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Fair Value Information - Estimated Fair Value of Financial Instruments (Detail) - USD ($)
$ in Thousands
Jun. 30, 2023
Dec. 31, 2022
Assets    
Total cash and cash equivalents $ 618,355 $ 203,461
Investment securities available-for-sale 3,068,151 3,255,211
Investment securities held-to-maturity 2,512,707 2,554,301
Total loans, net of allowance for loan losses 8,820,430 8,994,275
Deposits:    
Interest-bearing 4,518,711 4,671,881
Swaps 452,444 565,513
Carrying Value [Member]    
Assets    
Total cash and cash equivalents 618,355 203,461
Interest-earning balances due from depository institutions 30,478 9,553
Investment securities available-for-sale 3,068,151 3,255,211
Investment securities held-to-maturity 2,512,707 2,554,301
Total loans, net of allowance for loan losses 8,820,430 8,994,275
Interest rate swaps, assets 71 82
Deposits:    
Interest-bearing 4,518,711 4,671,881
Borrowings 1,947,373 1,560,431
Junior subordinated debentures 0 0
Swaps 71 82
Carrying Value [Member] | Derivatives designated as hedging instruments [Member]    
Assets    
Interest rate swaps, assets 11,129  
Estimated Fair Value [Member]    
Assets    
Total cash and cash equivalents 618,355 203,461
Interest-earning balances due from depository institutions 30,478 9,553
Investment securities available-for-sale 3,068,151 3,255,211
Investment securities held-to-maturity 2,108,653 2,155,587
Total loans, net of allowance for loan losses 8,057,666 8,074,952
Interest rate swaps, assets 71 82
Deposits:    
Interest-bearing 4,512,855 4,664,657
Borrowings 1,849,015 1,444,659
Junior subordinated debentures 0 0
Swaps 71 82
Estimated Fair Value [Member] | Level 1 [Member]    
Assets    
Total cash and cash equivalents 618,355 203,461
Interest-earning balances due from depository institutions 0 0
Investment securities available-for-sale 0 0
Investment securities held-to-maturity 0 0
Total loans, net of allowance for loan losses 0 0
Interest rate swaps, assets 0 0
Deposits:    
Interest-bearing 0 0
Borrowings 0 0
Junior subordinated debentures 0 0
Swaps 0 0
Estimated Fair Value [Member] | Level 2 [Member]    
Assets    
Total cash and cash equivalents 0 0
Interest-earning balances due from depository institutions 30,478 9,553
Investment securities available-for-sale 3,068,151 3,255,211
Investment securities held-to-maturity 2,108,653 2,155,587
Total loans, net of allowance for loan losses 0 0
Interest rate swaps, assets 71 82
Deposits:    
Interest-bearing 4,512,855 4,664,657
Borrowings 1,849,015 1,444,659
Junior subordinated debentures 0 0
Swaps 71 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
Investment securities available-for-sale 0 0
Investment securities held-to-maturity 0 0
Total loans, net of allowance for loan losses 8,057,666 8,074,952
Interest rate swaps, assets 0 0
Deposits:    
Interest-bearing 0 0
Borrowings 0 0
Junior subordinated debentures 0 0
Swaps 0 $ 0
Estimated Fair Value [Member] | Derivatives designated as hedging instruments [Member]    
Assets    
Interest rate swaps, assets 11,129  
Estimated Fair Value [Member] | Derivatives designated as hedging instruments [Member] | Level 1 [Member]    
Assets    
Interest rate swaps, assets 0  
Estimated Fair Value [Member] | Derivatives designated as hedging instruments [Member] | Level 2 [Member]    
Assets    
Interest rate swaps, assets 11,129  
Estimated Fair Value [Member] | Derivatives designated as hedging instruments [Member] | Level 3 [Member]    
Assets    
Interest rate swaps, assets $ 0