Fair Value Measurements - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Financial assets:
Securities available for sale, at fair value	$ 909,108	$ 1,533,942
Derivative instruments	45,807	36,493
Financial liabilities:
Derivative instruments:	28,081	22,056
Recurring
Financial assets:
Derivative instruments	47,719	38,047
Mortgage loans held for sale in loans held for sale	241,613	110,105
Total financial assets	1,198,440	1,682,094
Financial liabilities:
Derivative instruments:	43,469	33,185
Recurring | Securities available for sale
Financial assets:
Securities available for sale, at fair value	909,108	1,533,942
Recurring | Level 1
Financial assets:
Derivative instruments	0	0
Mortgage loans held for sale in loans held for sale	0	0
Total financial assets	0	0
Financial liabilities:
Derivative instruments:	0	0
Recurring | Level 1 | Securities available for sale
Financial assets:
Securities available for sale, at fair value	0	0
Recurring | Level 2
Financial assets:
Derivative instruments	47,719	38,047
Mortgage loans held for sale in loans held for sale	241,613	110,105
Total financial assets	1,198,440	1,682,094
Financial liabilities:
Derivative instruments:	43,469	33,185
Recurring | Level 2 | Securities available for sale
Financial assets:
Securities available for sale, at fair value	909,108	1,533,942
Recurring | Level 3
Financial assets:
Derivative instruments	0	0
Mortgage loans held for sale in loans held for sale	0	0
Total financial assets	0	0
Financial liabilities:
Derivative instruments:	0	0
Recurring | Level 3 | Securities available for sale
Financial assets:
Securities available for sale, at fair value	$ 0	$ 0