Fair Value Measurements - Fair Value, Assets and Liabilities Measured on Recurring Basis (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Mortgage servicing rights	$ 47,392	$ 29,144	$ 29,003	$ 26,188
Derivative financial instruments - assets	10,815	18,332
Derivative financial instruments - liabilities	(14,408)	(30,891)
Fair Value, Recurring
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Available-for-sale securities	572,501	468,586
Loans held-for-sale	103,939	193,963
Mortgage servicing rights	47,392	29,144
Derivative financial instruments - assets	10,815	18,332
Derivative financial instruments - liabilities	(14,525)	(30,792)
Total	720,122	679,233
Fair Value, Recurring | Fair Value, Inputs, Level 1
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Available-for-sale securities	35,185	0
Loans held-for-sale	0	0
Mortgage servicing rights	0	0
Derivative financial instruments - assets	0	0
Derivative financial instruments - liabilities	0	0
Total	35,185	0
Fair Value, Recurring | Fair Value, Inputs, Level 2
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Available-for-sale securities	537,316	468,586
Loans held-for-sale	103,939	193,963
Mortgage servicing rights	0	0
Derivative financial instruments - assets	10,815	18,332
Derivative financial instruments - liabilities	(14,525)	(30,792)
Total	637,545	650,089
Fair Value, Recurring | Fair Value, Inputs, 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	47,392	29,144
Derivative financial instruments - assets	0	0
Derivative financial instruments - liabilities	0	0
Total	$ 47,392	$ 29,144