Loans and Leases and Allowance for Credit Losses - Loans modified under terms of TDR (Details) - Loans receivable $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020 USD ($) contract	Sep. 30, 2019 USD ($) contract	Sep. 30, 2020 USD ($) contract	Sep. 30, 2019 USD ($) contract
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | contract	56	11	214	38
Post-Modification Outstanding Amortized Cost by Type of Modification	$ 6,577	$ 824	$ 13,460	$ 3,037
Modified Within the Previous Twelve Months that Have Subsequently Defaulted, Number of Contracts | contract	9	0	19	2
Modified Within the Previous Twelve Months that Have Subsequently Defaulted, Amortized Cost	$ 290	$ 0	$ 7,234	$ 148
Rate Reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-Modification Outstanding Amortized Cost by Type of Modification	0	0	0	0
Structure
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-Modification Outstanding Amortized Cost by Type of Modification	4,890	702	10,039	2,726
Other
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-Modification Outstanding Amortized Cost by Type of Modification	$ 1,687	$ 122	$ 3,421	$ 311
Indirect auto
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | contract		4		15
Post-Modification Outstanding Amortized Cost by Type of Modification		$ 101		$ 262
Modified Within the Previous Twelve Months that Have Subsequently Defaulted, Number of Contracts | contract		0		0
Modified Within the Previous Twelve Months that Have Subsequently Defaulted, Amortized Cost		$ 0		$ 0
Indirect auto | Rate Reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-Modification Outstanding Amortized Cost by Type of Modification		0		0
Indirect auto | Structure
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-Modification Outstanding Amortized Cost by Type of Modification		0		0
Indirect auto | Other
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-Modification Outstanding Amortized Cost by Type of Modification		$ 101		$ 262
Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | contract	21	2	165	7
Post-Modification Outstanding Amortized Cost by Type of Modification	$ 3,079	$ 93	$ 9,022	$ 899
Modified Within the Previous Twelve Months that Have Subsequently Defaulted, Number of Contracts | contract	9	0	18	0
Modified Within the Previous Twelve Months that Have Subsequently Defaulted, Amortized Cost	$ 290	$ 0	$ 7,231	$ 0
Commercial | Rate Reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-Modification Outstanding Amortized Cost by Type of Modification	0	0	0	0
Commercial | Structure
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-Modification Outstanding Amortized Cost by Type of Modification	1,392	93	5,619	892
Commercial | Other
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-Modification Outstanding Amortized Cost by Type of Modification	$ 1,687	$ 0	$ 3,403	$ 7
Commercial | Owner occupied commercial real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | contract	4	0	7	2
Post-Modification Outstanding Amortized Cost by Type of Modification	$ 375	$ 0	$ 1,911	$ 610
Modified Within the Previous Twelve Months that Have Subsequently Defaulted, Number of Contracts | contract	0	0	0	0
Modified Within the Previous Twelve Months that Have Subsequently Defaulted, Amortized Cost	$ 0	$ 0	$ 0	$ 0
Commercial | Owner occupied commercial real estate | Rate Reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-Modification Outstanding Amortized Cost by Type of Modification	0	0	0	0
Commercial | Owner occupied commercial real estate | Structure
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-Modification Outstanding Amortized Cost by Type of Modification	375	0	375	610
Commercial | Owner occupied commercial real estate | Other
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-Modification Outstanding Amortized Cost by Type of Modification	$ 0	$ 0	$ 1,536	$ 0
Commercial | Income producing commercial real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | contract	2	0	5	1
Post-Modification Outstanding Amortized Cost by Type of Modification	$ 1,617	$ 0	$ 1,849	$ 169
Modified Within the Previous Twelve Months that Have Subsequently Defaulted, Number of Contracts | contract	0	0	1	0
Modified Within the Previous Twelve Months that Have Subsequently Defaulted, Amortized Cost	$ 0	$ 0	$ 5,998	$ 0
Commercial | Income producing commercial real estate | Rate Reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-Modification Outstanding Amortized Cost by Type of Modification	0	0	0	0
Commercial | Income producing commercial real estate | Structure
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-Modification Outstanding Amortized Cost by Type of Modification	0	0	67	169
Commercial | Income producing commercial real estate | Other
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-Modification Outstanding Amortized Cost by Type of Modification	$ 1,617	$ 0	$ 1,782	$ 0
Commercial | Commercial & industrial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | contract	2	0	3	1
Post-Modification Outstanding Amortized Cost by Type of Modification	$ 193	$ 0	$ 208	$ 7
Modified Within the Previous Twelve Months that Have Subsequently Defaulted, Number of Contracts | contract	0	0	2	0
Modified Within the Previous Twelve Months that Have Subsequently Defaulted, Amortized Cost	$ 0	$ 0	$ 633	$ 0
Commercial | Commercial & industrial | Rate Reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-Modification Outstanding Amortized Cost by Type of Modification	0	0	0	0
Commercial | Commercial & industrial | Structure
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-Modification Outstanding Amortized Cost by Type of Modification	193	0	193	0
Commercial | Commercial & industrial | Other
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-Modification Outstanding Amortized Cost by Type of Modification	$ 0	$ 0	$ 15	$ 7
Commercial | Construction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | contract	6	0	7	0
Post-Modification Outstanding Amortized Cost by Type of Modification	$ 647	$ 0	$ 902	$ 0
Modified Within the Previous Twelve Months that Have Subsequently Defaulted, Number of Contracts | contract	0	0	0	0
Modified Within the Previous Twelve Months that Have Subsequently Defaulted, Amortized Cost	$ 0	$ 0	$ 0	$ 0
Commercial | Construction | Rate Reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-Modification Outstanding Amortized Cost by Type of Modification	0	0	0	0
Commercial | Construction | Structure
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-Modification Outstanding Amortized Cost by Type of Modification	577	0	832	0
Commercial | Construction | Other
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-Modification Outstanding Amortized Cost by Type of Modification	$ 70	$ 0	$ 70	$ 0
Commercial | Equipment financing
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | contract	7	2	143	3
Post-Modification Outstanding Amortized Cost by Type of Modification	$ 247	$ 93	$ 4,152	$ 113
Modified Within the Previous Twelve Months that Have Subsequently Defaulted, Number of Contracts | contract	9	0	15	0
Modified Within the Previous Twelve Months that Have Subsequently Defaulted, Amortized Cost	$ 290	$ 0	$ 600	$ 0
Commercial | Equipment financing | Rate Reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-Modification Outstanding Amortized Cost by Type of Modification	0	0	0	0
Commercial | Equipment financing | Structure
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-Modification Outstanding Amortized Cost by Type of Modification	247	93	4,152	113
Commercial | Equipment financing | Other
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-Modification Outstanding Amortized Cost by Type of Modification	$ 0	$ 0	$ 0	$ 0
Residential | Construction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | contract	3	0	3	1
Post-Modification Outstanding Amortized Cost by Type of Modification	$ 123	$ 0	$ 123	$ 21
Modified Within the Previous Twelve Months that Have Subsequently Defaulted, Number of Contracts | contract	0	0	0	1
Modified Within the Previous Twelve Months that Have Subsequently Defaulted, Amortized Cost	$ 0	$ 0	$ 0	$ 13
Residential | Construction | Rate Reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-Modification Outstanding Amortized Cost by Type of Modification	0	0	0	0
Residential | Construction | Structure
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-Modification Outstanding Amortized Cost by Type of Modification	123	0	123	0
Residential | Construction | Other
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-Modification Outstanding Amortized Cost by Type of Modification	$ 0	$ 0	$ 0	$ 21
Residential | Residential mortgage
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | contract	25	2	36	11
Post-Modification Outstanding Amortized Cost by Type of Modification	$ 3,200	$ 609	$ 4,122	$ 1,784
Modified Within the Previous Twelve Months that Have Subsequently Defaulted, Number of Contracts | contract	0	0	0	1
Modified Within the Previous Twelve Months that Have Subsequently Defaulted, Amortized Cost	$ 0	$ 0	$ 0	$ 135
Residential | Residential mortgage | Rate Reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-Modification Outstanding Amortized Cost by Type of Modification	0	0	0	0
Residential | Residential mortgage | Structure
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-Modification Outstanding Amortized Cost by Type of Modification	3,200	609	4,122	1,784
Residential | Residential mortgage | Other
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-Modification Outstanding Amortized Cost by Type of Modification	$ 0	$ 0	$ 0	$ 0
Residential | Home equity lines of credit
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | contract	4	0	4	1
Post-Modification Outstanding Amortized Cost by Type of Modification	$ 164	$ 0	$ 164	$ 50
Modified Within the Previous Twelve Months that Have Subsequently Defaulted, Number of Contracts | contract	0	0	0	0
Modified Within the Previous Twelve Months that Have Subsequently Defaulted, Amortized Cost	$ 0	$ 0	$ 0	$ 0
Residential | Home equity lines of credit | Rate Reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-Modification Outstanding Amortized Cost by Type of Modification	0	0	0	0
Residential | Home equity lines of credit | Structure
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-Modification Outstanding Amortized Cost by Type of Modification	164	0	164	50
Residential | Home equity lines of credit | Other
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-Modification Outstanding Amortized Cost by Type of Modification	$ 0	$ 0	$ 0	$ 0
Consumer
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | contract	3	3	6	3
Post-Modification Outstanding Amortized Cost by Type of Modification	$ 11	$ 21	$ 29	$ 21
Modified Within the Previous Twelve Months that Have Subsequently Defaulted, Number of Contracts | contract	0	0	1	0
Modified Within the Previous Twelve Months that Have Subsequently Defaulted, Amortized Cost	$ 0	$ 0	$ 3	$ 0
Consumer | Rate Reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-Modification Outstanding Amortized Cost by Type of Modification	0	0	0	0
Consumer | Structure
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-Modification Outstanding Amortized Cost by Type of Modification	11	0	11	0
Consumer | Other
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-Modification Outstanding Amortized Cost by Type of Modification	$ 0	$ 21	$ 18	$ 21