Loans and Leases (Details 5) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with Related Allowance, Related Allowance		$ 14,245
Total Impaired Loans and Leases		163,898		$ 212,622	[1]
Impaired Financing Receivable, Unpaid Principal Balance		263,256
Real Estate Mortgage
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with Related Allowance, Related Allowance		1,088
Total Impaired Loans and Leases		75,372
Impaired Financing Receivable, Unpaid Principal Balance		93,573
Real Estate Construction and Land
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with Related Allowance, Related Allowance		0
Total Impaired Loans and Leases		5,670
Impaired Financing Receivable, Unpaid Principal Balance		5,670
Commercial
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with Related Allowance, Related Allowance		13,141
Total Impaired Loans and Leases		82,482
Impaired Financing Receivable, Unpaid Principal Balance		163,479
Consumer
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment		295
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance		355
Impaired Financing Receivable, with Related Allowance, Related Allowance		16
Impaired Financing Receivable, with No Related Allowance, Recorded Investment		79
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance		179
Total Impaired Loans and Leases		374
Impaired Financing Receivable, Unpaid Principal Balance		534
Non Purchased Credit Impaired Loans and Leases
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with Related Allowance, Related Allowance	[2]			13,621
Total Impaired Loans and Leases	[2]			212,622
Impaired Financing Receivable, Unpaid Principal Balance	[2]			287,236
Impaired Financing Receivable, Average Recorded Investment	[3]	156,089	$ 209,761
Impaired Financing Receivable, Interest Income, Accrual Method		2,287	909
Non Purchased Credit Impaired Loans and Leases | Real Estate Mortgage
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with Related Allowance, Related Allowance	[2]			970
Total Impaired Loans and Leases	[1],[2]			116,473
Impaired Financing Receivable, Unpaid Principal Balance	[2]			129,909
Impaired Financing Receivable, Average Recorded Investment	[3]	73,425	115,820
Impaired Financing Receivable, Interest Income, Accrual Method		1,034	793
Non Purchased Credit Impaired Loans and Leases | Real Estate Construction and Land
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with Related Allowance, Related Allowance	[2]			0
Total Impaired Loans and Leases	[1],[2]			5,690
Impaired Financing Receivable, Unpaid Principal Balance	[2]			5,689
Impaired Financing Receivable, Average Recorded Investment	[3]	5,670	6,683
Impaired Financing Receivable, Interest Income, Accrual Method		89	69
Non Purchased Credit Impaired Loans and Leases | Commercial
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with Related Allowance, Related Allowance	[2]			12,635
Total Impaired Loans and Leases	[1],[2]			90,339
Impaired Financing Receivable, Unpaid Principal Balance	[2]			151,445
Impaired Financing Receivable, Average Recorded Investment	[3]	76,620	86,944
Impaired Financing Receivable, Interest Income, Accrual Method		1,162	45
Non Purchased Credit Impaired Loans and Leases | Consumer
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	[2]			100
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	[2]			100
Impaired Financing Receivable, with Related Allowance, Related Allowance	[2]			16
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	[2]			20
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	[2]			93
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	[3]	295	187
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method		2	0
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	[3]	79	127
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method		0	2
Total Impaired Loans and Leases	[1],[2]			120
Impaired Financing Receivable, Unpaid Principal Balance	[2]			193
Impaired Financing Receivable, Average Recorded Investment	[3]	374	314
Impaired Financing Receivable, Interest Income, Accrual Method		2	2
Asset Based | Commercial
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Recorded Investment		32,838
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance		55,890
Asset Based | Non Purchased Credit Impaired Loans and Leases | Commercial
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	[2]			33,553
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	[2]			54,911
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	[3]	32,838	30,739
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method		0	0
Venture Capital Loans | Commercial
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment		17,367
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance		18,312
Impaired Financing Receivable, with Related Allowance, Related Allowance		4,970
Impaired Financing Receivable, with No Related Allowance, Recorded Investment		6,129
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance		29,786
Venture Capital Loans | Non Purchased Credit Impaired Loans and Leases | Commercial
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	[2]			16,565
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	[2]			17,203
Impaired Financing Receivable, with Related Allowance, Related Allowance	[2]			4,267
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	[2]			14,534
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	[2]			40,029
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	[3]	14,598	4,693
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method		0	0
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	[3]	4,474	2,429
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method		0	0
Other Commercial | Commercial
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment		18,048
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance		31,672
Impaired Financing Receivable, with Related Allowance, Related Allowance		8,171
Impaired Financing Receivable, with No Related Allowance, Recorded Investment		8,100
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance		27,819
Other Commercial | Non Purchased Credit Impaired Loans and Leases | Commercial
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	[2]			20,404
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	[2]			29,951
Impaired Financing Receivable, with Related Allowance, Related Allowance	[2]			8,368
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	[2]			5,283
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	[2]			9,351
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	[3]	16,851	44,333
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method		15	15
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	[3]	7,859	4,750
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method		1,147	30
Commercial Real Estate Construction Loan Receivable | Real Estate Construction and Land
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Recorded Investment		5,670
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance		5,670
Commercial Real Estate Construction Loan Receivable | Non Purchased Credit Impaired Loans and Leases | Real Estate Construction and Land
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	[2]			5,690
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	[2]			5,689
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	[3]	5,670	6,111
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method		89	67
Residential Real Estate Construction Financing Receivable | Non Purchased Credit Impaired Loans and Leases | Real Estate Construction and Land
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment		0	572
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method		0	2
Commercial real estate | Real Estate Mortgage
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment		13,884
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance		14,690
Impaired Financing Receivable, with Related Allowance, Related Allowance		576
Impaired Financing Receivable, with No Related Allowance, Recorded Investment		48,729
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance		63,283
Commercial real estate | Non Purchased Credit Impaired Loans and Leases | Real Estate Mortgage
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	[2]			15,750
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	[2]			16,548
Impaired Financing Receivable, with Related Allowance, Related Allowance	[2]			628
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	[2]			93,827
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	[2]			105,923
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	[3]	13,884	14,350
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method		201	206
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	[3]	46,782	92,753
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method		765	560
Residential Real Estate | Real Estate Mortgage
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment		4,295
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance		4,926
Impaired Financing Receivable, with Related Allowance, Related Allowance		512
Impaired Financing Receivable, with No Related Allowance, Recorded Investment		8,464
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance		10,674
Residential Real Estate | Non Purchased Credit Impaired Loans and Leases | Real Estate Mortgage
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	[2]			2,787
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	[2]			2,957
Impaired Financing Receivable, with Related Allowance, Related Allowance	[2]			342
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	[2]			4,109
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	[2]			$ 4,481
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	[3]	4,295	3,501
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method		23	12
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	[3]	8,464	5,216
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method		$ 45	$ 15

[1] Excludes loans held for sale carried at lower of cost or fair value and PCI loans.

[2] Excludes loans held for sale carried at lower of cost or fair value and PCI loans.

[3] For loans and leases reported as impaired at March 31, 2018 and 2017, amounts were calculated based on the period of time such loans and leases were impaired during the reported period.