Summary of Loan Classes and Aging of Past Due Loans (Detail) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015	Jun. 30, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non- Accrual Loans	$ 58,423	$ 61,152
Total Past Due	91,852	87,778
PCI Loans	2,222	3,056
Current	9,989,192	9,339,927
Total Loans	10,083,266	9,430,761	$ 8,916,128
Real estate - residential [Member] | Prime [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non- Accrual Loans	537	800
Total Past Due	3,746	1,447
Current	474,892	490,780
Total Loans	478,638	492,227
Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	395,216		380,938
Leases [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	36,577	41,857
Total Loans	36,577	41,857	$ 40,073
30-89 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	28,729	19,302
30-89 Days Past Due [Member] | Real estate - residential [Member] | Prime [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	3,143	612
Greater than 90 days Past Due and Accruing [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	4,700	7,324
Greater than 90 days Past Due and Accruing [Member] | Real estate - residential [Member] | Prime [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	66	35
PCI loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	1,152	1,838
PCI loans | 30-89 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	51	58
PCI loans | Greater than 90 days Past Due and Accruing [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	1,019	1,160
Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non- Accrual Loans	41,828	43,841
Total Past Due	51,374	52,485
Current	4,392,763	4,153,251
Total Loans	4,444,137	4,205,736
Commercial [Member] | 30-89 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	8,753	5,821
Commercial [Member] | Greater than 90 days Past Due and Accruing [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	793	2,823
Commercial - credit card [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non- Accrual Loans	19	13
Total Past Due	698	651
Current	144,661	124,710
Total Loans	145,359	125,361
Commercial - credit card [Member] | 30-89 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	424	614
Commercial - credit card [Member] | Greater than 90 days Past Due and Accruing [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	255	24
Construction [Member] | Real estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non- Accrual Loans	311	331
Total Past Due	789	2,707
Current	530,987	413,861
Total Loans	531,776	416,568
Construction [Member] | 30-89 Days Past Due [Member] | Real estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	478	1,828
Construction [Member] | Greater than 90 days Past Due and Accruing [Member] | Real estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due		548
Real estate - commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non- Accrual Loans	9,375	9,578
Total Past Due	14,125	13,333
PCI Loans	992	1,055
Current	2,970,077	2,648,384
Total Loans	2,985,194	2,662,772
Real estate - commercial [Member] | 30-89 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	4,750	2,125
Real estate - commercial [Member] | Greater than 90 days Past Due and Accruing [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due		1,630
Real estate - commercial [Member] | PCI loans | Greater than 90 days Past Due and Accruing [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	992	1,055
Real estate - HELOC [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non- Accrual Loans	3,389	3,524
Total Past Due	4,478	3,653
Current	737,225	726,310
Total Loans	741,703	729,963
Real estate - HELOC [Member] | 30-89 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	1,089	129
Credit card [Member] | Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non- Accrual Loans	313	468
Total Past Due	4,353	4,813
Current	266,000	286,757
Total Loans	270,353	291,570
Credit card [Member] | 30-89 Days Past Due [Member] | Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	2,079	2,256
Credit card [Member] | Greater than 90 days Past Due and Accruing [Member] | Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	1,961	2,089
Other [Member] | Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non- Accrual Loans	2,651	2,597
Total Past Due	12,289	8,689
PCI Loans	1,230	2,001
Current	111,344	144,087
Total Loans	124,863	154,777
Other [Member] | 30-89 Days Past Due [Member] | Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	8,013	5,917
Other [Member] | Greater than 90 days Past Due and Accruing [Member] | Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	1,625	175
Other [Member] | PCI loans | Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	1,152	1,838
Other [Member] | PCI loans | 30-89 Days Past Due [Member] | Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	51	58
Other [Member] | PCI loans | Greater than 90 days Past Due and Accruing [Member] | Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	27	105
Asset-based [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	223,339	219,244
Total Loans	223,339	219,244
Factoring [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	101,327	90,686
Total Loans	$ 101,327	$ 90,686