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Fair Value Information - Estimated Fair Value of Financial Instruments (Detail) - USD ($)
$ in Thousands
Mar. 31, 2023
Dec. 31, 2022
Assets    
Total cash and cash equivalents $ 227,534 $ 203,461
Fair Value, Available-for-sale 3,204,524 3,255,211
Investment securities held-to-maturity 2,535,979 2,554,301
Total loans, net of allowance for loan losses 8,855,949 8,994,275
Deposits:    
Interest-bearing 4,427,541 4,671,881
Financial liabilities, Net Amounts Presented in the Condensed Consolidated Balance Sheets 490,370 565,513
Carrying Value [Member]    
Assets    
Total cash and cash equivalents 227,534 203,461
Interest-earning balances due from depository institutions 11,944 9,553
Fair Value, Available-for-sale 3,204,524 3,255,211
Investment securities held-to-maturity 2,535,979 2,554,301
Total loans, net of allowance for loan losses 8,855,949 8,994,275
Financial assets, Net Amounts Presented in the Condensed Consolidated Balance Sheets 135 82
Deposits:    
Interest-bearing 4,427,541 4,671,881
Borrowings 1,895,235 1,560,431
Junior subordinated debentures
Financial liabilities, Net Amounts Presented in the Condensed Consolidated Balance Sheets 135 82
Estimated Fair Value [Member]    
Assets    
Total cash and cash equivalents 227,534 203,461
Interest-earning balances due from depository institutions 11,944 9,553
Fair Value, Available-for-sale 3,204,524 3,255,211
Investment securities held-to-maturity 2,168,569 2,155,587
Total loans, net of allowance for loan losses 8,022,018 8,074,952
Financial assets, Net Amounts Presented in the Condensed Consolidated Balance Sheets 135 82
Deposits:    
Interest-bearing 4,421,511 4,664,657
Borrowings 1,797,500 1,444,659
Junior subordinated debentures 0 0
Financial liabilities, Net Amounts Presented in the Condensed Consolidated Balance Sheets 135 82
Estimated Fair Value [Member] | Level 1 [Member]    
Assets    
Total cash and cash equivalents 227,534 203,461
Interest-earning balances due from depository institutions 0 0
Fair Value, Available-for-sale 0 0
Investment securities held-to-maturity 0 0
Total loans, net of allowance for loan losses 0 0
Financial assets, Net Amounts Presented in the Condensed Consolidated Balance Sheets 0 0
Deposits:    
Interest-bearing 0 0
Borrowings 0 0
Junior subordinated debentures 0 0
Financial liabilities, Net Amounts Presented in the Condensed Consolidated Balance Sheets 0 0
Estimated Fair Value [Member] | Level 2 [Member]    
Assets    
Total cash and cash equivalents 0 0
Interest-earning balances due from depository institutions 11,944 9,553
Fair Value, Available-for-sale 3,204,524 3,255,211
Investment securities held-to-maturity 2,168,569 2,155,587
Total loans, net of allowance for loan losses 0 0
Financial assets, Net Amounts Presented in the Condensed Consolidated Balance Sheets 135 82
Deposits:    
Interest-bearing 4,421,511 4,664,657
Borrowings 1,797,500 1,444,659
Junior subordinated debentures 0 0
Financial liabilities, Net Amounts Presented in the Condensed Consolidated Balance Sheets 135 82
Estimated Fair Value [Member] | Level 3 [Member]    
Assets    
Total cash and cash equivalents 0 0
Interest-earning balances due from depository institutions 0 0
Fair Value, Available-for-sale 0 0
Investment securities held-to-maturity 0 0
Total loans, net of allowance for loan losses 8,022,018 8,074,952
Financial assets, Net Amounts Presented in the Condensed Consolidated Balance Sheets 0 0
Deposits:    
Interest-bearing 0 0
Borrowings 0 0
Junior subordinated debentures 0 0
Financial liabilities, Net Amounts Presented in the Condensed Consolidated Balance Sheets $ 0 $ 0