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Securities Securities (Reconciliation of amortized cost of held to maturity securities) (Details) - USD ($)
$ in Thousands
Sep. 30, 2024
Dec. 31, 2023
Schedule of Held-to-maturity Securities [Line Items]    
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain $ 1,126 $ 559
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss (115,976) (152,058)
Debt Securities, Held-to-maturity, Fair Value 1,377,465 1,417,608
Debt Securities, Held-to-Maturity, Allowance for Credit Loss, Excluding Accrued Interest 0 0
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss 1,492,315 1,569,107
Small Business Administration Pooled Securities [Member]    
Schedule of Held-to-maturity Securities [Line Items]    
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 482 384
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss (3,936) (6,157)
Debt Securities, Held-to-maturity, Fair Value 121,900 124,653
Debt Securities, Held-to-Maturity, Allowance for Credit Loss, Excluding Accrued Interest 0 0
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss 125,354 130,426
Collateralized Debt Obligations [Member]    
Schedule of Held-to-maturity Securities [Line Items]    
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 0  
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss (57,209) (69,606)
Debt Securities, Held-to-maturity, Fair Value 380,343 407,911
Debt Securities, Held-to-Maturity, Allowance for Credit Loss, Excluding Accrued Interest 0 0
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss 437,552 477,517
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]    
Schedule of Held-to-maturity Securities [Line Items]    
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 644 175
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss (48,044) (65,878)
Debt Securities, Held-to-maturity, Fair Value 751,519 763,728
Debt Securities, Held-to-Maturity, Allowance for Credit Loss, Excluding Accrued Interest 0 0
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss 798,919 829,431
US Treasury Securities [Member]    
Schedule of Held-to-maturity Securities [Line Items]    
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 0  
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss (6,582) (9,177)
Debt Securities, Held-to-maturity, Fair Value 94,190 91,535
Debt Securities, Held-to-Maturity, Allowance for Credit Loss, Excluding Accrued Interest 0 0
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss 100,772 100,712
U.S. government agency securities    
Schedule of Held-to-maturity Securities [Line Items]    
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 0 0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss (156) (1,113)
Debt Securities, Held-to-maturity, Fair Value 28,062 28,408
Debt Securities, Held-to-Maturity, Allowance for Credit Loss, Excluding Accrued Interest 0 0
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss 28,218 29,521
Trust Preferred Securities Subject to Mandatory Redemption [Member]    
Schedule of Held-to-maturity Securities [Line Items]    
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 0 0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss (49) (127)
Debt Securities, Held-to-maturity, Fair Value 1,451 1,373
Debt Securities, Held-to-Maturity, Allowance for Credit Loss, Excluding Accrued Interest 0 0
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss $ 1,500 $ 1,500