Servicing Rights - Mortgage Servicing Assets (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Servicing Asset at Fair Value, Amount [Roll Forward]
Balance, beginning of period			$ 10,821
Additions for new MSR capitalized			2,672	$ 2,662
Changes in fair value:
Balance, end of period	$ 11,206		11,206
Balance of mortgage loans serviced for others	$ 634,059		$ 634,059		$ 557,583
MSR as a percentage of serviced loans	1.77%		1.77%		1.94%
Mortgage servicing rights
Servicing Asset at Fair Value, Amount [Roll Forward]
Balance, beginning of period	$ 10,836	$ 8,733	$ 10,821	7,305
Additions for new MSR capitalized	1,033	1,090	2,672	2,662
Changes in fair value:
Due to changes in model inputs of assumptions	(378)	125	(1,385)	490
Other	(285)	(253)	(902)	(762)
Balance, end of period	11,206	$ 9,695	11,206	$ 9,695
Balance of mortgage loans serviced for others	$ 634,059		$ 634,059		$ 557,583
MSR as a percentage of serviced loans	1.77%		1.77%		1.94%