Past Due Loans, Allowance For Credit Losses, Non-Accrual Loans, and TDRS - TDR Rollforward (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Troubled Debt Restructuring Activity Rollforward [Roll Forward]
Beginning balance	$ 21,745
Ending balance	19,133	$ 11,219
Material commitments to lend additional funds to borrowers with TDRs	813		$ 530
Accruing
Troubled Debt Restructuring Activity Rollforward [Roll Forward]
Beginning balance	1,233	1,866
Additions	0	12
Net payments	(17)	(34)
Net transfers to non-accrual	0	0
Ending balance	1,216	1,844
Non-accrual
Troubled Debt Restructuring Activity Rollforward [Roll Forward]
Beginning balance	20,514	6,612
Additions	934	0
Net payments	(658)	2,921
Charge-offs	(2,873)	(158)
Net transfers from accruing	0	0
Ending balance	$ 17,917	$ 9,375