Fair Value Measurements - Fair Value, Assets and Liabilities Measured on Recurring Basis (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Mortgage servicing rights	$ 78,390	$ 73,424	$ 74,097	$ 66,047	$ 60,481	$ 47,392
Fair Value, Recurring
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Available-for-sale securities	515,956		536,973
Loans held-for-sale	56,350		57,323
Mortgage servicing rights	78,390		74,097
Derivative financial instruments - assets	41,195		40,287
Derivative financial instruments - liabilities	(24,842)		(24,527)
Total	667,049		684,153
Fair Value, Recurring | Level 1
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Available-for-sale securities	56,869		56,649
Loans held-for-sale	0		0
Mortgage servicing rights	0		0
Derivative financial instruments - assets	0		0
Derivative financial instruments - liabilities	0		0
Total	56,869		56,649
Fair Value, Recurring | Level 2
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Available-for-sale securities	459,087		480,324
Loans held-for-sale	56,350		57,323
Mortgage servicing rights	0		0
Derivative financial instruments - assets	41,195		40,287
Derivative financial instruments - liabilities	(24,842)		(24,527)
Total	531,790		553,407
Fair Value, Recurring | Level 3
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Available-for-sale securities	0		0
Loans held-for-sale	0		0
Mortgage servicing rights	78,390		74,097
Derivative financial instruments - assets	0		0
Derivative financial instruments - liabilities	0		0
Total	$ 78,390		$ 74,097