Past Due Loans, Allowance For Credit Losses, Impaired Loans, and TDRS - TDR Rollforward (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Troubled Debt Restructuring Activity Rollforward [Roll Forward]
Beginning balance			$ 8,478
Ending balance	$ 9,282	$ 9,998	9,282	$ 9,998
Material commitments to lend additional funds to borrowers with TDRs	1,900		1,900		$ 3,800
Accruing
Troubled Debt Restructuring Activity Rollforward [Roll Forward]
Beginning balance	1,844	1,778	1,866	1,796
Additions	0	0	12	0
Net payments	(20)	(18)	(54)	(36)
Net transfers to non-accrual	(383)	0	(383)	0
Ending balance	1,441	1,760	1,441	1,760
Non-accrual
Troubled Debt Restructuring Activity Rollforward [Roll Forward]
Beginning balance	9,375	20,466	6,612	24,533
Additions	0	0	0	355
Net payments	(1,447)	(9,865)	1,474	(12,978)
Charge-offs	(470)	(2,363)	(628)	(3,672)
Net transfers from accruing	383	0	383	0
Ending balance	$ 7,841	$ 8,238	$ 7,841	$ 8,238