Mortgage Servicing Rights - Changes in Mortgage Servicing Rights (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Servicing Asset at Fair Value, Amount [Roll Forward]
Carrying value at beginning of period	$ 115,512	$ 79,997	$ 75,521
Capitalization	20,809	39,018	47,025
Mortgage servicing rights acquired from Franklin, at fair value	0	0	5,111
Change in fair value:
Due to pay-offs/pay-downs	(16,012)	(30,583)	(27,834)
Due to change in valuation inputs or assumptions	48,056	27,080	(19,826)
Carrying value at end of period	$ 168,365	$ 115,512	$ 79,997