Loans and Leases - Credit Risk Profile by Payment Activity (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Loans and Leases Receivable Disclosure [Line Items]
Portfolio loans and leases	$ 3,389,501	$ 3,285,858
Originated
Loans and Leases Receivable Disclosure [Line Items]
Portfolio loans and leases	2,700,814	2,487,296
Residential mortgage
Loans and Leases Receivable Disclosure [Line Items]
Portfolio loans and leases	449,060	458,886
Residential mortgage | Originated
Loans and Leases Receivable Disclosure [Line Items]
Portfolio loans and leases	358,271	360,935
Home equity loans and lines
Loans and Leases Receivable Disclosure [Line Items]
Portfolio loans and leases	206,429	218,275
Home equity loans and lines | Originated
Loans and Leases Receivable Disclosure [Line Items]
Portfolio loans and leases	176,771	183,283
Consumer
Loans and Leases Receivable Disclosure [Line Items]
Portfolio loans and leases	51,462	38,153
Consumer | Originated
Loans and Leases Receivable Disclosure [Line Items]
Portfolio loans and leases	49,828	35,146
Leases
Loans and Leases Receivable Disclosure [Line Items]
Portfolio loans and leases	132,649	115,401
Leases | Originated
Loans and Leases Receivable Disclosure [Line Items]
Portfolio loans and leases	97,506	68,035
Performing Financial Instruments
Loans and Leases Receivable Disclosure [Line Items]
Portfolio loans and leases	832,748	824,714
Performing Financial Instruments | Originated
Loans and Leases Receivable Disclosure [Line Items]
Portfolio loans and leases	678,353	644,570
Performing Financial Instruments | Financial Asset Acquired With and Without Credit Deterioration
Loans and Leases Receivable Disclosure [Line Items]
Portfolio loans and leases	154,395	180,144
Performing Financial Instruments | Residential mortgage
Loans and Leases Receivable Disclosure [Line Items]
Portfolio loans and leases	446,413	454,469
Performing Financial Instruments | Residential mortgage | Originated
Loans and Leases Receivable Disclosure [Line Items]
Portfolio loans and leases	356,656	359,430
Performing Financial Instruments | Residential mortgage | Financial Asset Acquired With and Without Credit Deterioration
Loans and Leases Receivable Disclosure [Line Items]
Portfolio loans and leases	89,757	95,039
Performing Financial Instruments | Home equity loans and lines
Loans and Leases Receivable Disclosure [Line Items]
Portfolio loans and leases	204,106	216,794
Performing Financial Instruments | Home equity loans and lines | Originated
Loans and Leases Receivable Disclosure [Line Items]
Portfolio loans and leases	174,938	182,062
Performing Financial Instruments | Home equity loans and lines | Financial Asset Acquired With and Without Credit Deterioration
Loans and Leases Receivable Disclosure [Line Items]
Portfolio loans and leases	29,168	34,732
Performing Financial Instruments | Consumer
Loans and Leases Receivable Disclosure [Line Items]
Portfolio loans and leases	51,462	38,153
Performing Financial Instruments | Consumer | Originated
Loans and Leases Receivable Disclosure [Line Items]
Portfolio loans and leases	49,828	35,146
Performing Financial Instruments | Consumer | Financial Asset Acquired With and Without Credit Deterioration
Loans and Leases Receivable Disclosure [Line Items]
Portfolio loans and leases	1,634	3,007
Performing Financial Instruments | Leases
Loans and Leases Receivable Disclosure [Line Items]
Portfolio loans and leases	130,767	115,298
Performing Financial Instruments | Leases | Originated
Loans and Leases Receivable Disclosure [Line Items]
Portfolio loans and leases	96,931	67,932
Performing Financial Instruments | Leases | Financial Asset Acquired With and Without Credit Deterioration
Loans and Leases Receivable Disclosure [Line Items]
Portfolio loans and leases	33,836	47,366
Nonperforming Financial Instruments
Loans and Leases Receivable Disclosure [Line Items]
Portfolio loans and leases	6,852	6,001
Nonperforming Financial Instruments | Originated
Loans and Leases Receivable Disclosure [Line Items]
Portfolio loans and leases	4,023	2,829
Nonperforming Financial Instruments | Financial Asset Acquired With and Without Credit Deterioration
Loans and Leases Receivable Disclosure [Line Items]
Portfolio loans and leases	2,829	3,172
Nonperforming Financial Instruments | Residential mortgage
Loans and Leases Receivable Disclosure [Line Items]
Portfolio loans and leases	2,647	4,417
Nonperforming Financial Instruments | Residential mortgage | Originated
Loans and Leases Receivable Disclosure [Line Items]
Portfolio loans and leases	1,615	1,505
Nonperforming Financial Instruments | Residential mortgage | Financial Asset Acquired With and Without Credit Deterioration
Loans and Leases Receivable Disclosure [Line Items]
Portfolio loans and leases	1,032	2,912
Nonperforming Financial Instruments | Home equity loans and lines
Loans and Leases Receivable Disclosure [Line Items]
Portfolio loans and leases	2,323	1,481
Nonperforming Financial Instruments | Home equity loans and lines | Originated
Loans and Leases Receivable Disclosure [Line Items]
Portfolio loans and leases	1,833	1,221
Nonperforming Financial Instruments | Home equity loans and lines | Financial Asset Acquired With and Without Credit Deterioration
Loans and Leases Receivable Disclosure [Line Items]
Portfolio loans and leases	490	260
Nonperforming Financial Instruments | Consumer
Loans and Leases Receivable Disclosure [Line Items]
Portfolio loans and leases	0	0
Nonperforming Financial Instruments | Consumer | Originated
Loans and Leases Receivable Disclosure [Line Items]
Portfolio loans and leases	0	0
Nonperforming Financial Instruments | Consumer | Financial Asset Acquired With and Without Credit Deterioration
Loans and Leases Receivable Disclosure [Line Items]
Portfolio loans and leases	0	0
Nonperforming Financial Instruments | Leases
Loans and Leases Receivable Disclosure [Line Items]
Portfolio loans and leases	1,882	103
Nonperforming Financial Instruments | Leases | Originated
Loans and Leases Receivable Disclosure [Line Items]
Portfolio loans and leases	575	103
Nonperforming Financial Instruments | Leases | Financial Asset Acquired With and Without Credit Deterioration
Loans and Leases Receivable Disclosure [Line Items]
Portfolio loans and leases	1,307	0
Performing and Non-performing
Loans and Leases Receivable Disclosure [Line Items]
Portfolio loans and leases	839,600	830,715
Performing and Non-performing | Originated
Loans and Leases Receivable Disclosure [Line Items]
Portfolio loans and leases	682,376	647,399
Performing and Non-performing | Financial Asset Acquired With and Without Credit Deterioration
Loans and Leases Receivable Disclosure [Line Items]
Portfolio loans and leases	157,224	183,316
Performing and Non-performing | Residential mortgage
Loans and Leases Receivable Disclosure [Line Items]
Portfolio loans and leases	449,060	458,886
Performing and Non-performing | Residential mortgage | Originated
Loans and Leases Receivable Disclosure [Line Items]
Portfolio loans and leases	358,271	360,935
Performing and Non-performing | Residential mortgage | Financial Asset Acquired With and Without Credit Deterioration
Loans and Leases Receivable Disclosure [Line Items]
Portfolio loans and leases	90,789	97,951
Performing and Non-performing | Home equity loans and lines
Loans and Leases Receivable Disclosure [Line Items]
Portfolio loans and leases	206,429	218,275
Performing and Non-performing | Home equity loans and lines | Originated
Loans and Leases Receivable Disclosure [Line Items]
Portfolio loans and leases	176,771	183,283
Performing and Non-performing | Home equity loans and lines | Financial Asset Acquired With and Without Credit Deterioration
Loans and Leases Receivable Disclosure [Line Items]
Portfolio loans and leases	29,658	34,992
Performing and Non-performing | Consumer
Loans and Leases Receivable Disclosure [Line Items]
Portfolio loans and leases	51,462	38,153
Performing and Non-performing | Consumer | Originated
Loans and Leases Receivable Disclosure [Line Items]
Portfolio loans and leases	49,828	35,146
Performing and Non-performing | Consumer | Financial Asset Acquired With and Without Credit Deterioration
Loans and Leases Receivable Disclosure [Line Items]
Portfolio loans and leases	1,634	3,007
Performing and Non-performing | Leases
Loans and Leases Receivable Disclosure [Line Items]
Portfolio loans and leases	132,649	115,401
Performing and Non-performing | Leases | Originated
Loans and Leases Receivable Disclosure [Line Items]
Portfolio loans and leases	97,506	68,035
Performing and Non-performing | Leases | Financial Asset Acquired With and Without Credit Deterioration
Loans and Leases Receivable Disclosure [Line Items]
Portfolio loans and leases	$ 35,143	$ 47,366