v3.26.1
FAIR VALUE OF FINANCIAL INSTRUMENTS (Fair Value By Balance Sheet Location) (Details) - USD ($)
$ in Thousands
Jun. 30, 2026
Dec. 31, 2025
Jun. 30, 2025
Dec. 31, 2024
Assets:        
Debt Securities, Available-for-Sale $ 2,015,891 $ 2,016,261    
Securities—held-to-maturity 787,987 814,668    
Liabilities:        
FHLB advances at fair value 320,000 150,000    
Recurring [Member]        
Assets:        
Debt Securities, Available-for-Sale 2,015,891 2,016,261    
Interest rate swaps [Member] | Recurring [Member]        
Assets:        
Derivatives: 8,531 9,978    
Liabilities:        
Derivatives: 19,007 19,207    
Risk participation agreements | Recurring [Member]        
Liabilities:        
Derivatives: 2 5    
Interest rate lock and forward sale commitments [Member] | Recurring [Member]        
Assets:        
Derivatives: 301 333    
Liabilities:        
Derivatives: 180 151    
Fair Value, Inputs, Level 2 [Member] | Reported Value Measurement [Member]        
Assets:        
Debt Securities, Available-for-Sale 1,985,530 1,985,990    
Securities—held-to-maturity 924,293 955,459    
Loans receivable held for sale 27,160 42,902    
Liabilities:        
Demand, interest checking and money market accounts 8,462,960 8,486,920    
Regular savings 3,853,612 3,723,922    
Certificates of deposit 1,473,021 1,532,304    
FHLB advances at fair value 320,000 150,000    
Other borrowings 114,497 107,715    
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member]        
Assets:        
Debt Securities, Available-for-Sale 1,985,530 1,985,990    
Securities—held-to-maturity 783,000 808,965    
Loans receivable held for sale 27,203 43,062    
Liabilities:        
Demand, interest checking and money market accounts 8,462,960 8,486,920    
Regular savings 3,853,612 3,723,922    
Certificates of deposit 1,466,034 1,527,803    
FHLB advances at fair value 320,000 150,000    
Other borrowings 114,497 107,715    
Fair Value, Inputs, Level 2 [Member] | Recurring [Member]        
Assets:        
Debt Securities, Available-for-Sale 1,985,530 1,985,990    
Fair Value, Inputs, Level 2 [Member] | Interest rate swaps [Member] | Reported Value Measurement [Member]        
Assets:        
Derivatives: 8,531 9,978    
Liabilities:        
Derivatives: 19,007 19,207    
Fair Value, Inputs, Level 2 [Member] | Interest rate swaps [Member] | Estimate of Fair Value Measurement [Member]        
Assets:        
Derivatives: 8,531 9,978    
Liabilities:        
Derivatives: 19,007 19,207    
Fair Value, Inputs, Level 2 [Member] | Interest rate swaps [Member] | Recurring [Member]        
Assets:        
Derivatives: 8,531 9,978    
Liabilities:        
Derivatives: 19,007 19,207    
Fair Value, Inputs, Level 2 [Member] | Risk participation agreements | Reported Value Measurement [Member]        
Liabilities:        
Derivatives: 2 5    
Fair Value, Inputs, Level 2 [Member] | Risk participation agreements | Estimate of Fair Value Measurement [Member]        
Liabilities:        
Derivatives: 2 5    
Fair Value, Inputs, Level 2 [Member] | Risk participation agreements | Recurring [Member]        
Liabilities:        
Derivatives: 2 5    
Fair Value, Inputs, Level 2 [Member] | Interest rate lock and forward sale commitments [Member] | Recurring [Member]        
Assets:        
Derivatives: 0 0    
Liabilities:        
Derivatives: 91 83    
Fair Value, Inputs, Level 3 [Member] | Reported Value Measurement [Member]        
Assets:        
Debt Securities, Available-for-Sale 30,361 30,271    
Securities—held-to-maturity 5,016 5,737    
Loans receivable 11,832,561 11,561,411    
FHLB stock 24,209 16,476    
Mortgage servicing rights 11,316 11,498    
SBA servicing asset 1,078 1,104    
Investments in limited partnerships 16,105 15,566    
Liabilities:        
Junior subordinated debentures at fair value 79,652 79,151    
Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value Measurement [Member]        
Assets:        
Debt Securities, Available-for-Sale 30,361 30,271    
Securities—held-to-maturity 4,987 5,703    
Loans receivable 11,827,479 11,497,137    
FHLB stock 24,209 16,476    
Mortgage servicing rights 37,538 34,862    
SBA servicing asset 1,078 1,104    
Investments in limited partnerships 16,105 15,566    
Liabilities:        
Junior subordinated debentures at fair value 79,652 79,151    
Fair Value, Inputs, Level 3 [Member] | Recurring [Member]        
Assets:        
Debt Securities, Available-for-Sale 30,361 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: 301 333    
Liabilities:        
Derivatives: 180 151    
Fair Value, Inputs, Level 3 [Member] | Interest Rate Forward Sales Commitments [Member] | Estimate of Fair Value Measurement [Member]        
Assets:        
Derivatives: 301 333    
Liabilities:        
Derivatives: 180 151    
Fair Value, Inputs, Level 3 [Member] | Risk participation agreements | Recurring [Member]        
Liabilities:        
Derivatives: 0 0    
Fair Value, Inputs, Level 3 [Member] | Interest Rate Lock Commitments [Member] | Recurring [Member]        
Assets:        
Derivatives: (212)   $ 491 $ 108
Fair Value, Inputs, Level 3 [Member] | Interest rate lock and forward sale commitments [Member] | Recurring [Member]        
Assets:        
Derivatives: 301 333    
Liabilities:        
Derivatives: 89 68    
Level 1 [Member] | Reported Value Measurement [Member]        
Assets:        
Cash and cash equivalents 435,452 422,640    
Equity securities 678 406    
Bank-owned life insurance 324,164 319,347    
Level 1 [Member] | Estimate of Fair Value Measurement [Member]        
Assets:        
Cash and cash equivalents 435,452 422,640    
Equity securities 678 406    
Bank-owned life insurance 324,164 319,347    
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