Loans, Troubled Debt Restructurings Performing and Nonaccrual (Details) - USD ($) $ in Thousands	3 Months Ended
	Sep. 30, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Financing Receivable, Modifications [Line Items]
Performing Restructured Loans		$ 26,041	$ 53,263	$ 74,618
Nonaccrual Restructured Loans		22,494	26,292	23,486
Total consumer
Financing Receivable, Modifications [Line Items]
Carrying Amount Of Loans Sold	$ 33,000
Total consumer | Pass
Financing Receivable, Modifications [Line Items]
Carrying Amount Of Loans Sold	21,000
Total consumer | Nonaccrual
Financing Receivable, Modifications [Line Items]
Carrying Amount Of Loans Sold	12,000
Commercial and industrial
Financing Receivable, Modifications [Line Items]
Performing Restructured Loans		16,678	25,478	30,047
Nonaccrual Restructured Loans		7,376	249	1,776
Commercial real estate - owner occupied
Financing Receivable, Modifications [Line Items]
Performing Restructured Loans		1,676	2,080	3,989
Nonaccrual Restructured Loans		0	0	0
Commercial real estate - investor
Financing Receivable, Modifications [Line Items]
Performing Restructured Loans		293	799	14,389
Nonaccrual Restructured Loans		0	933	0
Real estate construction
Financing Receivable, Modifications [Line Items]
Performing Restructured Loans		298	311	310
Nonaccrual Restructured Loans		179	198	157
Residential mortgage
Financing Receivable, Modifications [Line Items]
Performing Restructured Loans		3,955	16,036	17,068
Nonaccrual Restructured Loans		13,035	22,279	18,991
Carrying Amount Of Loans Sold	18,000
Residential mortgage | Nonaccrual
Financing Receivable, Modifications [Line Items]
Carrying Amount Of Loans Sold	7,000
Home equity
Financing Receivable, Modifications [Line Items]
Performing Restructured Loans		1,896	7,385	7,705
Nonaccrual Restructured Loans		1,904	2,627	2,537
Carrying Amount Of Loans Sold	$ 3,000
Other consumer
Financing Receivable, Modifications [Line Items]
Performing Restructured Loans		1,246	1,174	1,110
Nonaccrual Restructured Loans		$ 1	$ 6	$ 25