Fair Value Measurements - Book Value and Estimated Fair Value of Bank's Significant Financial Instruments Not Recorded at Fair Value (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Financial Assets:
Debt securities held-to-maturity	$ 1,110,041	$ 1,152,744
Restricted equity investments	109,278	53,195
Financial Liabilities:
Time deposits	1,542,020	775,001
Securities sold under agreements to repurchase with customers	69,097	118,769
Level 1 Inputs
Financial Assets:
Cash and due from banks	167,946	204,949
Debt securities held-to-maturity	0	0
Restricted equity investments	0	0
Loans receivable, net and loans held-for-sale	0	0
Financial Liabilities:
Deposits other than time deposits	0	0
Time deposits	0	0
FHLB advances and other borrowings	0	0
Securities sold under agreements to repurchase with customers	69,097	118,769
Level 2 Inputs
Financial Assets:
Cash and due from banks	0	0
Debt securities held-to-maturity	1,097,984	1,138,529
Restricted equity investments	0	0
Loans receivable, net and loans held-for-sale	0	0
Financial Liabilities:
Deposits other than time deposits	8,133,186	8,957,815
Time deposits	1,504,601	773,766
FHLB advances and other borrowings	1,416,384	251,491
Securities sold under agreements to repurchase with customers	0	0
Level 3 Inputs
Financial Assets:
Cash and due from banks	0	0
Debt securities held-to-maturity	12,057	14,215
Restricted equity investments	109,278	53,195
Loans receivable, net and loans held-for-sale	9,103,137	8,533,506
Financial Liabilities:
Deposits other than time deposits	0	0
Time deposits	0	0
FHLB advances and other borrowings	0	0
Securities sold under agreements to repurchase with customers	0	0
Book Value
Financial Assets:
Cash and due from banks	167,946	204,949
Debt securities held-to-maturity	1,221,138	1,139,193
Restricted equity investments	109,278	53,195
Loans receivable, net and loans held-for-sale	9,869,408	8,583,352
Financial Liabilities:
Deposits other than time deposits	8,133,186	8,957,815
Time deposits	1,542,020	775,001
FHLB advances and other borrowings	1,406,569	229,141
Securities sold under agreements to repurchase with customers	$ 69,097	$ 118,769