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Loans Receivable (Recorded Investment in loans individually evaluated for impairment) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Sep. 30, 2014
Dec. 31, 2013
Financing Receivable, Impaired [Line Items]    
Allowance for loan and lease losses, non covered $ 64,859 $ 54,298
Non-covered originated loans [Member]
    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal 331,554 124,053
Recorded Investment 318,275 112,639
Allowance for loan and lease losses, non covered 9,040 10,139
Coverage 3.00% 9.00%
Non-covered acquired loans accounted under ASC 310-20
    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal 208 208
Recorded Investment 208 208
Allowance for loan and lease losses, non covered 0 0
Coverage 0.00% 0.00%
Non-covered acquired loans accounted under ASC 310-30
    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal 390,230 527,088
Recorded Investment 339,467 503,869
Allowance for loan and lease losses, non covered 10,120 2,863
Coverage 3.00% 1.00%
Commercial impaired loans with specific allowance [Member] | Non-covered originated loans [Member]
    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal 5,297 6,600
Recorded Investment 4,731 5,553
Allowance for loan and lease losses, non covered 1,108 1,431
Coverage 23.00% 26.00%
Residential troubled-debt restructuring impaired loans with specific allowance [Member] | Non-covered originated loans [Member]
    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal 97,289 89,539
Recorded Investment 91,692 84,494
Allowance for loan and lease losses, non covered 7,932 8,708
Coverage 9.00% 10.00%
Commercial impaired loans with no specific allowance [Member] | Non-covered originated loans [Member]
    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal 228,968 27,914
Recorded Investment 221,852 22,592
Commercial impaired loans with no specific allowance [Member] | Non-covered acquired loans accounted under ASC 310-20
    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal 208 208
Recorded Investment 208 208
Mortgage impaired non-covered loan pool [Member] | Non-covered acquired loans accounted under ASC 310-30
    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal   5,183
Recorded Investment   4,718
Allowance for loan and lease losses, non covered   57
Coverage   1.00%
Commercial impaired non-covered loan pool [Member] | Non-covered acquired loans accounted under ASC 310-30
    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal 294,966 48,100
Recorded Investment 257,234 40,411
Allowance for loan and lease losses, non covered 4,613 394
Coverage 2.00% 1.00%
Construction impaired non-covered loan pool [Member] | Non-covered acquired loans accounted under ASC 310-30
    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal 52,367 21,526
Recorded Investment 45,770 17,818
Allowance for loan and lease losses, non covered 5,502 1,319
Coverage 12.00% 7.00%
Consumer impaired non-covered loan pool [Member] | Non-covered acquired loans accounted under ASC 310-30
    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal 42,897 73,043
Recorded Investment 36,463 63,606
Allowance for loan and lease losses, non covered 5 361
Coverage 0.00% 1.00%
Auto impaired non-covered loan pool [Member] | Non-covered acquired loans accounted under ASC 310-30
    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal   379,236
Recorded Investment   377,316
Allowance for loan and lease losses, non covered   $ 732
Coverage   0.00%