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Loan and Lease Receivables, Impaired Loans and Leases and Allowance for Loan and Lease Losses (Troubled Debt Restructurings) (Details) $ in Thousands	Mar. 31, 2018 USD ($) loans	Dec. 31, 2017 USD ($) loans
Troubled debt restructurings
Number of Loans | loans	24	27
Pre-Modification Recorded Investment	$ 18,401	$ 18,485
Post-Modification Recorded Investment	$ 8,891	$ 9,147
Commercial real estate — owner occupied
Troubled debt restructurings
Number of Loans | loans	3	3
Pre-Modification Recorded Investment	$ 1,065	$ 1,065
Post-Modification Recorded Investment	$ 868	$ 880
Commercial real estate — non-owner occupied
Troubled debt restructurings
Number of Loans | loans	1	1
Pre-Modification Recorded Investment	$ 158	$ 158
Post-Modification Recorded Investment	$ 33	$ 34
Land development
Troubled debt restructurings
Number of Loans | loans	1	1
Pre-Modification Recorded Investment	$ 5,745	$ 5,745
Post-Modification Recorded Investment	$ 2,516	$ 2,626
Construction
Troubled debt restructurings
Number of Loans | loans	0	0
Pre-Modification Recorded Investment	$ 0	$ 0
Post-Modification Recorded Investment	$ 0	$ 0
Multi-family
Troubled debt restructurings
Number of Loans | loans	0	0
Pre-Modification Recorded Investment	$ 0	$ 0
Post-Modification Recorded Investment	$ 0	$ 0
1-4 family
Troubled debt restructurings
Number of Loans | loans	7	8
Pre-Modification Recorded Investment	$ 560	$ 627
Post-Modification Recorded Investment	$ 243	$ 307
Commercial and industrial
Troubled debt restructurings
Number of Loans | loans	10	10
Pre-Modification Recorded Investment	$ 8,759	$ 8,759
Post-Modification Recorded Investment	$ 4,913	$ 4,951
Home equity and second mortgages
Troubled debt restructurings
Number of Loans | loans	1	2
Pre-Modification Recorded Investment	$ 37	$ 37
Post-Modification Recorded Investment	$ 2	$ 4
Other
Troubled debt restructurings
Number of Loans | loans	1	2
Pre-Modification Recorded Investment	$ 2,077	$ 2,094
Post-Modification Recorded Investment	$ 316	$ 345

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