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Fair Value Measurements - Fair Value Hierarchy (Details) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Investment securities:    
Loans held for sale $ 4,400 $ 4,700
Recurring    
Investment securities:    
Loans held for sale 4,404 4,735
Total assets 2,183,376 2,241,736
Recurring | Corporate bonds    
Investment securities:    
Available-for-sale securities 9,667 9,626
Recurring | Agency bond securities    
Investment securities:    
Available-for-sale securities 198,527 200,230
Recurring | Agency mortgage-backed securities    
Investment securities:    
Available-for-sale securities 1,947,474 2,003,510
Recurring | Municipal bonds    
Investment securities:    
Available-for-sale securities 23,304 23,635
Recurring | Level 1    
Investment securities:    
Loans held for sale 0 0
Total assets 0 0
Recurring | Level 1 | Corporate bonds    
Investment securities:    
Available-for-sale securities 0 0
Recurring | Level 1 | Agency bond securities    
Investment securities:    
Available-for-sale securities 0 0
Recurring | Level 1 | Agency mortgage-backed securities    
Investment securities:    
Available-for-sale securities 0 0
Recurring | Level 1 | Municipal bonds    
Investment securities:    
Available-for-sale securities 0 0
Recurring | Level 2    
Investment securities:    
Loans held for sale 0 0
Total assets 2,178,972 2,237,001
Recurring | Level 2 | Corporate bonds    
Investment securities:    
Available-for-sale securities 9,667 9,626
Recurring | Level 2 | Agency bond securities    
Investment securities:    
Available-for-sale securities 198,527 200,230
Recurring | Level 2 | Agency mortgage-backed securities    
Investment securities:    
Available-for-sale securities 1,947,474 2,003,510
Recurring | Level 2 | Municipal bonds    
Investment securities:    
Available-for-sale securities 23,304 23,635
Recurring | Level 3    
Investment securities:    
Loans held for sale 4,404 4,735
Total assets 4,404 4,735
Recurring | Level 3 | Corporate bonds    
Investment securities:    
Available-for-sale securities 0 0
Recurring | Level 3 | Agency bond securities    
Investment securities:    
Available-for-sale securities 0 0
Recurring | Level 3 | Agency mortgage-backed securities    
Investment securities:    
Available-for-sale securities 0 0
Recurring | Level 3 | Municipal bonds    
Investment securities:    
Available-for-sale securities $ 0 $ 0