Loans and Leases and the Allowance for Loan and Lease Losses (Troubled Debt Restructuring & Narrative) (Details 6) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2017 USD ($) contract	Sep. 30, 2016 USD ($) contract	Sep. 30, 2017 USD ($) contract	Sep. 30, 2016 USD ($) contract	Dec. 31, 2016 USD ($)
Information related to loans modified as a TDR
Recorded Investment	$ 59,200		$ 59,200		$ 60,000
Available Commitments to Lend Additional Funds on Loans Modified as TDR			$ 0		$ 400
Number of Contracts | contract	162	149	480	355
Recorded Investment (as of period end)	$ 4,727	$ 3,040	$ 17,722	$ 11,537
Increase in Allowance (as of period end)	$ 162	$ 313	$ 287	$ 395
Residential Mortgage | Maximum
Information related to loans modified as a TDR
Period of Time Loan Being Fully Amortized			40 years
Land Loan | Maximum
Information related to loans modified as a TDR
Period of Time Loan Being Fully Amortized			360 months
Extending Balloon Payments			5 years
Commercial
Information related to loans modified as a TDR
Number of Contracts | contract	3	5	15	7
Recorded Investment (as of period end)	$ 1,505	$ 305	$ 9,492	$ 3,292
Increase in Allowance (as of period end)	$ 93	$ 3	$ 105	$ 3
Commercial | Commercial and Industrial
Information related to loans modified as a TDR
Number of Contracts | contract	1	4	12	6
Recorded Investment (as of period end)	$ 198	$ 97	$ 7,485	$ 3,084
Increase in Allowance (as of period end)	$ 0	$ 1	$ 12	$ 1
Commercial | Commercial Mortgage
Information related to loans modified as a TDR
Number of Contracts | contract	2	1	3	1
Recorded Investment (as of period end)	$ 1,307	$ 208	$ 2,007	$ 208
Increase in Allowance (as of period end)	$ 93	$ 2	$ 93	$ 2
Consumer
Information related to loans modified as a TDR
Number of Contracts | contract	159	144	465	348
Recorded Investment (as of period end)	$ 3,222	$ 2,735	$ 8,230	$ 8,245
Increase in Allowance (as of period end)	$ 69	$ 310	$ 182	$ 392
Consumer | Residential Mortgage
Information related to loans modified as a TDR
Number of Contracts | contract	0	3	0	8
Recorded Investment (as of period end)	$ 0	$ 547	$ 0	$ 3,025
Increase in Allowance (as of period end)	$ 0	$ 258	$ 0	$ 274
Consumer | Home Equity
Information related to loans modified as a TDR
Number of Contracts | contract	2	0	3	1
Recorded Investment (as of period end)	$ 203	$ 0	$ 442	$ 476
Increase in Allowance (as of period end)	$ 1	$ 0	$ 5	$ 5
Consumer | Automobile
Information related to loans modified as a TDR
Number of Contracts | contract	123	79	326	184
Recorded Investment (as of period end)	$ 2,636	$ 1,678	$ 6,657	$ 3,617
Increase in Allowance (as of period end)	$ 59	$ 38	$ 149	$ 82
Consumer | Other
Information related to loans modified as a TDR
Number of Contracts | contract	34	62	136	155
Recorded Investment (as of period end)	$ 383	$ 510	$ 1,131	$ 1,127
Increase in Allowance (as of period end)	$ 9	$ 14	$ 28	$ 31