XML 55 R44.htm IDEA: XBRL DOCUMENT v3.25.3
Investment Securities - Narrative (Details)
 9 Months Ended
Sep. 30, 2025
USD ($)
security
Sep. 30, 2024
USD ($)
Dec. 31, 2024
USD ($)
security
Investment Securities      
Investment securities available-for-sale $ 1,739,423,000   $ 895,034,000
Debt securities, available-for-sale, accumulated gross unrealized gain (loss) (37,800,000)   (69,400,000)
Debt securities, available-for-sale, unrealized loss position $ 825,592,000   $ 705,274,000
Percentage of securities in unrealized loss positions, available-for-sale securities 47.50%   78.80%
Debt securities, available-for-sale, unrealized loss position, accumulated loss $ 49,239,000   $ 70,222,000
Accrued interest receivable $ 8,000,000.0   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 $ 69,856,000  
Estimated fair value of debt securities have right to call or prepay the obligations 437,500,000   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 24,200,000   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 71,500,000   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 72,200,000   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 269,600,000   7,500,000
Proceeds from sale of investment securities available-for-sale 176,312,000 0  
Gain (loss) on sale of securities 0    
US Government Sponsored Enterprises      
Investment Securities      
Investment securities available-for-sale 249,200,000   36,900,000
GSE debentures      
Investment Securities      
Investment securities available-for-sale 328,351,000   176,294,000
Debt securities, available-for-sale, accumulated gross unrealized gain (loss) $ (13,400,000)   $ (18,800,000)
AFS number of positions | security 67   34
Number of securities in unrealized loss positions | security 51   23
Purchases of securities available-for-sale $ 0 0  
GSE CMOs      
Investment Securities      
Investment securities available-for-sale 339,700,000   $ 55,500,000
Debt securities, available-for-sale, accumulated gross unrealized gain (loss) $ (4,000,000.0)   $ (7,000,000.0)
AFS number of positions | security 106   59
Number of securities in unrealized loss positions | security 57   57
Purchases of securities available-for-sale $ 0 0  
GSE MBSs      
Investment Securities      
Investment securities available-for-sale 332,400,000   $ 148,300,000
Debt securities, available-for-sale, accumulated gross unrealized gain (loss) $ (11,300,000)   $ (18,600,000)
AFS number of positions | security 193   141
Number of securities in unrealized loss positions | security 96   92
Purchases of securities available-for-sale $ 0 4,100,000  
Municipal obligations      
Investment Securities      
Investment securities available-for-sale 235,434,000   $ 20,254,000
Debt securities, available-for-sale, accumulated gross unrealized gain (loss) $ 4,700,000   $ (300,000)
AFS number of positions | security 252   39
Number of securities in unrealized loss positions | security 21   13
Purchases of securities available-for-sale $ 1,300,000 7,300,000  
Corporate debt obligations      
Investment Securities      
Investment securities available-for-sale 48,255,000   $ 12,287,000
Debt securities, available-for-sale, accumulated gross unrealized gain (loss) $ 100,000   $ 100,000
AFS number of positions | security 25   4
Number of securities in unrealized loss positions | security 4   1
Purchases of securities available-for-sale $ 0 0  
U.S. Treasury bonds      
Investment Securities      
Investment securities available-for-sale 454,800,000   $ 481,900,000
Debt securities, available-for-sale, accumulated gross unrealized gain (loss) $ (13,900,000)   $ (24,800,000)
AFS number of positions | security 59   65
Number of securities in unrealized loss positions | security 33   50
Purchases of securities available-for-sale $ 9,900,000 $ 58,400,000  
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 $ 1,300,000,000   $ 792,000,000.0
Outstanding borrowings $ 0   $ 0