Fair Value Measurements - Schedule of Book Value and Estimated Fair Value of Significant Financial Instruments Not Recorded at Fair Value (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Financial Assets:
Debt securities held-to-maturity	$ 1,029,965	$ 1,068,438
Restricted equity investments	85,689	93,766
Financial Liabilities:
Time deposits	2,320,036	2,445,422
Securities sold under agreements to repurchase with customers	66,798	73,148
Level 1 Inputs
Financial Assets:
Cash and due from banks	130,422	153,718
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	66,798	73,148
Level 2 Inputs
Financial Assets:
Cash and due from banks	0	0
Debt securities held-to-maturity	1,029,965	1,068,438
Restricted equity investments	0	0
Loans receivable, net and loans held-for-sale	0	0
Financial Liabilities:
Deposits other than time deposits	7,916,815	7,989,527
Time deposits	2,313,553	2,421,058
FHLB advances and other borrowings	1,068,119	1,008,351
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	0	0
Restricted equity investments	85,689	93,766
Loans receivable, net and loans held-for-sale	9,486,375	9,606,498
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	130,422	153,718
Debt securities held-to-maturity	1,128,666	1,159,735
Restricted equity investments	85,689	93,766
Loans receivable, net and loans held-for-sale	10,072,911	10,141,887
Financial Liabilities:
Deposits other than time deposits	7,916,815	7,989,527
Time deposits	2,320,036	2,445,422
FHLB advances and other borrowings	1,084,158	1,045,092
Securities sold under agreements to repurchase with customers	$ 66,798	$ 73,148