Loans and Allowance for Credit Losses Total Impaired Loans by Class Segments (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015	Mar. 31, 2015
Impaired Financing Receivables [Line Items]
Percentage of unallocated allowance	4.00%		5.00%
Unpaid principal balance, with no related allowance	$ 54,310	$ 60,590
Unpaid principal balance, with related allowance	167,347	174,199
Unpaid Principal Balance	221,657	234,789
Recorded investment, with no related allowance	47,759	49,953
Recorded investment, with related allowance	134,707	140,128
Recorded Investment	182,466	190,081
Related Allowance	50,591	51,590
Real-estate commercial mortage [Member]
Impaired Financing Receivables [Line Items]
Unpaid principal balance, with no related allowance	26,361	27,872
Unpaid principal balance, with related allowance	44,849	45,189
Recorded investment, with no related allowance	23,023	22,596
Recorded investment, with related allowance	35,265	35,698
Related Allowance	12,397	12,471
Commercial - Secured [Member]
Impaired Financing Receivables [Line Items]
Unpaid principal balance, with no related allowance	14,638	18,012
Unpaid principal balance, with related allowance	34,752	39,659
Recorded investment, with no related allowance	12,227	13,702
Recorded investment, with related allowance	29,655	33,629
Related Allowance	12,850	14,085
Commercial - unsecured [Member]
Impaired Financing Receivables [Line Items]
Unpaid principal balance, with related allowance	1,039	971
Recorded investment, with related allowance	884	821
Related Allowance	514	498
Real-estate - home equity [Member]
Impaired Financing Receivables [Line Items]
Unpaid principal balance, with related allowance	23,115	20,347
Recorded investment, with related allowance	18,024	15,766
Related Allowance	8,983	7,993
Real-estate - residential mortgage [Member]
Impaired Financing Receivables [Line Items]
Unpaid principal balance, with no related allowance	6,395	4,790
Unpaid principal balance, with related allowance	50,803	55,242
Recorded investment, with no related allowance	6,211	4,790
Recorded investment, with related allowance	42,134	45,635
Related Allowance	12,329	13,422
Construction - commercial residential [Member]
Impaired Financing Receivables [Line Items]
Unpaid principal balance, with no related allowance	6,916	9,916
Unpaid principal balance, with related allowance	9,774	9,949
Recorded investment, with no related allowance	6,298	8,865
Recorded investment, with related allowance	6,088	6,290
Related Allowance	1,851	2,110
Construction - Commercial [Member]
Impaired Financing Receivables [Line Items]
Unpaid principal balance, with related allowance	815	820
Recorded investment, with related allowance	594	638
Related Allowance	201	217
Construction other [Member]
Impaired Financing Receivables [Line Items]
Unpaid principal balance, with related allowance	747	331
Recorded investment, with related allowance	610	193
Related Allowance	226	68
Consumer - direct [Member]
Impaired Financing Receivables [Line Items]
Unpaid principal balance, with related allowance	20	19
Recorded investment, with related allowance	20	19
Related Allowance	14	14
Consumer - Indirect [Member]
Impaired Financing Receivables [Line Items]
Unpaid principal balance, with related allowance	12	14
Recorded investment, with related allowance	12	14
Related Allowance	8	8
Leasing and other and overdrafts [Member]
Impaired Financing Receivables [Line Items]
Unpaid principal balance, with related allowance	1,421	1,658
Recorded investment, with related allowance	1,421	1,425
Related Allowance	$ 1,218	$ 704

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Amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 14A
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953550-111524

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+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
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-Section 50
-Paragraph 15
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=49124121&loc=d3e5212-111524

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (a)(4)
-URI http://asc.fasb.org/extlink&oid=49124121&loc=d3e5212-111524

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+ References

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-Publisher FASB
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