Fair Value Measurements - Carrying Value and Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021	Jun. 30, 2021
Financial Assets:
Investment securities held to maturity	$ 559,312	$ 376,331
Financial Liabilities:
Investment securities held to maturity, at amortized cost, net (fair value of $559,312 and $376,331, respectively)	615,653	383,393
Total investment securities available for sale	1,187,588	894,335
Fair Value, Recurring [Member]
Financial Assets:
Equity security	186	240
Financial Liabilities:
Total investment securities available for sale	1,187,588	894,335
Fair Value, Recurring [Member] | Interest rate swap
Financial Assets:
Derivative assets - interest rate swaps	19,842	15,219
Financial Liabilities:
Derivative liabilities - interest rate swaps	19,842	15,286
Level 1 | Fair Value, Recurring [Member]
Financial Assets:
Equity security	186	240
Financial Liabilities:
Total investment securities available for sale	19,939	0
Level 1 | Fair Value, Recurring [Member] | Interest rate swap
Financial Assets:
Derivative assets - interest rate swaps	0	0
Financial Liabilities:
Derivative liabilities - interest rate swaps	0	0
Level 2 | Fair Value, Recurring [Member]
Financial Assets:
Investment securities held to maturity	559,312	376,331
Equity security	0	0
Financial Liabilities:
Investment securities held to maturity, at amortized cost, net (fair value of $559,312 and $376,331, respectively)	615,653	383,393
Total investment securities available for sale	1,167,649	894,335
Level 2 | Fair Value, Recurring [Member] | Interest rate swap
Financial Assets:
Derivative assets - interest rate swaps	19,842
Financial Liabilities:
Derivative liabilities - interest rate swaps	19,842
Level 3 | Fair Value, Recurring [Member]
Financial Assets:
Equity security	0	0
Financial Liabilities:
Total investment securities available for sale	0	0
Level 3 | Fair Value, Recurring [Member] | Interest rate swap
Financial Assets:
Derivative assets - interest rate swaps	0	0
Financial Liabilities:
Derivative liabilities - interest rate swaps	0	0
Carrying Value
Financial Assets:
Cash and cash equivalents	994,055	1,723,292
Loans receivable, net	3,834,368	3,773,301
Accrued interest receivable	15,908	14,657
Derivative assets - interest rate swaps	19,842	15,219
Equity security	186	240
Financial Liabilities:
Non-maturity deposits		6,038,498
Certificates of deposit		342,839
Securities sold under agreement to repurchase	41,827	50,839
Junior subordinated debentures	21,326	21,180
Accrued interest payable	83	73
Derivative liabilities - interest rate swaps	19,842	15,286
Investment securities held to maturity, at amortized cost, net (fair value of $559,312 and $376,331, respectively)	615,653	383,393
Total investment securities available for sale	1,187,588
Carrying Value | Noninterest deposits, interest bearing demand deposits, money market accounts and savings accounts
Financial Liabilities:
Non-maturity deposits	6,019,421
Carrying Value | Bank Time Deposits
Financial Liabilities:
Certificates of deposit	310,769
Fair Value
Financial Assets:
Cash and cash equivalents	994,055	1,723,292
Investment securities available for sale		894,335
Investment securities held to maturity	559,312	376,331
Loans held for sale	1,353	1,527
Loans receivable, net	3,760,294	3,849,602
Accrued interest receivable	15,908	14,657
Derivative assets - interest rate swaps	19,842	15,219
Equity security	186	240
Financial Liabilities:
Non-maturity deposits		6,038,498
Certificates of deposit		344,025
Securities sold under agreement to repurchase	41,827	50,839
Junior subordinated debentures	19,250	18,750
Accrued interest payable	83	73
Derivative liabilities - interest rate swaps	19,842	15,286
Total investment securities available for sale	1,187,588
Fair Value | Noninterest deposits, interest bearing demand deposits, money market accounts and savings accounts
Financial Liabilities:
Non-maturity deposits	6,019,421
Fair Value | Bank Time Deposits
Financial Liabilities:
Certificates of deposit	311,481
Fair Value | Level 1
Financial Assets:
Cash and cash equivalents	994,055	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	272	14
Derivative assets - interest rate swaps	0	0
Equity security		240
Financial Liabilities:
Non-maturity deposits		6,038,498
Certificates of deposit		0
Securities sold under agreement to repurchase	41,827	50,839
Junior subordinated debentures	0	0
Accrued interest payable	31	33
Derivative liabilities - interest rate swaps	0	0
Fair Value | Level 1 | Fair Value, Recurring [Member]
Financial Assets:
Equity security	186
Fair Value | Level 1 | Noninterest deposits, interest bearing demand deposits, money market accounts and savings accounts
Financial Liabilities:
Non-maturity deposits	6,019,421
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		894,335
Investment securities held to maturity	559,312	376,331
Loans held for sale	1,353	1,527
Loans receivable, net	0	0
Accrued interest receivable	6,185	4,582
Derivative assets - interest rate swaps	19,842	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	16	19
Derivative liabilities - interest rate swaps	19,842	15,286
Total investment securities available for sale			$ 1,167,649
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	311,481
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	3,760,294	3,849,602
Accrued interest receivable	9,451	10,061
Derivative assets - interest rate swaps	0	0
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	19,250	18,750
Accrued interest payable	36	21
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