v3.26.1
Investment Securities - Amortized Cost to Approximate Fair Value (Details) - USD ($)
$ in Thousands
Mar. 31, 2026
Dec. 31, 2025
Available for sale securities:    
Amortized Cost $ 844,952 $ 865,102
Gross Unrealized Gains 17 66
Gross Unrealized Losses 1,073 110
Securities available for sale 843,896 865,058 [1]
Accrued interest on securities available for sale 4,300 3,800
Held to maturity securities:    
Amortized Cost 1,425,982 1,543,659 [1]
Gross Unrealized Gains 2,014 1,655
Gross Unrealized Losses 1,552 1,760
Fair Value 1,426,444 1,543,554
Accrued interest on securities held to maturity 4,500 5,000
Equity securities:    
FHLB and other equity securities 227,589 227,589
Treasury notes    
Available for sale securities:    
Amortized Cost 31,327 30,635
Gross Unrealized Gains 13 45
Securities available for sale 31,340 30,680
Federal Agencies    
Available for sale securities:    
Amortized Cost 259,865 259,591
Gross Unrealized Gains 4 21
Gross Unrealized Losses 1,067 104
Securities available for sale 258,802 259,508
Mortgage-backed - Agency - multi-family    
Available for sale securities:    
Amortized Cost 3,553 3,562
Gross Unrealized Losses 6 6
Securities available for sale 3,547 3,556
Mortgage-backed - Non-Agency - residential - fair value option    
Available for sale securities:    
Amortized Cost 371,222 385,460
Securities available for sale 371,222 385,460
Held to maturity securities:    
Amortized Cost 663,192 699,957
Gross Unrealized Gains 2,014 1,655
Gross Unrealized Losses   127
Fair Value 665,206 701,485
Mortgage-backed - Agency - residential - fair value option    
Available for sale securities:    
Amortized Cost 178,985 185,854
Securities available for sale 178,985 185,854
Mortgage-backed - Non-Agency - multi-family    
Held to maturity securities:    
Amortized Cost 394,844 438,430
Gross Unrealized Losses 892 950
Fair Value 393,952 437,480
Mortgage-backed - Non-Agency - healthcare    
Held to maturity securities:    
Amortized Cost 356,306 393,588
Gross Unrealized Losses 3 4
Fair Value 356,303 393,584
Mortgage-backed - Agency - multi-family    
Held to maturity securities:    
Amortized Cost 11,640 11,684
Gross Unrealized Losses 657 679
Fair Value $ 10,983 $ 11,005
[1] Derived from audited consolidated financial statements.