Allowance for Credit Losses - Impaired Loans (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2019	Dec. 31, 2019
Recorded Investment
Impaired loans with no related allowance recorded			$ 14,280
Impaired loans with a related allowance recorded			6,358
Total impaired loans			20,638
Unpaid Principal Balance
Impaired loans with no related allowance recorded			14,589
Impaired loans with a related allowance recorded			6,638
Total impaired loans			21,227
Related Allowance, Impaired loans			203
Average Recorded Investment
Impaired loans with no related allowance recorded	$ 14,999	$ 15,592
Impaired loans with a related allowance recorded	11,987	12,921
Total impaired loans	26,986	28,513
Interest Income Recognized
Impaired loans with no related allowance recorded	164	653
Impaired loans with a related allowance recorded	202	628
Total impaired loans	366	1,281
Commercial and Industrial
Recorded Investment
Impaired loans with no related allowance recorded			3,825
Impaired loans with a related allowance recorded			1,126
Total impaired loans			4,951
Unpaid Principal Balance
Impaired loans with no related allowance recorded			3,841
Impaired loans with a related allowance recorded			1,126
Total impaired loans			4,967
Related Allowance, Impaired loans			46
Average Recorded Investment
Impaired loans with no related allowance recorded	3,888	3,653
Impaired loans with a related allowance recorded	4,673	5,325
Total impaired loans	8,561	8,978
Interest Income Recognized
Impaired loans with no related allowance recorded	38	123
Impaired loans with a related allowance recorded	94	301
Total impaired loans	132	424
Commercial real estate
Recorded Investment
Impaired loans with no related allowance recorded			30
Impaired loans with a related allowance recorded			693
Total impaired loans			723
Unpaid Principal Balance
Impaired loans with no related allowance recorded			30
Impaired loans with a related allowance recorded			693
Total impaired loans			723
Related Allowance, Impaired loans			27
Average Recorded Investment
Impaired loans with no related allowance recorded	2,946	3,524
Impaired loans with a related allowance recorded	706	714
Total impaired loans	3,652	4,238
Interest Income Recognized
Impaired loans with no related allowance recorded	38	250
Impaired loans with a related allowance recorded	10	30
Total impaired loans	48	280
Residential
Recorded Investment
Impaired loans with no related allowance recorded			10,425
Impaired loans with a related allowance recorded			4,539
Total impaired loans			14,964
Unpaid Principal Balance
Impaired loans with no related allowance recorded			10,718
Impaired loans with a related allowance recorded			4,819
Total impaired loans			15,537
Related Allowance, Impaired loans			$ 130
Average Recorded Investment
Impaired loans with no related allowance recorded	8,065	8,365
Impaired loans with a related allowance recorded	6,608	6,882
Total impaired loans	14,673	15,247
Interest Income Recognized
Impaired loans with no related allowance recorded	88	280
Impaired loans with a related allowance recorded	98	297
Total impaired loans	186	577
Consumer
Average Recorded Investment
Impaired loans with no related allowance recorded	100	50
Total impaired loans	$ 100	$ 50