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Fair Values of Assets and Liabilities - Carrying Amounts and Fair Values of Financial Instruments (Detail) - USD ($)
$ in Thousands
Sep. 30, 2024
Dec. 31, 2023
Carrying Amount [Member]    
Fair Value Measurements Of Financial Instruments [Line Items]    
Cash and due from banks $ 126,598 $ 125,436
Interest-bearing deposits 455,711 21,557
Debt Securities, Available-for-Sale 1,140,800 1,020,986
Equity securities, at fair market value 0  
Debt Securities, Held-to-maturity 430,425 419,009
Other investments 24,592 50,871
Loans Held for sale, Amount 46,785 29,820
Loans and Leases Receivable, Net of Deferred Income 8,965,500 8,968,761
Deposits 9,745,552 9,192,309
Short-term borrowings 538,828 597,835
Subordinated debt 128,266 177,741
Long-term debt 3,548 4,122
Capital Lease Obligations 4,471 4,894
Estimate of Fair Value Measurement [Member]    
Fair Value Measurements Of Financial Instruments [Line Items]    
Cash and due from banks 126,598 125,436
Interest-bearing deposits 455,711 21,557
Debt Securities, Available-for-Sale 1,140,800 1,020,986
Equity securities, at fair market value 0  
Debt Securities, Held-to-maturity 373,160 350,595
Other investments 24,592 50,871
Loans Held for sale, Amount 46,785 29,820
Loans and Leases Receivable, Net of Deferred Income 8,903,333 8,860,736
Deposits 9,745,094 9,187,655
Short-term borrowings 537,568 594,670
Subordinated debt 111,785 151,525
Long-term debt 3,539 4,041
Capital Lease Obligations 4,471 4,894
Estimate of Fair Value Measurement [Member] | Level 1 [Member]    
Fair Value Measurements Of Financial Instruments [Line Items]    
Cash and due from banks 126,598 125,436
Interest-bearing deposits 455,711 21,557
Debt Securities, Available-for-Sale 0 0
Equity securities, at fair market value 0  
Debt Securities, Held-to-maturity 0 0
Other investments 0 0
Loans Held for sale, Amount 0 0
Loans and Leases Receivable, Net of Deferred Income 0 0
Deposits 0 0
Short-term borrowings 0 0
Subordinated debt 0 0
Long-term debt 0 0
Capital Lease Obligations 0 0
Estimate of Fair Value Measurement [Member] | Level 2 [Member]    
Fair Value Measurements Of Financial Instruments [Line Items]    
Cash and due from banks 0 0
Interest-bearing deposits 0 0
Debt Securities, Available-for-Sale 1,140,800 1,020,986
Equity securities, at fair market value 0  
Debt Securities, Held-to-maturity 373,160 350,595
Other investments 18,860 44,689
Loans Held for sale, Amount 46,785 29,820
Loans and Leases Receivable, Net of Deferred Income 49,501 25,215
Deposits 9,745,094 9,187,655
Short-term borrowings 537,568 594,670
Subordinated debt 0 0
Long-term debt 3,539 4,041
Capital Lease Obligations 4,471 4,894
Estimate of Fair Value Measurement [Member] | Level 3 [Member]    
Fair Value Measurements Of Financial Instruments [Line Items]    
Cash and due from banks 0 0
Interest-bearing deposits 0 0
Debt Securities, Available-for-Sale 0 0
Equity securities, at fair market value 0  
Debt Securities, Held-to-maturity 0 0
Other investments 5,732 6,182
Loans Held for sale, Amount 0 0
Loans and Leases Receivable, Net of Deferred Income 8,853,832 8,835,521
Deposits 0 0
Short-term borrowings 0 0
Subordinated debt 111,785 151,525
Long-term debt 0 0
Capital Lease Obligations 0 0
Cash and due from banks 126,598 125,436
Interest-bearing deposits 455,711 21,557
Debt Securities, Available-for-Sale 1,140,800 1,020,986
Equity securities, at fair market value 0  
Debt Securities, Held-to-maturity 430,425 419,009
Other investments 24,592 50,871
Loans and Leases Receivable, Net of Deferred Income 8,965,500 8,968,761
Deposits 9,745,552 9,192,309
Short-term borrowings 538,828 597,835
Subordinated debt 128,266 177,741
Long-term debt 3,548 4,122
Capital Lease Obligations 4,471 4,894
Level 1 [Member]    
Fair Value Measurements Of Financial Instruments [Line Items]    
Equity securities, at fair market value 0  
Other investments 0 0
Level 2 [Member]    
Fair Value Measurements Of Financial Instruments [Line Items]    
Equity securities, at fair market value 0  
Other investments 18,860 44,689
Level 3 [Member]    
Fair Value Measurements Of Financial Instruments [Line Items]    
Equity securities, at fair market value 0  
Other investments $ 5,732 $ 6,182