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Fair Value Information - Estimated Fair Value of Financial Instruments (Detail) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Assets        
Total cash and cash equivalents $ 1,732,548 $ 1,958,160 $ 185,518 $ 163,948
Investment securities available-for-sale 3,183,923 2,398,923    
Investment securities held-to-maturity 1,925,970 578,626    
Total loans, net of allowance for loan losses 7,822,694 8,255,116    
Derivative Asset 14,163 30,181    
Deposits:        
Interest-bearing 4,872,386 4,281,114    
Junior subordinated debentures 0 25,774    
Financial liabilities, Net Amounts Presented in the Consolidated Balance Sheets 656,551 469,587    
Carrying Value [Member]        
Assets        
Total cash and cash equivalents 1,732,548 1,958,160    
Interest-earning balances due from depository institutions 25,999 43,563    
Investment securities available-for-sale 3,183,923 2,398,923    
Investment securities held-to-maturity 1,925,970 578,626    
Total loans, net of allowance for loan losses 7,822,694 8,255,116    
Derivative Asset 14,163 30,181    
Deposits:        
Interest-bearing 4,872,386 4,281,114    
Borrowings 644,669 444,406    
Junior subordinated debentures 0 25,774    
Financial liabilities, Net Amounts Presented in the Consolidated Balance Sheets 14,163 30,181    
Estimated Fair Value [Member]        
Assets        
Total cash and cash equivalents 1,732,548 1,958,160    
Interest-earning balances due from depository institutions 25,999 43,600    
Investment securities available-for-sale 3,183,923 2,398,923    
Investment securities held-to-maturity 1,921,693 604,223    
Total loans, net of allowance for loan losses 7,696,210 8,256,178    
Derivative Asset 14,163 30,181    
Deposits:        
Interest-bearing 4,871,531 4,281,952    
Borrowings 586,645 444,349    
Junior subordinated debentures 0 19,431    
Financial liabilities, Net Amounts Presented in the Consolidated Balance Sheets 14,163 30,181    
Estimated Fair Value [Member] | Level 1 [Member]        
Assets        
Total cash and cash equivalents 1,732,548 1,958,160    
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    
Derivative Asset 0 0    
Deposits:        
Interest-bearing 0 0    
Borrowings 0 0    
Junior subordinated debentures 0 0    
Financial liabilities, Net Amounts Presented in the 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 25,999 43,600    
Investment securities available-for-sale 3,183,923 2,398,923    
Investment securities held-to-maturity 1,921,693 604,223    
Total loans, net of allowance for loan losses 0 0    
Derivative Asset 14,163 30,181    
Deposits:        
Interest-bearing 4,871,531 4,281,952    
Borrowings 586,645 444,349    
Junior subordinated debentures 0 0    
Financial liabilities, Net Amounts Presented in the Consolidated Balance Sheets 14,163 30,181    
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 7,696,210 8,256,178    
Derivative Asset 0 0    
Deposits:        
Interest-bearing 0 0    
Borrowings 0 0    
Junior subordinated debentures 0 19,431    
Financial liabilities, Net Amounts Presented in the Consolidated Balance Sheets $ 0 $ 0