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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