Business Segments (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Segment Reporting Information [Line Items]
Total interest income	$ 87,908	$ 99,413	$ 179,214	$ 206,414
Interest expense	(14,596)	(17,121)	(30,927)	(34,487)
Net interest income	73,312	82,292	148,287	171,927
Provision for Loan and Lease Losses, net	(14,445)	(15,539)	(28,234)	(57,732)
Total non-interest income (loss), net	15,155	(4,656)	28,658	2,225
Non-interest expenses	(53,825)	(64,437)	(108,682)	(120,769)
Intersegment revenues	0	0	0	0
Intersegment expenses	0	0	0	0
Income (loss) before Income Taxes, Parent	20,197	(2,340)	40,029	(4,349)
Total assets	6,712,596		6,712,596		$ 7,099,149
Banking [Member]
Segment Reporting Information [Line Items]
Total interest income	79,675	90,504	160,827	187,986
Interest expense	(7,300)	(7,110)	(14,107)	(14,564)
Net interest income	72,375	83,394	146,720	173,422
Provision for Loan and Lease Losses, net	(14,445)	(15,539)	(28,234)	(57,732)
Total non-interest income (loss), net	8,214	(11,713)	16,009	(13,962)
Non-interest expenses	(47,098)	(56,844)	(97,786)	(106,156)
Intersegment revenues	389	163	787	707
Intersegment expenses	(49)	(61)	(149)	(159)
Income (loss) before Income Taxes, Parent	19,386	(600)	37,347	(3,880)
Total assets	5,829,987	6,153,663	5,829,987	6,153,663
Financial Services
Segment Reporting Information [Line Items]
Total interest income	16	24	34	47
Interest expense	0	0	0	0
Net interest income	16	24	34	47
Provision for Loan and Lease Losses, net	0	0	0	0
Total non-interest income (loss), net	6,910	6,893	12,930	13,903
Non-interest expenses	(4,908)	(6,733)	(7,853)	(11,524)
Intersegment revenues	0	0	0	0
Intersegment expenses	(286)	(87)	(577)	(518)
Income (loss) before Income Taxes, Parent	1,732	97	4,534	1,908
Total assets	19,054	21,157	19,054	21,157
Treasury [Member]
Segment Reporting Information [Line Items]
Total interest income	8,217	8,885	18,353	18,381
Interest expense	(7,296)	(10,011)	(16,820)	(19,923)
Net interest income	921	(1,126)	1,533	(1,542)
Provision for Loan and Lease Losses, net	0	0	0	0
Total non-interest income (loss), net	31	164	(281)	2,284
Non-interest expenses	(1,820)	(860)	(3,043)	(3,089)
Intersegment revenues	49	61	149	160
Intersegment expenses	(103)	(76)	(210)	(189)
Income (loss) before Income Taxes, Parent	(922)	(1,837)	(1,852)	(2,376)
Total assets	1,800,838	2,136,293	1,800,838	2,136,293
Major Segment [Member]
Segment Reporting Information [Line Items]
Total interest income	87,908	99,413	179,214	206,414
Interest expense	(14,596)	(17,121)	(30,927)	(34,487)
Net interest income	73,312	82,292	148,287	171,927
Provision for Loan and Lease Losses, net	(14,445)	(15,539)	(28,234)	(57,732)
Total non-interest income (loss), net	15,155	(4,656)	28,658	2,225
Non-interest expenses	(53,826)	(64,437)	(108,682)	(120,769)
Intersegment revenues	438	224	936	866
Intersegment expenses	(438)	(224)	(936)	(866)
Income (loss) before Income Taxes, Parent	20,196	(2,340)	40,029	(4,349)
Total assets	7,649,879	8,311,113	7,649,879	8,311,113
Intersegment Elimination [Member]
Segment Reporting Information [Line Items]
Total interest income	0	0	0	0
Interest expense	0	0	0	0
Net interest income	0	0	0	0
Provision for Loan and Lease Losses, net	0	0	0	0
Total non-interest income (loss), net	0	0	0	0
Non-interest expenses	0	0	0	0
Intersegment revenues	(438)	(224)	(936)	(866)
Intersegment expenses	438	224	936	866
Income (loss) before Income Taxes, Parent	0	0	0	0
Total assets	(937,283)	(912,788)	(937,283)	(912,788)
Consolidated Total [Member]
Segment Reporting Information [Line Items]
Total interest income		99,413	179,214	206,414
Interest expense		(17,121)	(30,927)	(34,487)
Net interest income		82,292	148,287	171,927
Provision for Loan and Lease Losses, net		(15,539)	(28,234)	(57,732)
Total non-interest income (loss), net		(4,656)	28,658	2,225
Non-interest expenses		(64,437)	(108,682)	(120,769)
Intersegment revenues		0	0	0
Intersegment expenses		0	0	0
Income (loss) before Income Taxes, Parent		(2,340)	40,029	(4,349)
Total assets	$ 6,712,596	$ 7,398,325	$ 6,712,596	$ 7,398,325

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Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Costs of sales and operating expenses for the period incurred from transactions with related parties.

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This element represents the income or loss from continuing operations attributable to the economic entity which may also be defined as revenue less expenses from ongoing operations, after income or loss from equity method investments, but before income taxes, extraordinary items, and noncontrolling interest.

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Represents the total of interest and dividend income, including any amortization and accretion (as applicable) of discounts and premiums, earned from (1) loans and leases whether held-for-sale or held-in-portfolio; (2) investment securities; (3) federal funds sold; (4) securities purchased under agreements to resell; (5) investments in banker's acceptances, commercial paper, or certificates of deposit; (6) dividend income; or (7) other investments not otherwise specified herein.

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Amount of the cost of borrowed funds accounted for as interest expense.

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The net amount of operating interest income (expense).

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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