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Investment Securities - Gross Gains and Losses (Details) - USD ($)
$ in Thousands
Jun. 30, 2023
Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]    
Amortized cost $ 2,710,693 $ 2,791,843
Gross unrealized gains 4 8
Gross unrealized losses (426,284) (428,164)
Fair value 2,284,413 2,363,687
Corporate bonds    
Debt Securities, Available-for-sale [Line Items]    
Amortized cost 10,000 10,000
Gross unrealized gains 0 0
Gross unrealized losses (642) (654)
Fair value 9,358 9,346
Agency bond securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized cost 240,358 240,272
Gross unrealized gains 0 0
Gross unrealized losses (45,237) (47,166)
Fair value 195,121 193,106
Agency mortgage-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized cost 2,430,788 2,511,958
Gross unrealized gains 4 8
Gross unrealized losses (374,346) (373,704)
Fair value 2,056,446 2,138,262
Municipal bonds    
Debt Securities, Available-for-sale [Line Items]    
Amortized cost 29,547 29,613
Gross unrealized gains 0 0
Gross unrealized losses (6,059) (6,640)
Fair value $ 23,488 $ 22,973