557
Gross Unrealized Gains | 1 | 18
Gross Unrealized Losses | (112,852) | (117,072)
Allowance for credit losses | 0 | 0
Estimated Fair Value | 764,590 | 820,503
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 705,256 | 741,057
Gross Unrecognized Gains | 0 | 0
Gross Unrecognized Losses | (89,484) | (88,390)
Estimated Fair Value | 615,772 | 652,667
Commercial mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 54,982 | 56,071
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (6,013) | (5,858)
Allowance for credit losses | 0 | 0
Estimated Fair Value | 48,969 | 50,213
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 91,838 | 92,557
Gross Unrecognized Gains | 0 | 0
Gross Unrecognized Losses | (13,480) | (11,993)
Estimated Fair Value | 78,358 | 80,564
Municipal bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 8,871 | 10,700
Gross Unrealized Gains | 0 | 45
Gross Unrealized Losses | (559) | (658)
Allowance for credit losses | 0 | 0
Estimated Fair Value | 8,312 | 10,087
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 127,825 | 128,273
Gross Unrecognized Gains | 0 | 0
Gross Unrecognized Losses | (10,705) | (12,092)
Estimated Fair Value | 117,120 | 116,181
Corporate bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 2,000 | 2,000
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (310) | (175)
Allowance for credit losses | (17) | (17)
Estimated Fair Value | 1,673 | 1,808
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 132,272 | 132,253
Gross Unrecognized Gains | 0 | 0
Gross Unrecognized Losses | (20,209) | (12,958)
Estimated Fair Value | $ 112,063 | $ 119,295

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