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FAIR VALUE OF FINANCIAL INSTRUMENTS (Fair Value By Balance Sheet Location) (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Assets:    
Debt Securities, Available-for-Sale $ 2,018,525 $ 2,104,511
Securities—held-to-maturity 815,434 825,528
Liabilities:    
FHLB advances at fair value 100,000 290,000
Fair Value, Inputs, Level 2 [Member] | Reported Value Measurement [Member]    
Assets:    
Debt Securities, Available-for-Sale 1,989,454 2,078,826
Securities—held-to-maturity 965,401 995,237
Loans receivable held for sale 20,334 32,021
Liabilities:    
Demand, interest checking and money market accounts 8,769,730 8,536,303
Regular savings 3,705,823 3,478,423
Certificates of deposit 1,540,382 1,499,672
FHLB advances at fair value 100,000 290,000
Other borrowings 120,536 125,257
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member]    
Assets:    
Debt Securities, Available-for-Sale 1,989,454 2,078,826
Securities—held-to-maturity 809,271 819,230
Loans receivable held for sale 20,599 32,215
Liabilities:    
Demand, interest checking and money market accounts 8,769,730 8,536,303
Regular savings 3,705,823 3,478,423
Certificates of deposit 1,535,106 1,492,829
FHLB advances at fair value 100,000 290,000
Other borrowings 120,536 125,257
Subordinated notes, net 0 78,832
Fair Value, Inputs, Level 2 [Member]    
Liabilities:    
Subordinated notes, net 0 80,278
Fair Value, Inputs, Level 2 [Member] | Interest rate swaps [Member] | Reported Value Measurement [Member]    
Assets:    
Derivatives: 10,292 14,507
Liabilities:    
Derivatives: 19,913 30,184
Fair Value, Inputs, Level 2 [Member] | Interest rate swaps [Member] | Estimate of Fair Value Measurement [Member]    
Assets:    
Derivatives: 10,292 14,507
Liabilities:    
Derivatives: 19,913 30,184
Fair Value, Inputs, Level 2 [Member] | Risk participation agreements | Reported Value Measurement [Member]    
Liabilities:    
Derivatives: 8 6
Fair Value, Inputs, Level 2 [Member] | Risk participation agreements | Estimate of Fair Value Measurement [Member]    
Liabilities:    
Derivatives: 8 6
Fair Value, Inputs, Level 3 [Member] | Reported Value Measurement [Member]    
Assets:    
Debt Securities, Available-for-Sale 29,071 25,685
Securities—held-to-maturity 6,202 6,327
Loans receivable 11,542,831 11,199,135
FHLB stock 14,226 22,451
Mortgage servicing rights 11,962 12,618
SBA servicing asset 1,122 869
Investments in limited partnerships 16,929 13,955
Liabilities:    
Junior subordinated debentures at fair value 76,251 67,477
Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value Measurement [Member]    
Assets:    
Debt Securities, Available-for-Sale 29,071 25,685
Securities—held-to-maturity 6,163 6,298
Loans receivable 11,445,723 10,894,024
FHLB stock 14,226 22,451
Mortgage servicing rights 35,526 37,926
SBA servicing asset 1,122 869
Investments in limited partnerships 16,929 13,955
Liabilities:    
Junior subordinated debentures at fair value 76,251 67,477
Fair Value, Inputs, Level 3 [Member] | Interest Rate Forward Sales Commitments [Member] | Reported Value Measurement [Member]    
Assets:    
Derivatives: 319 331
Liabilities:    
Derivatives: 106 2
Fair Value, Inputs, Level 3 [Member] | Interest Rate Forward Sales Commitments [Member] | Estimate of Fair Value Measurement [Member]    
Assets:    
Derivatives: 319 331
Liabilities:    
Derivatives: 106 2
Level 1 [Member] | Reported Value Measurement [Member]    
Assets:    
Cash and cash equivalents 672,863 501,858
Equity securities 510 481
Bank-owned life insurance 317,469 312,549
Level 1 [Member] | Estimate of Fair Value Measurement [Member]    
Assets:    
Cash and cash equivalents 672,863 501,858
Equity securities 510 481
Bank-owned life insurance $ 317,469 $ 312,549