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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	Dec. 31, 2017 USD ($) loans	Dec. 31, 2016 USD ($) loans
Troubled debt restructurings:
Number of Loans | loans	27	30
Pre-Modification Recorded Investment	$ 18,485	$ 18,897
Post-Modification Recorded Investment	$ 9,147	$ 13,560
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	$ 880	$ 930
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	$ 34	$ 39
Land development
Troubled debt restructurings:
Number of Loans | loans	1	1
Pre-Modification Recorded Investment	$ 5,745	$ 5,745
Post-Modification Recorded Investment	$ 2,626	$ 3,440
Construction
Troubled debt restructurings:
Number of Loans | loans	0	2
Pre-Modification Recorded Investment	$ 0	$ 331
Post-Modification Recorded Investment	$ 0	$ 314
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	8	11
Pre-Modification Recorded Investment	$ 627	$ 1,391
Post-Modification Recorded Investment	$ 307	$ 1,393
Commercial and industrial
Troubled debt restructurings:
Number of Loans | loans	10	10
Pre-Modification Recorded Investment	$ 8,759	$ 8,094
Post-Modification Recorded Investment	$ 4,951	$ 7,058
Home equity and second mortgages
Troubled debt restructurings:
Number of Loans | loans	2	1
Pre-Modification Recorded Investment	$ 37	$ 37
Post-Modification Recorded Investment	$ 4	$ 8
Other
Troubled debt restructurings:
Number of Loans | loans	2	1
Pre-Modification Recorded Investment	$ 2,094	$ 2,076
Post-Modification Recorded Investment	$ 345	$ 378

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