Servicing Rights - Mortgage Servicing Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Servicing Asset at Fair Value, Amount [Roll Forward]
Balance, beginning of period	$ 10,821
Additions for new MSR capitalized	3,707	$ 3,641	$ 3,146
Changes in fair value:
Carrying value, December 31	11,920	10,821
Balance of mortgage loans serviced for others	$ 659,048	$ 557,583
MSR as a percentage of serviced loans	1.81%	1.94%
Mortgage servicing rights
Servicing Asset at Fair Value, Amount [Roll Forward]
Balance, beginning of period	$ 10,821	$ 7,305	4,157
Additions for new MSR capitalized	3,707	3,641	3,146
Changes in fair value:
Due to changes in model inputs of assumptions	(1,313)	591	551
Other	(1,295)	(716)	(549)
Carrying value, December 31	11,920	10,821	$ 7,305
Balance of mortgage loans serviced for others	$ 659,048	$ 557,583
MSR as a percentage of serviced loans	1.81%	1.94%