v3.25.2
Investment Securities - Narrative (Details)
 6 Months Ended
Jun. 30, 2025
USD ($)
security
Jun. 30, 2024
USD ($)
Dec. 31, 2024
USD ($)
security
Investment Securities      
Investment securities available-for-sale $ 866,684,000   $ 895,034,000
Debt securities, available-for-sale, accumulated gross unrealized gain (loss) (51,200,000)   (69,400,000)
Debt securities, available-for-sale, unrealized loss position $ 594,914,000   $ 705,274,000
Percentage of securities in unrealized loss positions, available-for-sale securities 68.60%   78.80%
Debt securities, available-for-sale, unrealized loss position, accumulated loss $ 53,501,000   $ 70,222,000
Accrued interest receivable $ 4,000,000.0   4,100,000
Number of days past due to be placed in nonaccrual status 90 days    
Purchases of securities available-for-sale $ 11,737,000 $ 41,071,000  
Estimated fair value of debt securities have right to call or prepay the obligations 112,600,000   118,600,000
Estimated fair value of debt securities that have right to call or prepay the obligations, scheduled maturities of less than one year 14,700,000   4,800,000
Estimated fair value of debt securities have right to call or prepay the obligations, scheduled maturities of after one year through five years 61,500,000   67,400,000
Estimated fair value of debt securities have right to call or prepay the obligations, scheduled maturities after six years through ten years 28,700,000   38,900,000
Estimated fair value of debt securities have right to call or prepay the obligations, scheduled maturities of which is after ten years 7,700,000   7,500,000
US Government Sponsored Enterprises      
Investment Securities      
Investment securities available-for-sale 36,600,000   36,900,000
GSE debentures      
Investment Securities      
Investment securities available-for-sale 177,685,000   176,294,000
Debt securities, available-for-sale, accumulated gross unrealized gain (loss) $ (14,200,000)   $ (18,800,000)
AFS number of positions | security 32   34
Number of securities in unrealized loss positions | security 20   23
Purchases of securities available-for-sale $ 0 0  
GSE CMOs      
Investment Securities      
Investment securities available-for-sale 54,100,000   $ 55,500,000
Debt securities, available-for-sale, accumulated gross unrealized gain (loss) $ (6,400,000)   $ (7,000,000.0)
AFS number of positions | security 58   59
Number of securities in unrealized loss positions | security 54   57
Purchases of securities available-for-sale $ 0 0  
GSE MBSs      
Investment Securities      
Investment securities available-for-sale 141,200,000   $ 148,300,000
Debt securities, available-for-sale, accumulated gross unrealized gain (loss) $ (14,300,000)   $ (18,600,000)
AFS number of positions | security 140   141
Number of securities in unrealized loss positions | security 90   92
Purchases of securities available-for-sale $ 0 0  
Municipal obligations      
Investment Securities      
Investment securities available-for-sale 18,946,000   $ 20,254,000
Debt securities, available-for-sale, accumulated gross unrealized gain (loss) $ (300,000)   $ (300,000)
AFS number of positions | security 39   39
Number of securities in unrealized loss positions | security 20   13
Purchases of securities available-for-sale $ 1,300,000 2,500,000  
Corporate debt obligations      
Investment Securities      
Investment securities available-for-sale $ 12,226,000   $ 12,287,000
Debt securities, available-for-sale, accumulated gross unrealized gain (loss)     $ 100,000
AFS number of positions | security 4   4
Number of securities in unrealized loss positions | security 1   1
Purchases of securities available-for-sale $ 0 0  
U.S. Treasury bonds      
Investment Securities      
Investment securities available-for-sale 462,100,000   $ 481,900,000
Debt securities, available-for-sale, accumulated gross unrealized gain (loss) $ (16,100,000)   $ (24,800,000)
AFS number of positions | security 61   65
Number of securities in unrealized loss positions | security 37   50
Purchases of securities available-for-sale $ 9,900,000 $ 38,600,000  
Foreign government obligations      
Investment Securities      
Investment securities available-for-sale $ 500,000   $ 499,000
AFS number of positions | security 1   1
Collateral Pledged      
Investment Securities      
Investment securities pledged as collateral $ 769,000,000.0   $ 792,000,000.0
Outstanding borrowings $ 0   $ 0