Fair Value Measurements - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Financial assets:
Securities available for sale	$ 2,809,647	$ 2,560,818
Derivative instruments	25,018	21,867
Financial liabilities:
Derivative instruments:	18,470	17,650
Recurring
Financial assets:
Derivative instruments	43,578	47,098
Mortgage loans held for sale in loans held for sale	230,980	265,959
Total financial assets	3,084,205	2,873,875
Financial liabilities:
Derivative instruments:	35,553	41,484
Recurring | Securities available for sale
Financial assets:
Securities available for sale	2,809,647	2,560,818
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	0	0
Recurring | Level 2
Financial assets:
Derivative instruments	43,578	47,098
Mortgage loans held for sale in loans held for sale	230,980	265,959
Total financial assets	3,084,205	2,873,875
Financial liabilities:
Derivative instruments:	35,553	41,484
Recurring | Level 2 | Securities available for sale
Financial assets:
Securities available for sale	2,809,647	2,560,818
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	$ 0	$ 0