Allowance for Loan Losses, Allowance for Losses on Lending-Related Commitments and Impaired Loans (Summary of Impaired Loans Evaluated for Impairment by Loan Class) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Financing Receivable, Impaired [Line Items]
Impaired loans with a related ASC 310 allowance recorded	$ 60,219	$ 36,084
Related Allowance	11,437	8,023
Impaired loans with no related ASC 310 allowance recorded, Recorded Investment	67,050	69,004
Loans, net of unearned income, Recorded Investment	127,269	105,088
Loans, net of unearned income, Unpaid Principal Balance	139,246	127,566
Loans, net of unearned income, Average Recorded Investment	133,481	115,261	$ 105,400
Loans, net of unearned income, Interest Income Recognized	7,347	6,298	$ 5,500
Home equity
Financing Receivable, Impaired [Line Items]
Impaired loans with a related ASC 310 allowance recorded	3,133	1,606
Impaired loans with a related ASC 310 allowance recorded, Unpaid Principal Balance	3,470	1,869
Related Allowance	282	784
Impaired loans with a related ASC 310 allowance recorded, Average Recorded Investment	3,165	1,626
Impaired loans with a related ASC 310 allowance recorded, Interest Income Recognized	131	81
Impaired loans with no related ASC 310 allowance recorded, Recorded Investment	9,122	7,648
Impaired loans with no related ASC 310 allowance recorded, Unpaid Principal Balance	12,383	11,648
Impaired loans with no related ASC 310 allowance recorded, Average Recorded Investment	9,323	9,114
Impaired loans with no related ASC 310 allowance recorded, Interest Income Recognized	564	603
Residential real estate
Financing Receivable, Impaired [Line Items]
Impaired loans with a related ASC 310 allowance recorded	4,011	3,798
Impaired loans with a related ASC 310 allowance recorded, Unpaid Principal Balance	4,263	3,910
Related Allowance	204	586
Impaired loans with a related ASC 310 allowance recorded, Average Recorded Investment	4,056	3,790
Impaired loans with a related ASC 310 allowance recorded, Interest Income Recognized	159	146
Impaired loans with no related ASC 310 allowance recorded, Recorded Investment	18,053	17,455
Impaired loans with no related ASC 310 allowance recorded, Unpaid Principal Balance	20,765	20,327
Impaired loans with no related ASC 310 allowance recorded, Average Recorded Investment	18,552	17,926
Impaired loans with no related ASC 310 allowance recorded, Interest Income Recognized	883	860
Consumer and other
Financing Receivable, Impaired [Line Items]
Impaired loans with a related ASC 310 allowance recorded	116	26
Impaired loans with a related ASC 310 allowance recorded, Unpaid Principal Balance	129	28
Related Allowance	116	26
Impaired loans with a related ASC 310 allowance recorded, Average Recorded Investment	119	27
Impaired loans with a related ASC 310 allowance recorded, Interest Income Recognized	7	2
Impaired loans with no related ASC 310 allowance recorded, Recorded Investment	281	733
Impaired loans with no related ASC 310 allowance recorded, Unpaid Principal Balance	407	890
Impaired loans with no related ASC 310 allowance recorded, Average Recorded Investment	293	773
Impaired loans with no related ASC 310 allowance recorded, Interest Income Recognized	20	48
Commercial, industrial and other | Commercial
Financing Receivable, Impaired [Line Items]
Impaired loans with a related ASC 310 allowance recorded	16,703	6,233
Impaired loans with a related ASC 310 allowance recorded, Unpaid Principal Balance	17,029	7,323
Related Allowance	4,866	3,951
Impaired loans with a related ASC 310 allowance recorded, Average Recorded Investment	17,868	7,220
Impaired loans with a related ASC 310 allowance recorded, Interest Income Recognized	1,181	452
Impaired loans with no related ASC 310 allowance recorded, Recorded Investment	18,314	8,460
Impaired loans with no related ASC 310 allowance recorded, Unpaid Principal Balance	21,501	12,259
Impaired loans with no related ASC 310 allowance recorded, Average Recorded Investment	20,547	10,170
Impaired loans with no related ASC 310 allowance recorded, Interest Income Recognized	1,143	683
Franchise | Commercial
Financing Receivable, Impaired [Line Items]
Impaired loans with a related ASC 310 allowance recorded	16,021	0
Impaired loans with a related ASC 310 allowance recorded, Unpaid Principal Balance	16,256	0
Related Allowance	1,375	0
Impaired loans with a related ASC 310 allowance recorded, Average Recorded Investment	16,221	0
Impaired loans with a related ASC 310 allowance recorded, Interest Income Recognized	909	0
Impaired loans with no related ASC 310 allowance recorded, Recorded Investment	5,152	16,256
Impaired loans with no related ASC 310 allowance recorded, Unpaid Principal Balance	5,154	16,256
Impaired loans with no related ASC 310 allowance recorded, Average Recorded Investment	5,320	17,089
Impaired loans with no related ASC 310 allowance recorded, Interest Income Recognized	403	780
Asset-based lending | Commercial
Financing Receivable, Impaired [Line Items]
Impaired loans with a related ASC 310 allowance recorded	557	948
Impaired loans with a related ASC 310 allowance recorded, Unpaid Principal Balance	557	949
Related Allowance	317	355
Impaired loans with a related ASC 310 allowance recorded, Average Recorded Investment	689	1,302
Impaired loans with a related ASC 310 allowance recorded, Interest Income Recognized	50	72
Impaired loans with no related ASC 310 allowance recorded, Recorded Investment	207	602
Impaired loans with no related ASC 310 allowance recorded, Unpaid Principal Balance	601	602
Impaired loans with no related ASC 310 allowance recorded, Average Recorded Investment	569	688
Impaired loans with no related ASC 310 allowance recorded, Interest Income Recognized	51	40
Leases | Commercial
Financing Receivable, Impaired [Line Items]
Impaired loans with a related ASC 310 allowance recorded	1,730	2,331
Impaired loans with a related ASC 310 allowance recorded, Unpaid Principal Balance	1,730	2,337
Related Allowance	0	158
Impaired loans with a related ASC 310 allowance recorded, Average Recorded Investment	1,812	2,463
Impaired loans with a related ASC 310 allowance recorded, Interest Income Recognized	91	117
Impaired loans with no related ASC 310 allowance recorded, Recorded Investment	845	782
Impaired loans with no related ASC 310 allowance recorded, Unpaid Principal Balance	879	782
Impaired loans with no related ASC 310 allowance recorded, Average Recorded Investment	936	845
Impaired loans with no related ASC 310 allowance recorded, Interest Income Recognized	56	49
Construction | Commercial real estate
Financing Receivable, Impaired [Line Items]
Impaired loans with a related ASC 310 allowance recorded	1,554	3,097
Impaired loans with a related ASC 310 allowance recorded, Unpaid Principal Balance	1,554	3,897
Related Allowance	550	403
Impaired loans with a related ASC 310 allowance recorded, Average Recorded Investment	1,554	3,690
Impaired loans with a related ASC 310 allowance recorded, Interest Income Recognized	76	197
Impaired loans with no related ASC 310 allowance recorded, Recorded Investment	1,117	1,367
Impaired loans with no related ASC 310 allowance recorded, Unpaid Principal Balance	1,117	1,678
Impaired loans with no related ASC 310 allowance recorded, Average Recorded Investment	1,218	1,555
Impaired loans with no related ASC 310 allowance recorded, Interest Income Recognized	52	84
Land | Commercial real estate
Financing Receivable, Impaired [Line Items]
Impaired loans with a related ASC 310 allowance recorded	0	0
Impaired loans with a related ASC 310 allowance recorded, Unpaid Principal Balance	0	0
Related Allowance	0	0
Impaired loans with a related ASC 310 allowance recorded, Average Recorded Investment	0
Impaired loans with a related ASC 310 allowance recorded, Interest Income Recognized	0	0
Impaired loans with no related ASC 310 allowance recorded, Recorded Investment	3,396	3,961
Impaired loans with no related ASC 310 allowance recorded, Unpaid Principal Balance	3,491	4,192
Impaired loans with no related ASC 310 allowance recorded, Average Recorded Investment	3,751	4,129
Impaired loans with no related ASC 310 allowance recorded, Interest Income Recognized	198	182
Office | Commercial real estate
Financing Receivable, Impaired [Line Items]
Impaired loans with a related ASC 310 allowance recorded	573	471
Impaired loans with a related ASC 310 allowance recorded, Unpaid Principal Balance	638	471
Related Allowance	21	5
Impaired loans with a related ASC 310 allowance recorded, Average Recorded Investment	587	481
Impaired loans with a related ASC 310 allowance recorded, Interest Income Recognized	25	24
Impaired loans with no related ASC 310 allowance recorded, Recorded Investment	3,629	2,438
Impaired loans with no related ASC 310 allowance recorded, Unpaid Principal Balance	3,642	6,140
Impaired loans with no related ASC 310 allowance recorded, Average Recorded Investment	3,651	3,484
Impaired loans with no related ASC 310 allowance recorded, Interest Income Recognized	184	330
Industrial | Commercial real estate
Financing Receivable, Impaired [Line Items]
Impaired loans with a related ASC 310 allowance recorded	0	408
Impaired loans with a related ASC 310 allowance recorded, Unpaid Principal Balance	0	408
Related Allowance	0	40
Impaired loans with a related ASC 310 allowance recorded, Average Recorded Investment	0	414
Impaired loans with a related ASC 310 allowance recorded, Interest Income Recognized	0	25
Impaired loans with no related ASC 310 allowance recorded, Recorded Investment	322	403
Impaired loans with no related ASC 310 allowance recorded, Unpaid Principal Balance	450	2,010
Impaired loans with no related ASC 310 allowance recorded, Average Recorded Investment	363	1,849
Impaired loans with no related ASC 310 allowance recorded, Interest Income Recognized	30	174
Retail | Commercial real estate
Financing Receivable, Impaired [Line Items]
Impaired loans with a related ASC 310 allowance recorded	14,633	15,599
Impaired loans with a related ASC 310 allowance recorded, Unpaid Principal Balance	14,633	15,657
Related Allowance	3,413	1,336
Impaired loans with a related ASC 310 allowance recorded, Average Recorded Investment	14,694	15,736
Impaired loans with a related ASC 310 allowance recorded, Interest Income Recognized	676	624
Impaired loans with no related ASC 310 allowance recorded, Recorded Investment	1,592	2,393
Impaired loans with no related ASC 310 allowance recorded, Unpaid Principal Balance	1,945	3,538
Impaired loans with no related ASC 310 allowance recorded, Average Recorded Investment	1,699	2,486
Impaired loans with no related ASC 310 allowance recorded, Interest Income Recognized	110	221
Multi-family | Commercial real estate
Financing Receivable, Impaired [Line Items]
Impaired loans with a related ASC 310 allowance recorded	0	0
Impaired loans with a related ASC 310 allowance recorded, Unpaid Principal Balance	0	0
Related Allowance	0	0
Impaired loans with a related ASC 310 allowance recorded, Average Recorded Investment	0	0
Impaired loans with a related ASC 310 allowance recorded, Interest Income Recognized	0	0
Impaired loans with no related ASC 310 allowance recorded, Recorded Investment	1,498	1,231
Impaired loans with no related ASC 310 allowance recorded, Unpaid Principal Balance	1,595	2,078
Impaired loans with no related ASC 310 allowance recorded, Average Recorded Investment	1,529	1,246
Impaired loans with no related ASC 310 allowance recorded, Interest Income Recognized	55	76
Mixed use and other | Commercial real estate
Financing Receivable, Impaired [Line Items]
Impaired loans with a related ASC 310 allowance recorded	1,188	1,567
Impaired loans with a related ASC 310 allowance recorded, Unpaid Principal Balance	1,221	1,586
Related Allowance	293	379
Impaired loans with a related ASC 310 allowance recorded, Average Recorded Investment	1,354	1,599
Impaired loans with a related ASC 310 allowance recorded, Interest Income Recognized	66	77
Impaired loans with no related ASC 310 allowance recorded, Recorded Investment	3,522	5,275
Impaired loans with no related ASC 310 allowance recorded, Unpaid Principal Balance	3,836	6,731
Impaired loans with no related ASC 310 allowance recorded, Average Recorded Investment	3,611	5,559
Impaired loans with no related ASC 310 allowance recorded, Interest Income Recognized	$ 227	$ 351