v3.26.3
Note 7 - Loans and the Allowance for Credit Losses - Analysis of Aging of Loans (Details) - USD ($)
$ in Thousands
Sep. 30, 2026
Dec. 31, 2025
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process $ 11,435,643 $ 11,457,558
Nonaccrual 64,330 45,915
Financial Asset, 30 to 59 Days Past Due [Member]    
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process 2,563 21,882
Financial Asset, 60 to 89 Days Past Due [Member]    
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process 3,701 8,009
Financial Asset, Equal to or Greater than 90 Days Past Due [Member]    
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process 1,160 17,472
Financial Asset, Past Due [Member]    
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process 71,754 93,278
Financial Asset, Not Past Due [Member]    
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process 11,363,889 11,364,280
Commercial Portfolio Segment [Member]    
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process 1,656,916 1,565,963
Nonaccrual 11,212 13,039
Commercial Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member]    
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process 1,580 875
Commercial Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member]    
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process 640 539
Commercial Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]    
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process 391 427
Commercial Portfolio Segment [Member] | Financial Asset, Past Due [Member]    
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process 13,823 14,880
Commercial Portfolio Segment [Member] | Financial Asset, Not Past Due [Member]    
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process 1,643,093 1,551,083
Commercial Real Estate Portfolio Segment [Member]    
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process 7,981,622 8,054,696
Nonaccrual 49,990 28,561
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member]    
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process 0 13,602
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member]    
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process 3,061 6,098
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]    
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process 0 16,276
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, Past Due [Member]    
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process 53,051 64,537
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, Not Past Due [Member]    
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process 7,928,571 7,990,159
Commercial Construction Portfolio Segment [Member]    
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process 585,707 623,902
Nonaccrual 0 0
Commercial Construction Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member]    
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process 0 0
Commercial Construction Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member]    
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process 0 0
Commercial Construction Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]    
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process 0 0
Commercial Construction Portfolio Segment [Member] | Financial Asset, Past Due [Member]    
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process 0 0
Commercial Construction Portfolio Segment [Member] | Financial Asset, Not Past Due [Member]    
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process 585,707 623,902
Residential Portfolio Segment [Member]    
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process 1,207,092 1,210,980
Nonaccrual 3,128 4,315
Residential Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member]    
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process 976 7,405
Residential Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member]    
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process 0 1,372
Residential Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]    
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process 769 769
Residential Portfolio Segment [Member] | Financial Asset, Past Due [Member]    
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process 4,873 13,861
Residential Portfolio Segment [Member] | Financial Asset, Not Past Due [Member]    
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process 1,202,219 1,197,119
Consumer Portfolio Segment [Member]    
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process 4,306 2,017
Nonaccrual 0 0
Consumer Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member]    
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process 7 0
Consumer Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member]    
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process 0 0
Consumer Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]    
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process 0 0
Consumer Portfolio Segment [Member] | Financial Asset, Past Due [Member]    
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process 7 0
Consumer Portfolio Segment [Member] | Financial Asset, Not Past Due [Member]    
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process $ 4,299 $ 2,017