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Fair Value Information - Estimated Fair Value of Financial Instruments (Detail) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Assets    
Cash and cash equivalents $ 240,695 $ 203,461
Investment securities available-for-sale 2,873,163 3,255,211
Investment securities held-to-maturity 2,489,441 2,554,301
Total loans, net of allowance for credit losses 8,788,637 8,994,275
Deposits:    
Interest-bearing 4,772,137 4,671,881
Interest rate swaps 269,552 565,513
Carrying Value [Member]    
Assets    
Cash and cash equivalents 240,695 203,461
Interest-earning balances due from depository institutions 4,108 9,553
Investment securities available-for-sale 2,873,163 3,255,211
Investment securities held-to-maturity 2,489,441 2,554,301
Total loans, net of allowance for credit losses 8,788,637 8,994,275
Interest rate swaps 0 82
Deposits:    
Interest-bearing 4,772,137 4,671,881
Borrowings 1,389,552 1,560,431
Junior subordinated debentures 0 0
Interest rate swaps 0 82
Carrying Value [Member] | Designated As Hedging Instrument [Member]    
Assets    
Interest rate swaps 24,868  
Estimated Fair Value [Member]    
Assets    
Cash and cash equivalents 240,695 203,461
Interest-earning balances due from depository institutions 4,108 9,553
Investment securities available-for-sale 2,873,163 3,255,211
Investment securities held-to-maturity 1,969,318 2,155,587
Total loans, net of allowance for credit losses 7,961,394 8,074,952
Interest rate swaps 0 82
Deposits:    
Interest-bearing 4,766,447 4,664,657
Borrowings 1,322,699 1,444,659
Junior subordinated debentures 0 0
Interest rate swaps 0 82
Estimated Fair Value [Member] | Designated As Hedging Instrument [Member]    
Assets    
Interest rate swaps 24,868  
Estimated Fair Value [Member] | Level 1 [Member]    
Assets    
Cash and cash equivalents 240,695 203,461
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 credit losses 0 0
Interest rate swaps 0 0
Deposits:    
Interest-bearing 0 0
Borrowings 0 0
Junior subordinated debentures 0 0
Interest rate swaps 0 0
Estimated Fair Value [Member] | Level 1 [Member] | Designated As Hedging Instrument [Member]    
Assets    
Interest rate swaps 0  
Estimated Fair Value [Member] | Level 2 [Member]    
Assets    
Cash and cash equivalents 0 0
Interest-earning balances due from depository institutions 4,108 9,553
Investment securities available-for-sale 2,873,163 3,255,211
Investment securities held-to-maturity 1,969,318 2,155,587
Total loans, net of allowance for credit losses 0 0
Interest rate swaps 0 82
Deposits:    
Interest-bearing 4,766,447 4,664,657
Borrowings 1,322,699 1,444,659
Junior subordinated debentures 0 0
Interest rate swaps 0 82
Estimated Fair Value [Member] | Level 2 [Member] | Designated As Hedging Instrument [Member]    
Assets    
Interest rate swaps 24,868  
Estimated Fair Value [Member] | Level 3 [Member]    
Assets    
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 credit losses 7,961,394 8,074,952
Interest rate swaps 0 0
Deposits:    
Interest-bearing 0 0
Borrowings 0 0
Junior subordinated debentures 0 0
Interest rate swaps 0 $ 0
Estimated Fair Value [Member] | Level 3 [Member] | Designated As Hedging Instrument [Member]    
Assets    
Interest rate swaps $ 0