Loans (Balances Of Commercial Loan Portfolio Classes, Disaggregated By PD Grade) (Details) $ in Thousands		Jun. 30, 2016 USD ($) number	Mar. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Jun. 30, 2015 USD ($) number	Mar. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses		$ 199,807	$ 204,034	$ 210,242	$ 221,351	$ 228,328	$ 232,448
Total loans collectively evaluated for impairment		18,248,021			16,559,020
Total loans individually evaluated for impairment		319,322			347,901
Allowance - collectively evaluated for impairment		146,829			145,587
Allowance - individually evaluated for impairment		52,151			72,980
Allowance - purchased credit impaired loans		827			2,784
Purchase credit impaired loans - recorded investment		21,994			29,851
General C I [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans collectively evaluated for impairment		8,585,754			7,666,733
Total loans individually evaluated for impairment		48,173			42,951
Total commercial loans		8,644,473			7,714,731
Purchase credit impaired loans - recorded investment		10,546			5,047
Loans To Mortgage Companies [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans collectively evaluated for impairment		2,227,171			1,799,665
Total loans individually evaluated for impairment		0			0
Total commercial loans		2,227,171			1,799,665
Purchase credit impaired loans - recorded investment		0			0
TRUPs [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans collectively evaluated for impairment	[1]	304,527			305,382
Total loans individually evaluated for impairment	[1]	3,274			12,785
Total commercial loans	[1]	307,801			318,167
LOCOM valuation allowance		$ 25,500			$ 26,200
Highest internal grade | number		13			13
Purchase credit impaired loans - recorded investment	[1]	$ 0			$ 0
Income C R E [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans collectively evaluated for impairment		1,886,266			1,348,127
Total loans individually evaluated for impairment		6,922			10,975
Total commercial loans		1,902,387			1,379,714
Purchase credit impaired loans - recorded investment		9,199			20,612
Residential C R E [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans collectively evaluated for impairment		65,040			17,719
Total loans individually evaluated for impairment		1,376			1,518
Total commercial loans		67,025			21,001
Purchase credit impaired loans - recorded investment		$ 609			$ 1,764
Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percent of total commercial loans		100.00%			100.00%
Allowance for loan losses		$ 111,236			$ 100,242
Total loans collectively evaluated for impairment		13,068,758			11,137,626
Total loans individually evaluated for impairment		59,745			68,229
Total commercial loans		13,148,857			11,233,278
Allowance - collectively evaluated for impairment		106,235			84,389
Allowance - individually evaluated for impairment		4,510			13,562
Allowance - purchased credit impaired loans		$ 491			$ 2,291
Percent of loan collectively evaluated for impairment		99.00%			99.00%
Percent of loan individually evaluated for impairment		1.00%			1.00%
Purchase credit impaired loans - recorded investment		$ 20,354			$ 27,423
Percent of loan purchased-credit impaired		0.00%			0.00%
Commercial Loan P D Grade One [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loan, Disaggregated by PD grade		$ 539,335			$ 496,409
Percent of total commercial loans		4.00%			4.00%
Allowance for loan losses		$ 109			$ 126
Commercial Loan P D Grade One [Member] | General C I [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loan, Disaggregated by PD grade		538,386			495,855
Commercial Loan P D Grade One [Member] | Loans To Mortgage Companies [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loan, Disaggregated by PD grade		0			0
Commercial Loan P D Grade One [Member] | TRUPs [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loan, Disaggregated by PD grade	[1]	0			0
Commercial Loan P D Grade One [Member] | Income C R E [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loan, Disaggregated by PD grade		949			554
Commercial Loan P D Grade One [Member] | Residential C R E [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loan, Disaggregated by PD grade		0			0
Commercial Loan P D Grade Two [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loan, Disaggregated by PD grade		$ 719,918			$ 601,971
Percent of total commercial loans		5.00%			5.00%
Allowance for loan losses		$ 389			$ 332
Commercial Loan P D Grade Two [Member] | General C I [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loan, Disaggregated by PD grade		709,997			590,328
Commercial Loan P D Grade Two [Member] | Loans To Mortgage Companies [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loan, Disaggregated by PD grade		0			0
Commercial Loan P D Grade Two [Member] | TRUPs [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loan, Disaggregated by PD grade	[1]	0			0
Commercial Loan P D Grade Two [Member] | Income C R E [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loan, Disaggregated by PD grade		9,806			11,602
Commercial Loan P D Grade Two [Member] | Residential C R E [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loan, Disaggregated by PD grade		115			41
Commercial Loan P D Grade Three [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loan, Disaggregated by PD grade		$ 1,022,337			$ 886,287
Percent of total commercial loans		8.00%			8.00%
Allowance for loan losses		$ 261			$ 350
Commercial Loan P D Grade Three [Member] | General C I [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loan, Disaggregated by PD grade		425,912			484,072
Commercial Loan P D Grade Three [Member] | Loans To Mortgage Companies [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loan, Disaggregated by PD grade		436,545			317,856
Commercial Loan P D Grade Three [Member] | TRUPs [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loan, Disaggregated by PD grade	[1]	0			0
Commercial Loan P D Grade Three [Member] | Income C R E [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loan, Disaggregated by PD grade		159,880			84,178
Commercial Loan P D Grade Three [Member] | Residential C R E [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loan, Disaggregated by PD grade		0			181
Commercial Loan P D Grade Four [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loan, Disaggregated by PD grade		$ 1,627,517			$ 1,134,506
Percent of total commercial loans		12.00%			10.00%
Allowance for loan losses		$ 1,076			$ 868
Commercial Loan P D Grade Four [Member] | General C I [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loan, Disaggregated by PD grade		985,360			670,972
Commercial Loan P D Grade Four [Member] | Loans To Mortgage Companies [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loan, Disaggregated by PD grade		422,844			366,791
Commercial Loan P D Grade Four [Member] | TRUPs [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loan, Disaggregated by PD grade	[1]	0			0
Commercial Loan P D Grade Four [Member] | Income C R E [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loan, Disaggregated by PD grade		219,102			96,689
Commercial Loan P D Grade Four [Member] | Residential C R E [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loan, Disaggregated by PD grade		211			54
Commercial Loan P D Grade Five [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loan, Disaggregated by PD grade		$ 1,604,205			$ 1,658,774
Percent of total commercial loans		12.00%			15.00%
Allowance for loan losses		$ 6,203			$ 6,372
Commercial Loan P D Grade Five [Member] | General C I [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loan, Disaggregated by PD grade		1,094,829			1,135,773
Commercial Loan P D Grade Five [Member] | Loans To Mortgage Companies [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loan, Disaggregated by PD grade		248,926			304,500
Commercial Loan P D Grade Five [Member] | TRUPs [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loan, Disaggregated by PD grade	[1]	0			0
Commercial Loan P D Grade Five [Member] | Income C R E [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loan, Disaggregated by PD grade		259,861			213,213
Commercial Loan P D Grade Five [Member] | Residential C R E [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loan, Disaggregated by PD grade		589			5,288
Commercial Loan P D Grade Six [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loan, Disaggregated by PD grade		$ 2,306,930			$ 2,114,331
Percent of total commercial loans		18.00%			20.00%
Allowance for loan losses		$ 9,654			$ 10,234
Commercial Loan P D Grade Six [Member] | General C I [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loan, Disaggregated by PD grade		1,156,675			1,223,233
Commercial Loan P D Grade Six [Member] | Loans To Mortgage Companies [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loan, Disaggregated by PD grade		837,453			618,616
Commercial Loan P D Grade Six [Member] | TRUPs [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loan, Disaggregated by PD grade	[1]	0			0
Commercial Loan P D Grade Six [Member] | Income C R E [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loan, Disaggregated by PD grade		290,774			267,983
Commercial Loan P D Grade Six [Member] | Residential C R E [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loan, Disaggregated by PD grade		22,028			4,499
Commercial Loan P D Grade Seven [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loan, Disaggregated by PD grade		$ 2,016,958			$ 1,694,381
Percent of total commercial loans		15.00%			15.00%
Allowance for loan losses		$ 14,307			$ 13,203
Commercial Loan P D Grade Seven [Member] | General C I [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loan, Disaggregated by PD grade		1,399,125			1,186,480
Commercial Loan P D Grade Seven [Member] | Loans To Mortgage Companies [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loan, Disaggregated by PD grade		172,039			139,217
Commercial Loan P D Grade Seven [Member] | TRUPs [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loan, Disaggregated by PD grade	[1]	0			0
Commercial Loan P D Grade Seven [Member] | Income C R E [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loan, Disaggregated by PD grade		437,637			365,840
Commercial Loan P D Grade Seven [Member] | Residential C R E [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loan, Disaggregated by PD grade		8,157			2,844
Commercial Loan P D Grade Eight [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loan, Disaggregated by PD grade		$ 1,158,931			$ 941,748
Percent of total commercial loans		9.00%			8.00%
Allowance for loan losses		$ 20,979			$ 13,942
Commercial Loan P D Grade Eight [Member] | General C I [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loan, Disaggregated by PD grade		803,708			749,504
Commercial Loan P D Grade Eight [Member] | Loans To Mortgage Companies [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loan, Disaggregated by PD grade		46,947			28,068
Commercial Loan P D Grade Eight [Member] | TRUPs [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loan, Disaggregated by PD grade	[1]	0			0
Commercial Loan P D Grade Eight [Member] | Income C R E [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loan, Disaggregated by PD grade		303,946			163,904
Commercial Loan P D Grade Eight [Member] | Residential C R E [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loan, Disaggregated by PD grade		4,330			272
Commercial Loan P D Grade Nine [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loan, Disaggregated by PD grade		$ 658,111			$ 488,439
Percent of total commercial loans		5.00%			4.00%
Allowance for loan losses		$ 12,885			$ 7,900
Commercial Loan P D Grade Nine [Member] | General C I [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loan, Disaggregated by PD grade		564,474			419,687
Commercial Loan P D Grade Nine [Member] | Loans To Mortgage Companies [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loan, Disaggregated by PD grade		6,661			24,617
Commercial Loan P D Grade Nine [Member] | TRUPs [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loan, Disaggregated by PD grade	[1]	0			0
Commercial Loan P D Grade Nine [Member] | Income C R E [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loan, Disaggregated by PD grade		82,351			43,752
Commercial Loan P D Grade Nine [Member] | Residential C R E [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loan, Disaggregated by PD grade		4,625			383
Commercial Loan P D Grade Ten [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loan, Disaggregated by PD grade		$ 372,042			$ 250,841
Percent of total commercial loans		3.00%			2.00%
Allowance for loan losses		$ 5,637			$ 5,147
Commercial Loan P D Grade Ten [Member] | General C I [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loan, Disaggregated by PD grade		258,486			222,799
Commercial Loan P D Grade Ten [Member] | Loans To Mortgage Companies [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loan, Disaggregated by PD grade		38,285			0
Commercial Loan P D Grade Ten [Member] | TRUPs [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loan, Disaggregated by PD grade	[1]	0			0
Commercial Loan P D Grade Ten [Member] | Income C R E [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loan, Disaggregated by PD grade		61,260			27,840
Commercial Loan P D Grade Ten [Member] | Residential C R E [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loan, Disaggregated by PD grade		14,011			202
Commercial Loan P D Grade Eleven [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loan, Disaggregated by PD grade		$ 264,983			$ 204,220
Percent of total commercial loans		2.00%			2.00%
Allowance for loan losses		$ 6,971			$ 5,438
Commercial Loan P D Grade Eleven [Member] | General C I [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loan, Disaggregated by PD grade		222,391			179,139
Commercial Loan P D Grade Eleven [Member] | Loans To Mortgage Companies [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loan, Disaggregated by PD grade		17,390			0
Commercial Loan P D Grade Eleven [Member] | TRUPs [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loan, Disaggregated by PD grade	[1]	0			0
Commercial Loan P D Grade Eleven [Member] | Income C R E [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loan, Disaggregated by PD grade		20,364			24,010
Commercial Loan P D Grade Eleven [Member] | Residential C R E [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loan, Disaggregated by PD grade		4,838			1,071
Commercial Loan P D Grade Twelve [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loan, Disaggregated by PD grade		$ 130,873			$ 94,636
Percent of total commercial loans		1.00%			1.00%
Allowance for loan losses		$ 4,337			$ 2,704
Commercial Loan P D Grade Twelve [Member] | General C I [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loan, Disaggregated by PD grade		111,980			76,209
Commercial Loan P D Grade Twelve [Member] | Loans To Mortgage Companies [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loan, Disaggregated by PD grade		0			0
Commercial Loan P D Grade Twelve [Member] | TRUPs [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loan, Disaggregated by PD grade	[1]	0			0
Commercial Loan P D Grade Twelve [Member] | Income C R E [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loan, Disaggregated by PD grade		14,530			17,884
Commercial Loan P D Grade Twelve [Member] | Residential C R E [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loan, Disaggregated by PD grade		4,363			543
Commercial Loan P D Grade Thirteen [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loan, Disaggregated by PD grade		$ 469,294			$ 432,164
Percent of total commercial loans		4.00%			4.00%
Allowance for loan losses		$ 5,669			$ 4,944
Commercial Loan P D Grade Thirteen [Member] | General C I [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loan, Disaggregated by PD grade		157,028			122,862
Commercial Loan P D Grade Thirteen [Member] | Loans To Mortgage Companies [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loan, Disaggregated by PD grade		0			0
Commercial Loan P D Grade Thirteen [Member] | TRUPs [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loan, Disaggregated by PD grade	[1]	304,527			305,382
Commercial Loan P D Grade Thirteen [Member] | Income C R E [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loan, Disaggregated by PD grade		7,437			3,633
Commercial Loan P D Grade Thirteen [Member] | Residential C R E [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loan, Disaggregated by PD grade		302			287
Commercial Loan P D Grade Fourteen Fifteen Sixteen [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loan, Disaggregated by PD grade		$ 177,324			$ 138,919
Percent of total commercial loans		1.00%			1.00%
Allowance for loan losses		$ 17,758			$ 12,829
Commercial Loan P D Grade Fourteen Fifteen Sixteen [Member] | General C I [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loan, Disaggregated by PD grade		157,403			109,820
Commercial Loan P D Grade Fourteen Fifteen Sixteen [Member] | Loans To Mortgage Companies [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loan, Disaggregated by PD grade		81			0
Commercial Loan P D Grade Fourteen Fifteen Sixteen [Member] | TRUPs [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loan, Disaggregated by PD grade	[1]	0			0
Commercial Loan P D Grade Fourteen Fifteen Sixteen [Member] | Income C R E [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loan, Disaggregated by PD grade		18,369			27,045
Commercial Loan P D Grade Fourteen Fifteen Sixteen [Member] | Residential C R E [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loan, Disaggregated by PD grade		$ 1,471			$ 2,054

[1] Balances as of June 30 , 2016 and 2015 , presented net of $ 25.5 million and $ 26.2 million, respectively, in lower of cost or market (“LOCOM”) valuation adjustment . Based on the underlying structure of the notes , the highest possible internal grade is " 13 ".