Loans and Leases and Allowance for Credit Losses - Loans modified under terms of TDR (Details) - Loans Receivable $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($) contract	Dec. 31, 2018 USD ($) contract	Dec. 31, 2017 USD ($) contract
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | contract	55	64	78
Pre-Modification Outstanding Recorded Investment	$ 14,688	$ 7,971	$ 7,168
Post-Modification Outstanding Recorded Investment by Type of Modification	$ 14,340	$ 7,798	$ 6,506
Troubled Debt Restructurings That Have Subsequently Defaulted, Number of Contracts | contract	2	6	4
Troubled Debt Restructurings That Have Subsequently Defaulted, Recorded Investment	$ 148	$ 2,205	$ 852
Rate Reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-Modification Outstanding Recorded Investment by Type of Modification	0	236	40
Structure
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-Modification Outstanding Recorded Investment by Type of Modification	14,005	6,858	4,611
Other
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-Modification Outstanding Recorded Investment by Type of Modification	$ 335	$ 704	$ 1,855
Indirect auto
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | contract	15	35	34
Pre-Modification Outstanding Recorded Investment	$ 271	$ 643	$ 786
Post-Modification Outstanding Recorded Investment by Type of Modification	$ 262	$ 643	$ 786
Troubled Debt Restructurings That Have Subsequently Defaulted, Number of Contracts | contract	0	0	0
Troubled Debt Restructurings That Have Subsequently Defaulted, Recorded Investment	$ 0	$ 0	$ 0
Indirect auto | Rate Reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-Modification Outstanding Recorded Investment by Type of Modification	0	0	0
Indirect auto | Structure
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-Modification Outstanding Recorded Investment by Type of Modification	0	0	0
Indirect auto | Other
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-Modification Outstanding Recorded Investment by Type of Modification	$ 262	$ 643	$ 786
Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | contract	18	9	14
Pre-Modification Outstanding Recorded Investment	$ 12,197	$ 5,299	$ 3,761
Post-Modification Outstanding Recorded Investment by Type of Modification	$ 11,905	$ 5,162	$ 3,228
Troubled Debt Restructurings That Have Subsequently Defaulted, Number of Contracts | contract	0	5	0
Troubled Debt Restructurings That Have Subsequently Defaulted, Recorded Investment	$ 0	$ 2,104	$ 0
Commercial | Rate Reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-Modification Outstanding Recorded Investment by Type of Modification	0	106	0
Commercial | Structure
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-Modification Outstanding Recorded Investment by Type of Modification	11,898	5,056	2,335
Commercial | Other
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-Modification Outstanding Recorded Investment by Type of Modification	$ 7	$ 0	$ 893
Commercial | Owner occupied commercial real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | contract	4	5	6
Pre-Modification Outstanding Recorded Investment	$ 1,864	$ 1,438	$ 2,603
Post-Modification Outstanding Recorded Investment by Type of Modification	$ 1,739	$ 1,387	$ 2,269
Troubled Debt Restructurings That Have Subsequently Defaulted, Number of Contracts | contract	0	3	0
Troubled Debt Restructurings That Have Subsequently Defaulted, Recorded Investment	$ 0	$ 1,869	$ 0
Commercial | Owner occupied commercial real estate | Rate Reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-Modification Outstanding Recorded Investment by Type of Modification	0	0	0
Commercial | Owner occupied commercial real estate | Structure
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-Modification Outstanding Recorded Investment by Type of Modification	1,739	1,387	2,161
Commercial | Owner occupied commercial real estate | Other
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-Modification Outstanding Recorded Investment by Type of Modification	$ 0	$ 0	$ 108
Commercial | Income producing commercial real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | contract	3	2	2
Pre-Modification Outstanding Recorded Investment	$ 9,126	$ 3,753	$ 257
Post-Modification Outstanding Recorded Investment by Type of Modification	$ 9,013	$ 3,743	$ 252
Troubled Debt Restructurings That Have Subsequently Defaulted, Number of Contracts | contract	0	0	0
Troubled Debt Restructurings That Have Subsequently Defaulted, Recorded Investment	$ 0	$ 0	$ 0
Commercial | Income producing commercial real estate | Rate Reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-Modification Outstanding Recorded Investment by Type of Modification	0	106	0
Commercial | Income producing commercial real estate | Structure
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-Modification Outstanding Recorded Investment by Type of Modification	9,013	3,637	0
Commercial | Income producing commercial real estate | Other
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-Modification Outstanding Recorded Investment by Type of Modification	$ 0	$ 0	$ 252
Commercial | Commercial & industrial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | contract	2	2	6
Pre-Modification Outstanding Recorded Investment	$ 136	$ 108	$ 901
Post-Modification Outstanding Recorded Investment by Type of Modification	$ 82	$ 32	$ 707
Troubled Debt Restructurings That Have Subsequently Defaulted, Number of Contracts | contract	0	1	0
Troubled Debt Restructurings That Have Subsequently Defaulted, Recorded Investment	$ 0	$ 232	$ 0
Commercial | Commercial & industrial | Rate Reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-Modification Outstanding Recorded Investment by Type of Modification	0	0	0
Commercial | Commercial & industrial | Structure
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-Modification Outstanding Recorded Investment by Type of Modification	75	32	174
Commercial | Commercial & industrial | Other
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-Modification Outstanding Recorded Investment by Type of Modification	$ 7	$ 0	$ 533
Commercial | Construction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | contract	0	0	0
Pre-Modification Outstanding Recorded Investment	$ 0	$ 0	$ 0
Post-Modification Outstanding Recorded Investment by Type of Modification	$ 0	$ 0	$ 0
Troubled Debt Restructurings That Have Subsequently Defaulted, Number of Contracts | contract	0	1	0
Troubled Debt Restructurings That Have Subsequently Defaulted, Recorded Investment	$ 0	$ 3	$ 0
Commercial | Construction | Rate Reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-Modification Outstanding Recorded Investment by Type of Modification	0	0	0
Commercial | Construction | Structure
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-Modification Outstanding Recorded Investment by Type of Modification	0	0	0
Commercial | Construction | Other
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-Modification Outstanding Recorded Investment by Type of Modification	$ 0	$ 0	$ 0
Commercial | Equipment financing
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | contract	9	0	0
Pre-Modification Outstanding Recorded Investment	$ 1,071	$ 0	$ 0
Post-Modification Outstanding Recorded Investment by Type of Modification	$ 1,071	$ 0	$ 0
Troubled Debt Restructurings That Have Subsequently Defaulted, Number of Contracts | contract	0	0	0
Troubled Debt Restructurings That Have Subsequently Defaulted, Recorded Investment	$ 0	$ 0	$ 0
Commercial | Equipment financing | Rate Reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-Modification Outstanding Recorded Investment by Type of Modification	0	0	0
Commercial | Equipment financing | Structure
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-Modification Outstanding Recorded Investment by Type of Modification	1,071	0	0
Commercial | Equipment financing | Other
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-Modification Outstanding Recorded Investment by Type of Modification	$ 0	$ 0	$ 0
Residential | Construction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | contract	1	2	4
Pre-Modification Outstanding Recorded Investment	$ 22	$ 47	$ 135
Post-Modification Outstanding Recorded Investment by Type of Modification	$ 21	$ 45	$ 135
Troubled Debt Restructurings That Have Subsequently Defaulted, Number of Contracts | contract	1	0	0
Troubled Debt Restructurings That Have Subsequently Defaulted, Recorded Investment	$ 13	$ 0	$ 0
Residential | Construction | Rate Reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-Modification Outstanding Recorded Investment by Type of Modification	0	0	40
Residential | Construction | Structure
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-Modification Outstanding Recorded Investment by Type of Modification	0	32	95
Residential | Construction | Other
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-Modification Outstanding Recorded Investment by Type of Modification	$ 21	$ 13	$ 0
Residential | Residential mortgage
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | contract	15	15	23
Pre-Modification Outstanding Recorded Investment	$ 2,102	$ 1,933	$ 2,174
Post-Modification Outstanding Recorded Investment by Type of Modification	$ 2,057	$ 1,900	$ 2,165
Troubled Debt Restructurings That Have Subsequently Defaulted, Number of Contracts | contract	1	1	4
Troubled Debt Restructurings That Have Subsequently Defaulted, Recorded Investment	$ 135	$ 101	$ 852
Residential | Residential mortgage | Rate Reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-Modification Outstanding Recorded Investment by Type of Modification	0	130	0
Residential | Residential mortgage | Structure
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-Modification Outstanding Recorded Investment by Type of Modification	2,057	1,770	2,165
Residential | Residential mortgage | Other
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-Modification Outstanding Recorded Investment by Type of Modification	$ 0	$ 0	$ 0
Residential | Home equity lines of credit
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | contract	1	1	1
Pre-Modification Outstanding Recorded Investment	$ 50	$ 42	$ 296
Post-Modification Outstanding Recorded Investment by Type of Modification	$ 50	$ 41	$ 176
Troubled Debt Restructurings That Have Subsequently Defaulted, Number of Contracts | contract	0	0	0
Troubled Debt Restructurings That Have Subsequently Defaulted, Recorded Investment	$ 0	$ 0	$ 0
Residential | Home equity lines of credit | Rate Reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-Modification Outstanding Recorded Investment by Type of Modification	0	0	0
Residential | Home equity lines of credit | Structure
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-Modification Outstanding Recorded Investment by Type of Modification	50	0	0
Residential | Home equity lines of credit | Other
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-Modification Outstanding Recorded Investment by Type of Modification	$ 0	$ 41	$ 176
Consumer
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | contract	5	2	2
Pre-Modification Outstanding Recorded Investment	$ 46	$ 7	$ 16
Post-Modification Outstanding Recorded Investment by Type of Modification	$ 45	$ 7	$ 16
Troubled Debt Restructurings That Have Subsequently Defaulted, Number of Contracts | contract	0	0	0
Troubled Debt Restructurings That Have Subsequently Defaulted, Recorded Investment	$ 0	$ 0	$ 0
Consumer | Rate Reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-Modification Outstanding Recorded Investment by Type of Modification	0	0	0
Consumer | Structure
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-Modification Outstanding Recorded Investment by Type of Modification	0	0	16
Consumer | Other
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-Modification Outstanding Recorded Investment by Type of Modification	$ 45	$ 7	$ 0