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Fair Value Measurements - Carrying Value and Fair Value of Financial Instruments (Details) - USD ($)
$ in Thousands
Sep. 30, 2022
Dec. 31, 2021
Financial Assets:    
Investment securities held to maturity $ 677,335 $ 376,331
Financial Liabilities:    
Investment securities held to maturity, at amortized cost, net (fair value of $677,335 and $376,331, respectively) 773,319 383,393
Total investment securities available for sale 1,356,142 894,335
Interest rate swap    
Financial Liabilities:    
Derivative liabilities - interest rate swaps   15,286
Level 1    
Financial Assets:    
Investment securities available for sale 19,770  
Level 3    
Financial Assets:    
Investment securities available for sale 0  
Carrying Value    
Financial Assets:    
Cash and cash equivalents 407,324 1,723,292
Investment securities available for sale 1,356,142 894,335
Investment securities held to maturity 773,319 383,393
Loans held for sale 0 1,476
Loans receivable, net 3,959,206 3,773,301
Accrued interest receivable 17,812 14,657
Equity security 192 240
Financial Liabilities:    
Non-maturity deposits   6,051,451
Certificates of deposit   342,839
Securities sold under agreement to repurchase 40,449 50,839
Junior subordinated debentures 21,399 21,180
Accrued interest payable 101 73
Carrying Value | Interest rate swap    
Financial Assets:    
Derivative assets - interest rate swaps 32,523 15,219
Financial Liabilities:    
Derivative liabilities - interest rate swaps 32,523 15,286
Carrying Value | Noninterest deposits, interest bearing demand deposits, money market accounts and savings accounts    
Financial Liabilities:    
Non-maturity deposits 5,950,312  
Carrying Value | Bank Time Deposits    
Financial Liabilities:    
Certificates of deposit 287,423  
Fair Value    
Financial Assets:    
Cash and cash equivalents 407,324 1,723,292
Investment securities available for sale 1,356,142 894,335
Investment securities held to maturity 677,335 376,331
Loans held for sale 0 1,527
Loans receivable, net 3,848,546 3,849,602
Accrued interest receivable 17,812 14,657
Equity security 192 240
Financial Liabilities:    
Non-maturity deposits   6,051,451
Certificates of deposit   344,025
Securities sold under agreement to repurchase 40,449 50,839
Junior subordinated debentures 20,250 18,750
Accrued interest payable 101 73
Fair Value | Interest rate swap    
Financial Assets:    
Derivative assets - interest rate swaps 32,523 15,219
Financial Liabilities:    
Derivative liabilities - interest rate swaps 32,523 15,286
Fair Value | Noninterest deposits, interest bearing demand deposits, money market accounts and savings accounts    
Financial Liabilities:    
Non-maturity deposits 5,950,312  
Fair Value | Bank Time Deposits    
Financial Liabilities:    
Certificates of deposit 287,837  
Fair Value | Level 1    
Financial Assets:    
Cash and cash equivalents 407,324 1,723,292
Investment securities available for sale   0
Investment securities held to maturity 0 0
Loans held for sale 0 0
Loans receivable, net 0 0
Accrued interest receivable 351 14
Equity security 192 240
Financial Liabilities:    
Non-maturity deposits   6,051,451
Certificates of deposit   0
Securities sold under agreement to repurchase 40,449 50,839
Junior subordinated debentures 0 0
Accrued interest payable 36 33
Fair Value | Level 1 | Interest rate swap    
Financial Assets:    
Derivative assets - interest rate swaps 0 0
Financial Liabilities:    
Derivative liabilities - interest rate swaps 0 0
Fair Value | Level 1 | Noninterest deposits, interest bearing demand deposits, money market accounts and savings accounts    
Financial Liabilities:    
Non-maturity deposits 5,950,312  
Fair Value | Level 1 | Bank Time Deposits    
Financial Liabilities:    
Certificates of deposit 0  
Fair Value | Level 2    
Financial Assets:    
Cash and cash equivalents 0 0
Investment securities available for sale 1,336,372 894,335
Investment securities held to maturity 677,335 376,331
Loans held for sale 0 1,527
Loans receivable, net 0 0
Accrued interest receivable 6,962 4,582
Derivative assets - interest rate swaps 32,523 15,219
Equity security 0 0
Financial Liabilities:    
Non-maturity deposits   0
Certificates of deposit   344,025
Securities sold under agreement to repurchase 0 0
Junior subordinated debentures 0 0
Accrued interest payable 13 19
Derivative liabilities - interest rate swaps 32,523 15,286
Fair Value | Level 2 | Interest rate swap    
Financial Assets:    
Derivative assets - interest rate swaps 32,523 15,219
Financial Liabilities:    
Derivative liabilities - interest rate swaps 32,523  
Fair Value | Level 2 | Noninterest deposits, interest bearing demand deposits, money market accounts and savings accounts    
Financial Liabilities:    
Non-maturity deposits 0  
Fair Value | Level 2 | Bank Time Deposits    
Financial Liabilities:    
Certificates of deposit 287,837  
Fair Value | Level 3    
Financial Assets:    
Cash and cash equivalents 0 0
Investment securities available for sale   0
Investment securities held to maturity 0 0
Loans held for sale 0 0
Loans receivable, net 3,848,546 3,849,602
Accrued interest receivable 10,499 10,061
Equity security 0 0
Financial Liabilities:    
Non-maturity deposits   0
Certificates of deposit   0
Securities sold under agreement to repurchase 0 0
Junior subordinated debentures 20,250 18,750
Accrued interest payable 52 21
Fair Value | Level 3 | Interest rate swap    
Financial Assets:    
Derivative assets - interest rate swaps 0 0
Financial Liabilities:    
Derivative liabilities - interest rate swaps 0 $ 0
Fair Value | Level 3 | Noninterest deposits, interest bearing demand deposits, money market accounts and savings accounts    
Financial Liabilities:    
Non-maturity deposits 0  
Fair Value | Level 3 | Bank Time Deposits    
Financial Liabilities:    
Certificates of deposit $ 0