v3.26.1
FAIR VALUE OF FINANCIAL INSTRUMENTS (Fair Value By Balance Sheet Location) (Details) - USD ($)
$ in Thousands
Mar. 31, 2026
Dec. 31, 2025
Assets:    
Debt Securities, Available-for-Sale $ 2,035,021 $ 2,016,261
Securities—held-to-maturity 791,763 814,668
Liabilities:    
FHLB advances at fair value 0 150,000
Subordinated notes, net 0 0
Recurring [Member]    
Assets:    
Debt Securities, Available-for-Sale 2,035,021 2,016,261
Interest rate swaps [Member] | Recurring [Member]    
Assets:    
Derivatives: 9,878 9,978
Liabilities:    
Derivatives: 19,509 19,207
Risk participation agreements | Recurring [Member]    
Liabilities:    
Derivatives: 6 5
Interest rate lock and forward sale commitments [Member] | Recurring [Member]    
Assets:    
Derivatives: 476 333
Liabilities:    
Derivatives: 85 151
Fair Value, Inputs, Level 2 [Member] | Reported Value Measurement [Member]    
Assets:    
Debt Securities, Available-for-Sale 2,004,707 1,985,990
Securities—held-to-maturity 938,636 955,459
Loans receivable held for sale 33,778 42,902
Liabilities:    
Demand, interest checking and money market accounts 8,516,020 8,486,920
Regular savings 3,859,530 3,723,922
Certificates of deposit 1,464,814 1,532,304
FHLB advances at fair value 0 150,000
Other borrowings 115,723 107,715
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member]    
Assets:    
Debt Securities, Available-for-Sale 2,004,707 1,985,990
Securities—held-to-maturity 786,740 808,965
Loans receivable held for sale 33,845 43,062
Liabilities:    
Demand, interest checking and money market accounts 8,516,020 8,486,920
Regular savings 3,859,530 3,723,922
Certificates of deposit 1,458,958 1,527,803
FHLB advances at fair value 0 150,000
Other borrowings 115,723 107,715
Subordinated notes, net 0 0
Fair Value, Inputs, Level 2 [Member] | Recurring [Member]    
Assets:    
Debt Securities, Available-for-Sale 2,004,707 1,985,990
Fair Value, Inputs, Level 2 [Member] | Interest rate swaps [Member] | Reported Value Measurement [Member]    
Assets:    
Derivatives: 9,878 9,978
Liabilities:    
Derivatives: 19,509 19,207
Fair Value, Inputs, Level 2 [Member] | Interest rate swaps [Member] | Estimate of Fair Value Measurement [Member]    
Assets:    
Derivatives: 9,878 9,978
Liabilities:    
Derivatives: 19,509 19,207
Fair Value, Inputs, Level 2 [Member] | Interest rate swaps [Member] | Recurring [Member]    
Assets:    
Derivatives: 9,878 9,978
Liabilities:    
Derivatives: 19,509 19,207
Fair Value, Inputs, Level 2 [Member] | Risk participation agreements | Reported Value Measurement [Member]    
Liabilities:    
Derivatives: 6 5
Fair Value, Inputs, Level 2 [Member] | Risk participation agreements | Estimate of Fair Value Measurement [Member]    
Liabilities:    
Derivatives: 6 5
Fair Value, Inputs, Level 2 [Member] | Risk participation agreements | Recurring [Member]    
Liabilities:    
Derivatives: 6 5
Fair Value, Inputs, Level 2 [Member] | Interest rate lock and forward sale commitments [Member] | Recurring [Member]    
Assets:    
Derivatives: 446 0
Liabilities:    
Derivatives: 0 83
Fair Value, Inputs, Level 3 [Member] | Reported Value Measurement [Member]    
Assets:    
Debt Securities, Available-for-Sale 30,314 30,271
Securities—held-to-maturity 5,052 5,737
Loans receivable 11,547,274 11,561,411
FHLB stock 9,809 16,476
Mortgage servicing rights 11,321 11,498
SBA servicing asset 1,091 1,104
Investments in limited partnerships 15,881 15,566
Liabilities:    
Junior subordinated debentures at fair value 79,472 79,151
Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value Measurement [Member]    
Assets:    
Debt Securities, Available-for-Sale 30,314 30,271
Securities—held-to-maturity 5,023 5,703
Loans receivable 11,493,796 11,497,137
FHLB stock 9,809 16,476
Mortgage servicing rights 36,095 34,862
SBA servicing asset 1,091 1,104
Investments in limited partnerships 15,881 15,566
Liabilities:    
Junior subordinated debentures at fair value 79,472 79,151
Fair Value, Inputs, Level 3 [Member] | Recurring [Member]    
Assets:    
Debt Securities, Available-for-Sale 30,314 30,271
Fair Value, Inputs, Level 3 [Member] | Interest rate swaps [Member] | Recurring [Member]    
Assets:    
Derivatives: 0 0
Liabilities:    
Derivatives: 0 0
Fair Value, Inputs, Level 3 [Member] | Interest Rate Forward Sales Commitments [Member] | Reported Value Measurement [Member]    
Assets:    
Derivatives: 476 333
Liabilities:    
Derivatives: 85 151
Fair Value, Inputs, Level 3 [Member] | Interest Rate Forward Sales Commitments [Member] | Estimate of Fair Value Measurement [Member]    
Assets:    
Derivatives: 476 333
Liabilities:    
Derivatives: 85 151
Fair Value, Inputs, Level 3 [Member] | Risk participation agreements | Recurring [Member]    
Liabilities:    
Derivatives: 0 0
Fair Value, Inputs, Level 3 [Member] | Interest rate lock and forward sale commitments [Member] | Recurring [Member]    
Assets:    
Derivatives: 30 333
Liabilities:    
Derivatives: 85 68
Level 1 [Member] | Reported Value Measurement [Member]    
Assets:    
Cash and cash equivalents 439,239 422,640
Equity securities 510 406
Bank-owned life insurance 321,660 319,347
Level 1 [Member] | Estimate of Fair Value Measurement [Member]    
Assets:    
Cash and cash equivalents 439,239 422,640
Equity securities 510 406
Bank-owned life insurance 321,660 319,347
Level 1 [Member] | Recurring [Member]    
Assets:    
Debt Securities, Available-for-Sale 0 0
Level 1 [Member] | Interest rate swaps [Member] | Recurring [Member]    
Assets:    
Derivatives: 0 0
Liabilities:    
Derivatives: 0 0
Level 1 [Member] | Risk participation agreements | Recurring [Member]    
Liabilities:    
Derivatives: 0 0
Level 1 [Member] | Interest rate lock and forward sale commitments [Member] | Recurring [Member]    
Assets:    
Derivatives: 0 0
Liabilities:    
Derivatives: $ 0 $ 0