Loans (Balances Of Commercial Loan Portfolio Classes, Disaggregated By PD Grade) (Details) $ in Thousands		Mar. 31, 2017 USD ($) number	Dec. 31, 2016 USD ($) number	Mar. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses		$ 201,968	$ 202,068	$ 204,034	$ 210,242
Total loans collectively evaluated for impairment		18,762,625		17,231,978
Total loans individually evaluated for impairment		283,550		312,762
Allowance - collectively evaluated for impairment		157,056		145,010
Allowance - individually evaluated for impairment		44,322		57,876
Allowance - purchased credit impaired loans		590	$ 700	1,148
Purchase credit impaired loans - recorded investment		$ 43,899		$ 30,254
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		$ 123,995	$ 123,250
Total loans collectively evaluated for impairment		13,786,817	14,187,074
Total loans individually evaluated for impairment		48,066	51,086
Total commercial loans		13,877,307	14,283,610
Allowance - collectively evaluated for impairment		119,788	118,518
Allowance - individually evaluated for impairment		3,967	4,413
Allowance - purchased credit impaired loans		$ 240	$ 319
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		$ 42,424	$ 45,450
Percent of loan purchased-credit impaired		0.00%	0.00%
General C I [Member] | Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans collectively evaluated for impairment		$ 9,787,530	$ 9,710,168
Total loans individually evaluated for impairment		41,787	44,753
Total commercial loans		9,867,595	9,795,453
Purchase credit impaired loans - recorded investment		38,278	40,532
Loans To Mortgage Companies [Member] | Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans collectively evaluated for impairment		1,528,982	2,045,189
Total loans individually evaluated for impairment		0	0
Total commercial loans		1,528,982	2,045,189
Purchase credit impaired loans - recorded investment		0	0
TRUPs [Member] | Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans collectively evaluated for impairment	[1]	304,236	304,236
Total loans individually evaluated for impairment	[1]	3,183	3,209
Total commercial loans	[1]	307,419	307,445
Valuation allowance		$ 25,500	$ 25,500
Highest internal grade | number		13	13
Purchase credit impaired loans - recorded investment	[1]	$ 0	$ 0
Income C R E [Member] | Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans collectively evaluated for impairment		2,128,036	2,085,619
Total loans individually evaluated for impairment		1,803	1,831
Total commercial loans		2,133,891	2,092,033
Purchase credit impaired loans - recorded investment		4,052	4,583
Residential C R E [Member] | Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans collectively evaluated for impairment		38,033	41,862
Total loans individually evaluated for impairment		1,293	1,293
Total commercial loans		39,420	43,490
Purchase credit impaired loans - recorded investment		94	335
Commercial Loan P D Grade One [Member] | Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loan, Disaggregated by PD grade		$ 478,635	$ 466,257
Percent of total commercial loans		3.00%	3.00%
Allowance for loan losses		$ 78	$ 77
Commercial Loan P D Grade One [Member] | General C I [Member] | Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loan, Disaggregated by PD grade		478,025	465,179
Commercial Loan P D Grade One [Member] | Loans To Mortgage Companies [Member] | Commercial Portfolio Segment [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] | Commercial Portfolio Segment [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] | Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loan, Disaggregated by PD grade		610	1,078
Commercial Loan P D Grade One [Member] | Residential C R E [Member] | Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loan, Disaggregated by PD grade		0	0
Commercial Loan P D Grade Two [Member] | Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loan, Disaggregated by PD grade		$ 902,824	$ 803,012
Percent of total commercial loans		7.00%	6.00%
Allowance for loan losses		$ 442	$ 403
Commercial Loan P D Grade Two [Member] | General C I [Member] | Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loan, Disaggregated by PD grade		891,450	791,183
Commercial Loan P D Grade Two [Member] | Loans To Mortgage Companies [Member] | Commercial Portfolio Segment [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] | Commercial Portfolio Segment [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] | Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loan, Disaggregated by PD grade		11,293	11,742
Commercial Loan P D Grade Two [Member] | Residential C R E [Member] | Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loan, Disaggregated by PD grade		81	87
Commercial Loan P D Grade Three [Member] | Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loan, Disaggregated by PD grade		$ 962,378	$ 1,107,542
Percent of total commercial loans		7.00%	8.00%
Allowance for loan losses		$ 239	$ 304
Commercial Loan P D Grade Three [Member] | General C I [Member] | Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loan, Disaggregated by PD grade		403,403	491,386
Commercial Loan P D Grade Three [Member] | Loans To Mortgage Companies [Member] | Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loan, Disaggregated by PD grade		398,860	462,486
Commercial Loan P D Grade Three [Member] | TRUPs [Member] | Commercial Portfolio Segment [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] | Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loan, Disaggregated by PD grade		160,115	153,670
Commercial Loan P D Grade Three [Member] | Residential C R E [Member] | Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loan, Disaggregated by PD grade		0	0
Commercial Loan P D Grade Four [Member] | Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loan, Disaggregated by PD grade		$ 1,467,562	$ 1,532,811
Percent of total commercial loans		11.00%	11.00%
Allowance for loan losses		$ 879	$ 953
Commercial Loan P D Grade Four [Member] | General C I [Member] | Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loan, Disaggregated by PD grade		998,015	978,282
Commercial Loan P D Grade Four [Member] | Loans To Mortgage Companies [Member] | Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loan, Disaggregated by PD grade		227,257	332,107
Commercial Loan P D Grade Four [Member] | TRUPs [Member] | Commercial Portfolio Segment [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] | Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loan, Disaggregated by PD grade		242,069	222,422
Commercial Loan P D Grade Four [Member] | Residential C R E [Member] | Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loan, Disaggregated by PD grade		221	0
Commercial Loan P D Grade Five [Member] | Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loan, Disaggregated by PD grade		$ 1,835,298	$ 1,873,965
Percent of total commercial loans		13.00%	13.00%
Allowance for loan losses		$ 7,260	$ 6,670
Commercial Loan P D Grade Five [Member] | General C I [Member] | Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loan, Disaggregated by PD grade		1,269,384	1,232,401
Commercial Loan P D Grade Five [Member] | Loans To Mortgage Companies [Member] | Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loan, Disaggregated by PD grade		139,434	275,209
Commercial Loan P D Grade Five [Member] | TRUPs [Member] | Commercial Portfolio Segment [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] | Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loan, Disaggregated by PD grade		426,147	365,653
Commercial Loan P D Grade Five [Member] | Residential C R E [Member] | Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loan, Disaggregated by PD grade		333	702
Commercial Loan P D Grade Six [Member] | Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loan, Disaggregated by PD grade		$ 2,432,971	$ 2,502,310
Percent of total commercial loans		17.00%	17.00%
Allowance for loan losses		$ 10,600	$ 10,403
Commercial Loan P D Grade Six [Member] | General C I [Member] | Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loan, Disaggregated by PD grade		1,535,573	1,540,519
Commercial Loan P D Grade Six [Member] | Loans To Mortgage Companies [Member] | Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loan, Disaggregated by PD grade		521,253	614,109
Commercial Loan P D Grade Six [Member] | TRUPs [Member] | Commercial Portfolio Segment [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] | Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loan, Disaggregated by PD grade		368,073	338,344
Commercial Loan P D Grade Six [Member] | Residential C R E [Member] | Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loan, Disaggregated by PD grade		8,072	9,338
Commercial Loan P D Grade Seven [Member] | Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loan, Disaggregated by PD grade		$ 2,047,501	$ 2,228,369
Percent of total commercial loans		15.00%	16.00%
Allowance for loan losses		$ 12,767	$ 14,010
Commercial Loan P D Grade Seven [Member] | General C I [Member] | Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loan, Disaggregated by PD grade		1,479,242	1,556,117
Commercial Loan P D Grade Seven [Member] | Loans To Mortgage Companies [Member] | Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loan, Disaggregated by PD grade		169,444	317,283
Commercial Loan P D Grade Seven [Member] | TRUPs [Member] | Commercial Portfolio Segment [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] | Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loan, Disaggregated by PD grade		396,654	352,390
Commercial Loan P D Grade Seven [Member] | Residential C R E [Member] | Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loan, Disaggregated by PD grade		2,161	2,579
Commercial Loan P D Grade Eight [Member] | Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loan, Disaggregated by PD grade		$ 1,449,113	$ 1,422,786
Percent of total commercial loans		10.00%	10.00%
Allowance for loan losses		$ 24,532	$ 25,986
Commercial Loan P D Grade Eight [Member] | General C I [Member] | Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loan, Disaggregated by PD grade		1,042,772	963,359
Commercial Loan P D Grade Eight [Member] | Loans To Mortgage Companies [Member] | Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loan, Disaggregated by PD grade		49,588	30,974
Commercial Loan P D Grade Eight [Member] | TRUPs [Member] | Commercial Portfolio Segment [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] | Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loan, Disaggregated by PD grade		352,370	425,503
Commercial Loan P D Grade Eight [Member] | Residential C R E [Member] | Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loan, Disaggregated by PD grade		4,383	2,950
Commercial Loan P D Grade Nine [Member] | Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loan, Disaggregated by PD grade		$ 732,197	$ 725,767
Percent of total commercial loans		5.00%	5.00%
Allowance for loan losses		$ 14,396	$ 13,857
Commercial Loan P D Grade Nine [Member] | General C I [Member] | Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loan, Disaggregated by PD grade		641,463	611,774
Commercial Loan P D Grade Nine [Member] | Loans To Mortgage Companies [Member] | Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loan, Disaggregated by PD grade		4,643	4,299
Commercial Loan P D Grade Nine [Member] | TRUPs [Member] | Commercial Portfolio Segment [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] | Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loan, Disaggregated by PD grade		82,734	105,277
Commercial Loan P D Grade Nine [Member] | Residential C R E [Member] | Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loan, Disaggregated by PD grade		3,357	4,417
Commercial Loan P D Grade Ten [Member] | Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loan, Disaggregated by PD grade		$ 394,316	$ 423,616
Percent of total commercial loans		3.00%	3.00%
Allowance for loan losses		$ 8,510	$ 8,400
Commercial Loan P D Grade Ten [Member] | General C I [Member] | Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loan, Disaggregated by PD grade		344,633	355,359
Commercial Loan P D Grade Ten [Member] | Loans To Mortgage Companies [Member] | Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loan, Disaggregated by PD grade		4,499	8,663
Commercial Loan P D Grade Ten [Member] | TRUPs [Member] | Commercial Portfolio Segment [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] | Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loan, Disaggregated by PD grade		35,489	50,484
Commercial Loan P D Grade Ten [Member] | Residential C R E [Member] | Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loan, Disaggregated by PD grade		9,695	9,110
Commercial Loan P D Grade Eleven [Member] | Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loan, Disaggregated by PD grade		$ 251,213	$ 265,371
Percent of total commercial loans		2.00%	2.00%
Allowance for loan losses		$ 6,289	$ 6,556
Commercial Loan P D Grade Eleven [Member] | General C I [Member] | Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loan, Disaggregated by PD grade		228,258	238,230
Commercial Loan P D Grade Eleven [Member] | Loans To Mortgage Companies [Member] | Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loan, Disaggregated by PD grade		0	0
Commercial Loan P D Grade Eleven [Member] | TRUPs [Member] | Commercial Portfolio Segment [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] | Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loan, Disaggregated by PD grade		17,501	20,600
Commercial Loan P D Grade Eleven [Member] | Residential C R E [Member] | Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loan, Disaggregated by PD grade		5,454	6,541
Commercial Loan P D Grade Twelve [Member] | Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loan, Disaggregated by PD grade		$ 194,990	$ 190,094
Percent of total commercial loans		1.00%	1.00%
Allowance for loan losses		$ 6,862	$ 6,377
Commercial Loan P D Grade Twelve [Member] | General C I [Member] | Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loan, Disaggregated by PD grade		162,238	170,531
Commercial Loan P D Grade Twelve [Member] | Loans To Mortgage Companies [Member] | Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loan, Disaggregated by PD grade		13,956	0
Commercial Loan P D Grade Twelve [Member] | TRUPs [Member] | Commercial Portfolio Segment [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] | Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loan, Disaggregated by PD grade		15,831	15,395
Commercial Loan P D Grade Twelve [Member] | Residential C R E [Member] | Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loan, Disaggregated by PD grade		2,965	4,168
Commercial Loan P D Grade Thirteen [Member] | Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loan, Disaggregated by PD grade		$ 424,963	$ 432,571
Percent of total commercial loans		3.00%	3.00%
Allowance for loan losses		$ 3,757	$ 4,225
Commercial Loan P D Grade Thirteen [Member] | General C I [Member] | Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loan, Disaggregated by PD grade		115,844	121,276
Commercial Loan P D Grade Thirteen [Member] | Loans To Mortgage Companies [Member] | Commercial Portfolio Segment [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] | Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loan, Disaggregated by PD grade	[1]	304,236	304,236
Commercial Loan P D Grade Thirteen [Member] | Income C R E [Member] | Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loan, Disaggregated by PD grade		4,755	6,748
Commercial Loan P D Grade Thirteen [Member] | Residential C R E [Member] | Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loan, Disaggregated by PD grade		128	311
Commercial Loan P D Grade Fourteen Fifteen Sixteen [Member] | Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loan, Disaggregated by PD grade		$ 212,856	$ 212,603
Percent of total commercial loans		2.00%	1.00%
Allowance for loan losses		$ 23,177	$ 20,297
Commercial Loan P D Grade Fourteen Fifteen Sixteen [Member] | General C I [Member] | Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loan, Disaggregated by PD grade		197,230	194,572
Commercial Loan P D Grade Fourteen Fifteen Sixteen [Member] | Loans To Mortgage Companies [Member] | Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loan, Disaggregated by PD grade		48	59
Commercial Loan P D Grade Fourteen Fifteen Sixteen [Member] | TRUPs [Member] | Commercial Portfolio Segment [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] | Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loan, Disaggregated by PD grade		14,395	16,313
Commercial Loan P D Grade Fourteen Fifteen Sixteen [Member] | Residential C R E [Member] | Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loan, Disaggregated by PD grade		$ 1,183	$ 1,659

[1] Balances as of March 31 , 2017 and December 31, 2016 , presented net of a $ 25.5 million valuation allowance . Based on the underlying structure of the notes , the highest possible internal grade is " 13 ".