Allowance for Loan Losses, Allowance for Losses on Lending-Related Commitments and Impaired Loans (Schedule of Aging of the Company's Loan Portfolio) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	$ 105,326	$ 77,602
90+ days and still accruing	18,872	22,659
Current	23,526,168	21,408,938
Loans, net of unearned income	23,820,691	21,640,797
Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	50,984	15,696
90+ days and still accruing	3,313	877
Current	7,737,729	6,737,479
Loans, net of unearned income	7,828,538	6,787,677
Commercial | Commercial, industrial and other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	34,298	11,260
90+ days and still accruing	0	0
Current	5,062,729	4,314,107
Loans, net of unearned income	5,120,096	4,342,505
Commercial | Franchise
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	16,051	2,447
90+ days and still accruing	0	0
Current	924,190	845,150
Loans, net of unearned income	948,979	847,597
Commercial | Mortgage warehouse lines of credit
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	0	0
90+ days and still accruing	0	0
Current	144,199	190,523
Loans, net of unearned income	144,199	194,523
Commercial | Asset-based lending
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	635	1,550
90+ days and still accruing	0	0
Current	1,022,065	968,576
Loans, net of unearned income	1,026,056	980,466
Commercial | Leases
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	0	439
90+ days and still accruing	0	0
Current	564,430	410,772
Loans, net of unearned income	565,680	413,172
Commercial | PCI - commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	0	0
90+ days and still accruing	3,313	877
Current	20,116	8,351
Loans, net of unearned income	23,528	9,414
Commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	19,129	22,048
90+ days and still accruing	6,241	7,135
Current	6,845,490	6,517,763
Loans, net of unearned income	6,933,252	6,580,618
Commercial real estate | Construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	1,554	3,143
90+ days and still accruing	0	0
Current	749,846	742,171
Loans, net of unearned income	760,824	745,514
Commercial real estate | Land
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	107	188
90+ days and still accruing	0	0
Current	141,097	121,140
Loans, net of unearned income	141,481	126,484
Commercial real estate | Office
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	3,629	2,438
90+ days and still accruing	0	0
Current	929,739	887,937
Loans, net of unearned income	939,322	894,833
Commercial real estate | Industrial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	285	811
90+ days and still accruing	0	0
Current	885,367	879,796
Loans, net of unearned income	902,248	883,019
Commercial real estate | Retail
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	10,753	12,328
90+ days and still accruing	0	0
Current	878,106	938,383
Loans, net of unearned income	892,478	951,527
Commercial real estate | Multi-family
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	311	0
90+ days and still accruing	0	0
Current	970,597	914,610
Loans, net of unearned income	976,560	915,644
Commercial real estate | Mixed use and other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	2,490	3,140
90+ days and still accruing	0	0
Current	2,192,105	1,921,501
Loans, net of unearned income	2,205,195	1,935,705
Commercial real estate | PCI - commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	0	0
90+ days and still accruing	6,241	7,135
Current	98,633	112,225
Loans, net of unearned income	115,144	127,892
Home equity
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	7,147	8,978
90+ days and still accruing	0	0
Current	541,960	648,915
Loans, net of unearned income	552,343	663,045
Residential real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	16,383	17,977
90+ days and still accruing	1,292	5,304
Current	976,926	799,158
Loans, net of unearned income	1,002,464	832,120
Premium finance receivables | Commercial insurance loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	11,335	12,163
90+ days and still accruing	7,799	9,242
Current	2,796,058	2,579,515
Loans, net of unearned income	2,841,659	2,634,565
Premium finance receivables | Life insurance loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	0	0
90+ days and still accruing	0	0
Current	4,340,856	3,820,936
Loans, net of unearned income	4,373,891	3,835,790
Premium finance receivables | PCI - life insurance loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	0	0
90+ days and still accruing	0	0
Current	167,903	199,269
Loans, net of unearned income	167,903	199,269
Consumer and other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	348	740
90+ days and still accruing	227	101
Current	119,246	105,903
Loans, net of unearned income	120,641	107,713
60 to 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 to 89 days past due	34,176	33,260
60 to 89 Days Past Due | Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 to 89 days past due	1,651	4,218
60 to 89 Days Past Due | Commercial | Commercial, industrial and other
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 to 89 days past due	1,451	3,746
60 to 89 Days Past Due | Commercial | Franchise
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 to 89 days past due	0	0
60 to 89 Days Past Due | Commercial | Mortgage warehouse lines of credit
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 to 89 days past due	0	0
60 to 89 Days Past Due | Commercial | Asset-based lending
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 to 89 days past due	200	283
60 to 89 Days Past Due | Commercial | Leases
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 to 89 days past due	0	3
60 to 89 Days Past Due | Commercial | PCI - commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 to 89 days past due	0	186
60 to 89 Days Past Due | Commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 to 89 days past due	10,826	4,346
60 to 89 Days Past Due | Commercial real estate | Construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 to 89 days past due	0	0
60 to 89 Days Past Due | Commercial real estate | Land
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 to 89 days past due	170	0
60 to 89 Days Past Due | Commercial real estate | Office
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 to 89 days past due	877	0
60 to 89 Days Past Due | Commercial real estate | Industrial
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 to 89 days past due	0	0
60 to 89 Days Past Due | Commercial real estate | Retail
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 to 89 days past due	1,890	668
60 to 89 Days Past Due | Commercial real estate | Multi-family
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 to 89 days past due	77	0
60 to 89 Days Past Due | Commercial real estate | Mixed use and other
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 to 89 days past due	1,617	1,423
60 to 89 Days Past Due | Commercial real estate | PCI - commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 to 89 days past due	6,195	2,255
60 to 89 Days Past Due | Home equity
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 to 89 days past due	131	518
60 to 89 Days Past Due | Residential real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 to 89 days past due	1,692	1,303
60 to 89 Days Past Due | Premium finance receivables | Commercial insurance loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 to 89 days past due	11,382	17,796
60 to 89 Days Past Due | Premium finance receivables | Life insurance loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 to 89 days past due	8,407	4,837
60 to 89 Days Past Due | Premium finance receivables | PCI - life insurance loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 to 89 days past due	0	0
60 to 89 Days Past Due | Consumer and other
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 to 89 days past due	87	242
30 to 59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 to 89 days past due	136,149	98,338
30 to 59 Days Past Due | Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 to 89 days past due	34,861	29,407
30 to 59 Days Past Due | Commercial | Commercial, industrial and other
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 to 89 days past due	21,618	13,392
30 to 59 Days Past Due | Commercial | Franchise
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 to 89 days past due	8,738	0
30 to 59 Days Past Due | Commercial | Mortgage warehouse lines of credit
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 to 89 days past due	0	4,000
30 to 59 Days Past Due | Commercial | Asset-based lending
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 to 89 days past due	3,156	10,057
30 to 59 Days Past Due | Commercial | Leases
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 to 89 days past due	1,250	1,958
30 to 59 Days Past Due | Commercial | PCI - commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 to 89 days past due	99	0
30 to 59 Days Past Due | Commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 to 89 days past due	51,566	29,326
30 to 59 Days Past Due | Commercial real estate | Construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 to 89 days past due	9,424	200
30 to 59 Days Past Due | Commercial real estate | Land
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 to 89 days past due	107	5,156
30 to 59 Days Past Due | Commercial real estate | Office
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 to 89 days past due	5,077	4,458
30 to 59 Days Past Due | Commercial real estate | Industrial
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 to 89 days past due	16,596	2,412
30 to 59 Days Past Due | Commercial real estate | Retail
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 to 89 days past due	1,729	148
30 to 59 Days Past Due | Commercial real estate | Multi-family
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 to 89 days past due	5,575	1,034
30 to 59 Days Past Due | Commercial real estate | Mixed use and other
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 to 89 days past due	8,983	9,641
30 to 59 Days Past Due | Commercial real estate | PCI - commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 to 89 days past due	4,075	6,277
30 to 59 Days Past Due | Home equity
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 to 89 days past due	3,105	4,634
30 to 59 Days Past Due | Residential real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 to 89 days past due	6,171	8,378
30 to 59 Days Past Due | Premium finance receivables | Commercial insurance loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 to 89 days past due	15,085	15,849
30 to 59 Days Past Due | Premium finance receivables | Life insurance loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 to 89 days past due	24,628	10,017
30 to 59 Days Past Due | Premium finance receivables | PCI - life insurance loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 to 89 days past due	0	0
30 to 59 Days Past Due | Consumer and other
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 to 89 days past due	$ 733	$ 727