Quarterly report [Sections 13 or 15(d)]

Loans - Allowance for Credit Losses by Portfolio Segment as a Percentage of Recorded Total Allowance for Credit Losses and Aggregate Recorded Investment of Loans Receivable (Detail)

v3.26.3
Loans - Allowance for Credit Losses by Portfolio Segment as a Percentage of Recorded Total Allowance for Credit Losses and Aggregate Recorded Investment of Loans Receivable (Detail) - USD ($)
$ in Thousands
Sep. 30, 2026
Dec. 31, 2025
Financing Receivable Allowance For Credit Losses [Line Items]    
Allowance Amount $ 70,810 $ 69,903
Percentage of Total Allowance 100.00% 100.00%
Total Loans $ 6,568,701 $ 6,563,368
Percentage of Total Loans 100.00% 100.00%
Residential    
Financing Receivable Allowance For Credit Losses [Line Items]    
Total Loans $ 1,001,824 $ 1,049,872
Real Estate    
Financing Receivable Allowance For Credit Losses [Line Items]    
Allowance Amount $ 51,648 $ 51,670
Percentage of Total Allowance 72.90% 73.90%
Total Loans $ 5,057,488 $ 5,079,977
Percentage of Total Loans 77.00% 77.50%
Real Estate | Retail    
Financing Receivable Allowance For Credit Losses [Line Items]    
Allowance Amount $ 8,424 $ 9,999
Percentage of Total Allowance 11.90% 14.30%
Total Loans $ 1,150,350 $ 1,132,439
Percentage of Total Loans 17.50% 17.30%
Real Estate | Hospitality    
Financing Receivable Allowance For Credit Losses [Line Items]    
Allowance Amount $ 7,086 $ 8,737
Percentage of Total Allowance 10.00% 12.50%
Total Loans $ 883,683 $ 847,989
Percentage of Total Loans 13.50% 12.90%
Real Estate | Office    
Financing Receivable Allowance For Credit Losses [Line Items]    
Allowance Amount $ 4,560 $ 5,700
Percentage of Total Allowance 6.50% 8.20%
Total Loans $ 483,763 $ 503,268
Percentage of Total Loans 7.40% 7.70%
Real Estate | Other    
Financing Receivable Allowance For Credit Losses [Line Items]    
Allowance Amount $ 19,834 $ 14,078
Percentage of Total Allowance 28.10% 20.10%
Total Loans $ 1,526,670 $ 1,532,667
Percentage of Total Loans 23.20% 23.40%
Real Estate | Total commercial property loans    
Financing Receivable Allowance For Credit Losses [Line Items]    
Allowance Amount $ 39,904 $ 38,514
Percentage of Total Allowance 56.50% 55.10%
Total Loans $ 4,044,466 $ 4,016,363
Percentage of Total Loans 61.60% 61.30%
Real Estate | Construction    
Financing Receivable Allowance For Credit Losses [Line Items]    
Allowance Amount $ 132 $ 208
Percentage of Total Allowance 0.10% 0.30%
Total Loans $ 11,198 $ 13,742
Percentage of Total Loans 0.20% 0.20%
Real Estate | Residential    
Financing Receivable Allowance For Credit Losses [Line Items]    
Allowance Amount $ 11,612 $ 12,948
Percentage of Total Allowance 16.30% 18.50%
Total Loans $ 1,001,824 $ 1,049,872
Percentage of Total Loans 15.20% 16.00%
Commercial and Industrial    
Financing Receivable Allowance For Credit Losses [Line Items]    
Allowance Amount $ 8,117 $ 7,792
Percentage of Total Allowance 11.50% 11.10%
Total Loans $ 1,171,614 $ 1,074,908
Percentage of Total Loans 17.80% 16.40%
Equipment Financing Agreements    
Financing Receivable Allowance For Credit Losses [Line Items]    
Allowance Amount $ 11,045 $ 10,441
Percentage of Total Allowance 15.60% 15.00%
Total Loans $ 339,599 $ 408,483
Percentage of Total Loans 5.20% 6.10%