Business Segments (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Segment Reporting Information [Line Items]
Total interest income	$ 85,940	$ 87,908	$ 172,118	$ 179,214
Interest expense	(10,377)	(14,596)	(21,937)	(30,927)
Net interest income	75,563	73,312	150,181	148,287
Provision for Loan and Lease Losses, net	(26,536)	(14,445)	(44,190)	(28,234)
Total non-interest income (loss), net	24,886	15,155	43,960	28,658
Non-interest expenses	(52,816)	(53,825)	(104,500)	(108,682)
Intersegment revenues	0	0	0	0
Intersegment expenses	0	0	0	0
Income (loss) before Income Taxes, Parent	21,097	20,197	45,451	40,029
Total assets	6,235,826		6,235,826		$ 6,501,824
Banking [Member]
Segment Reporting Information [Line Items]
Total interest income	77,019	79,675	154,592	160,827
Interest expense	(6,820)	(7,300)	(13,634)	(14,107)
Net interest income	70,199	72,375	140,958	146,720
Provision for Loan and Lease Losses, net	(26,526)	(14,445)	(44,168)	(28,234)
Total non-interest income (loss), net	11,776	8,214	25,003	16,009
Non-interest expenses	(47,402)	(47,097)	(93,456)	(97,786)
Intersegment revenues	346	389	810	787
Intersegment expenses	(71)	(49)	(142)	(149)
Income (loss) before Income Taxes, Parent	8,322	19,387	29,005	37,347
Total assets	5,490,287	5,829,987	5,490,287	5,829,987
Financial Services
Segment Reporting Information [Line Items]
Total interest income	18	16	30	34
Interest expense	0	0	0	0
Net interest income	18	16	30	34
Provision for Loan and Lease Losses, net	0	0	0	0
Total non-interest income (loss), net	6,329	6,910	12,257	12,930
Non-interest expenses	(4,100)	(4,908)	(8,320)	(7,853)
Intersegment revenues	0	0	0	0
Intersegment expenses	(254)	(286)	(565)	(577)
Income (loss) before Income Taxes, Parent	1,993	1,732	3,402	4,534
Total assets	22,531	19,054	22,531	19,054
Treasury [Member]
Segment Reporting Information [Line Items]
Total interest income	8,903	8,217	17,496	18,353
Interest expense	(3,557)	(7,296)	(8,303)	(16,820)
Net interest income	5,346	921	9,193	1,533
Provision for Loan and Lease Losses, net	(10)	0	(22)	0
Total non-interest income (loss), net	6,781	31	6,700	(281)
Non-interest expenses	(1,314)	(1,820)	(2,724)	(3,043)
Intersegment revenues	71	49	142	149
Intersegment expenses	(92)	(103)	(245)	(210)
Income (loss) before Income Taxes, Parent	10,782	(922)	13,044	(1,852)
Total assets	1,692,603	1,800,838	1,692,603	1,800,838
Major Segment [Member]
Segment Reporting Information [Line Items]
Total interest income	85,940	87,908	172,118	179,214
Interest expense	(10,377)	(14,596)	(21,937)	(30,927)
Net interest income	75,563	73,312	150,181	148,287
Provision for Loan and Lease Losses, net	(26,536)	(14,445)	(44,190)	(28,234)
Total non-interest income (loss), net	24,886	15,155	43,960	28,658
Non-interest expenses	(52,816)	(53,825)	(104,500)	(108,682)
Intersegment revenues	417	438	952	936
Intersegment expenses	(417)	(438)	(952)	(936)
Income (loss) before Income Taxes, Parent	21,097	20,197	45,451	40,029
Total assets	7,205,421	7,649,879	7,205,421	7,649,879
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	(417)	(438)	(952)	(936)
Intersegment expenses	417	438	952	936
Income (loss) before Income Taxes, Parent	0	0	0	0
Total assets	(969,595)	(937,283)	(969,595)	(937,283)
Consolidated Total [Member]
Segment Reporting Information [Line Items]
Total interest income	85,940	87,908	172,118	179,214
Interest expense	(10,377)	(14,596)	(21,937)	(30,927)
Net interest income	75,563	73,312	150,181	148,287
Provision for Loan and Lease Losses, net	(26,536)	(14,445)	(44,190)	(28,234)
Total non-interest income (loss), net	24,886	15,155	43,960	28,658
Non-interest expenses	(52,816)	(53,825)	(104,500)	(108,682)
Intersegment revenues	0	0	0	0
Intersegment expenses	0	0	0	0
Income (loss) before Income Taxes, Parent	21,097	20,197	45,451	40,029
Total assets	$ 6,235,826	$ 6,712,596	$ 6,235,826	$ 6,712,596