Other Real Estate Owned (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Other Real Estate Owned Rollforward
Balance at beginning of the period	$ 113,940	$ 118,851	$ 122,072	$ 136,705
Write-downs in value	(1,003)	(1,093)	(3,888)	(5,223)
Additions	1,508	17,652	19,877	45,301
Sales	(13,801)	(17,251)	(37,513)	(58,257)
Other adjustments	(52)	(231)	44	(598)
Ending balance	100,592	117,928	100,592	117,928
Mortgages
Other Real Estate Owned Rollforward
Balance at beginning of the period	97,458	100,303	105,113	114,911
Write-downs in value	(843)	(745)	(2,414)	(3,896)
Additions	1,467	16,572	17,716	41,042
Sales	(12,416)	(15,182)	(34,845)	(50,742)
Other adjustments	4	(231)	100	(598)
Ending balance	85,670	100,717	85,670	100,717
Commercial / Construction
Other Real Estate Owned Rollforward
Balance at beginning of the period	16,482	18,548	16,959	21,794
Write-downs in value	(160)	(348)	(1,474)	(1,327)
Additions	41	1,080	2,161	4,259
Sales	(1,385)	(2,069)	(2,668)	(7,515)
Other adjustments	(56)	0	(56)	0
Ending balance	$ 14,922	$ 17,211	$ 14,922	$ 17,211