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, 2016	Dec. 31, 2015
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	$ 77,578	$ 78,950
90+ days and still accruing	33,738	41,872
Current	19,508,748	16,993,266
Total loans	19,761,317	17,266,790
Loans, net of unearned income excluding covered loans, Nonaccrual	75,457	73,072
Loans, net of unearned income excluding covered loans, 90+ days past due and still accruing	31,246	34,537
Loans, net of unearned income excluding covered loans, current	19,456,994	16,864,283
Loans, net of unearned income, excluding covered loans	19,703,172	17,118,117
Covered loans, Nonaccrual	2,121	5,878
Covered loans, 90+ days past due and still accruing	2,492	7,335
Covered loans, Current	51,754	128,983
Covered loans	58,145	148,673
Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	15,875	12,712
90+ days and still accruing	1,863	1,433
Current	5,967,468	4,666,927
Loans, net of unearned income, excluding covered loans	6,005,422	4,713,909
Commercial | Commercial, industrial and other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	13,441	12,704
90+ days and still accruing	174	6
Current	3,716,977	3,226,139
Loans, net of unearned income, excluding covered loans	3,744,712	3,258,528
Commercial | Franchise
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	0	0
90+ days and still accruing	0	0
Current	869,228	245,228
Loans, net of unearned income, excluding covered loans	869,721	245,228
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	204,225	222,806
Loans, net of unearned income, excluding covered loans	204,225	222,806
Commercial | Asset-based lending
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	1,924	8
90+ days and still accruing	0	0
Current	871,402	736,968
Loans, net of unearned income, excluding covered loans	875,070	742,684
Commercial | Leases
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	510	0
90+ days and still accruing	0	535
Current	293,073	220,599
Loans, net of unearned income, excluding covered loans	294,914	226,074
Commercial | PCI - commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	0	0
90+ days and still accruing	1,689	892
Current	12,563	15,187
Loans, net of unearned income, excluding covered loans	16,780	18,589
Commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	21,924	26,645
90+ days and still accruing	16,188	22,111
Current	6,110,999	5,424,863
Loans, net of unearned income, excluding covered loans	6,196,087	5,529,289
Commercial real estate | Construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	2,408	306
90+ days and still accruing	0	0
Current	606,007	355,338
Loans, net of unearned income, excluding covered loans	610,239	358,660
Commercial real estate | Land
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	394	1,751
90+ days and still accruing	0	0
Current	104,219	76,546
Loans, net of unearned income, excluding covered loans	104,801	78,417
Commercial real estate | Office
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	4,337	4,619
90+ days and still accruing	0	0
Current	857,599	853,801
Loans, net of unearned income, excluding covered loans	867,674	863,001
Commercial real estate | Industrial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	7,047	9,564
90+ days and still accruing	0	0
Current	756,602	715,207
Loans, net of unearned income, excluding covered loans	770,601	727,648
Commercial real estate | Retail
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	597	1,760
90+ days and still accruing	0	0
Current	907,872	863,887
Loans, net of unearned income, excluding covered loans	912,593	868,399
Commercial real estate | Multi-family
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	643	1,954
90+ days and still accruing	0	0
Current	805,312	733,230
Loans, net of unearned income, excluding covered loans	807,624	742,349
Commercial real estate | Mixed use and other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	6,498	6,691
90+ days and still accruing	0	0
Current	1,931,859	1,712,187
Loans, net of unearned income, excluding covered loans	1,952,175	1,732,816
Commercial real estate | PCI - commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	0	0
90+ days and still accruing	16,188	22,111
Current	141,529	114,667
Loans, net of unearned income, excluding covered loans	170,380	157,999
Home equity
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	9,761	6,848
90+ days and still accruing	0	0
Current	707,887	770,421
Loans, net of unearned income, excluding covered loans	725,793	784,675
Residential real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	12,749	12,043
90+ days and still accruing	1,309	488
Current	681,956	588,851
Loans, net of unearned income, excluding covered loans	705,221	607,451
Premium finance receivables | Commercial insurance loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	14,709	14,561
90+ days and still accruing	7,962	10,294
Current	2,435,684	2,321,786
Loans, net of unearned income, excluding covered loans	2,478,581	2,374,921
Premium finance receivables | Life insurance loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	0	0
90+ days and still accruing	3,717	0
Current	3,182,935	2,578,632
Loans, net of unearned income, excluding covered loans	3,220,370	2,593,204
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	249,657	368,292
Loans, net of unearned income, excluding covered loans	249,657	368,292
Consumer and other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	439	263
90+ days and still accruing	207	211
Current	120,408	144,511
Loans, net of unearned income, excluding covered loans	122,041	146,376
60 to 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 to 89 days past due	43,880	42,806
Loans, net of unearned income excluding covered loans, 60-89 days past due and still accruing	43,655	42,103
Covered loans, 60-89 days past due and still accruing	225	703
60 to 89 Days Past Due | Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 to 89 days past due	2,576	11,361
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	2,341	6,749
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	135	3,864
60 to 89 Days Past Due | Commercial | Leases
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 to 89 days past due	0	748
60 to 89 Days Past Due | Commercial | PCI - commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 to 89 days past due	100	0
60 to 89 Days Past Due | Commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 to 89 days past due	15,253	16,427
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	1,371
60 to 89 Days Past Due | Commercial real estate | Land
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 to 89 days past due	188	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	4,506	764
60 to 89 Days Past Due | Commercial real estate | Industrial
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 to 89 days past due	4,516	1,868
60 to 89 Days Past Due | Commercial real estate | Retail
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 to 89 days past due	760	442
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	322	597
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	1,186	6,723
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	3,775	4,662
60 to 89 Days Past Due | Home equity
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 to 89 days past due	1,630	1,889
60 to 89 Days Past Due | Residential real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 to 89 days past due	936	2,166
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	5,646	6,624
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	17,514	3,432
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	100	204
30 to 59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 to 89 days past due	97,373	109,896
Loans, net of unearned income excluding covered loans, 30-59 days past due and still accruing	95,820	104,122
Covered loans, 30-59 days past due and still accruing	1,553	5,774
30 to 59 Days Past Due | Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 to 89 days past due	17,640	21,476
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	11,779	12,930
30 to 59 Days Past Due | Commercial | Franchise
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 to 89 days past due	493	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	0
30 to 59 Days Past Due | Commercial | Asset-based lending
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 to 89 days past due	1,609	1,844
30 to 59 Days Past Due | Commercial | Leases
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 to 89 days past due	1,331	4,192
30 to 59 Days Past Due | Commercial | PCI - commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 to 89 days past due	2,428	2,510
30 to 59 Days Past Due | Commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 to 89 days past due	31,723	39,243
30 to 59 Days Past Due | Commercial real estate | Construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 to 89 days past due	1,824	1,645
30 to 59 Days Past Due | Commercial real estate | Land
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 to 89 days past due	0	120
30 to 59 Days Past Due | Commercial real estate | Office
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 to 89 days past due	1,232	3,817
30 to 59 Days Past Due | Commercial real estate | Industrial
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 to 89 days past due	2,436	1,009
30 to 59 Days Past Due | Commercial real estate | Retail
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 to 89 days past due	3,364	2,310
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	1,347	6,568
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	12,632	7,215
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	8,888	16,559
30 to 59 Days Past Due | Home equity
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 to 89 days past due	6,515	5,517
30 to 59 Days Past Due | Residential real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 to 89 days past due	8,271	3,903
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	14,580	21,656
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	16,204	11,140
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	$ 887	$ 1,187