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Loans (Analysis of Loan Portfolio by Major Types of Loans) (Details) - USD ($)
$ in Thousands
Sep. 30, 2016
Jun. 30, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Dec. 31, 2014
Financing Receivable, Recorded Investment [Line Items]            
Less: unearned income on loans $ (36,236)   $ (42,373)      
Recorded Investment 6,259,757   5,815,027      
Allowance for loan losses (70,264) $ (69,304) (68,172) $ (69,049) $ (69,257) $ (69,569)
Loans, net 6,189,493   5,746,855      
Loans held for sale 3,361   4,509      
Loans, Excluding Purchased Credit Impaired Loans [Member]            
Financing Receivable, Recorded Investment [Line Items]            
Less: unearned income on loans (36,236)   (42,373)      
Recorded Investment 6,106,993   5,634,121      
Allowance for loan losses (58,762)   (54,446)      
Loans, net 6,048,231   5,579,675      
Loans held for sale 3,361   4,509      
Loans and Leases Receivable, Gross 6,106,993   5,634,121      
Purchased Credit Impaired Loans [Member]            
Financing Receivable, Recorded Investment [Line Items]            
Less: unearned income on loans 0   0      
Recorded Investment 152,764   180,906      
Allowance for loan losses (11,502)   (13,726)      
Loans, net 141,262   167,180      
Loans held for sale 0   0      
Loans and Leases Receivable, Gross 165,094   197,350      
Acquisition Accounting Valuation Discount on Covered Loans 12,330   16,444      
Commercial and Multifamily Residential Construction [Domain] | Purchased Credit Impaired Loans [Member]            
Financing Receivable, Recorded Investment [Line Items]            
Loans and Leases Receivable, Gross 1,754   1,834      
One-to-Four Family Residential [Member]            
Financing Receivable, Recorded Investment [Line Items]            
Loans and Leases Receivable, Gross, Consumer, Mortgage 187,889   200,233      
Loans and Leases Receivable, Gross, Consumer, Construction 131,030   138,152      
Allowance for loan losses (977) (675) (916) (1,196) (1,355) (2,281)
One-to-Four Family Residential [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]            
Financing Receivable, Recorded Investment [Line Items]            
Loans and Leases Receivable, Gross, Consumer, Mortgage 168,511   176,295      
Loans and Leases Receivable, Gross, Consumer, Construction 130,163   135,874      
Loans and Leases Receivable, Gross 165,940   173,436      
One-to-Four Family Residential [Member] | Purchased Credit Impaired Loans [Member]            
Financing Receivable, Recorded Investment [Line Items]            
Loans and Leases Receivable, Gross, Consumer, Mortgage 19,378   23,938      
Loans and Leases Receivable, Gross, Consumer, Construction 867   2,278      
Loans and Leases Receivable, Gross 22,227   27,195      
Commercial and Multifamily Residential [Member]            
Financing Receivable, Recorded Investment [Line Items]            
Loans Receivable, Gross, Commercial, Mortgage 2,779,400   2,591,125      
Loans Receivable, Gross, Commercial, Construction 203,597   169,043      
Commercial and Multifamily Residential [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]            
Financing Receivable, Recorded Investment [Line Items]            
Loans Receivable, Gross, Commercial, Mortgage 2,686,783   2,491,736      
Loans Receivable, Gross, Commercial, Construction 202,014   167,413      
Commercial and Multifamily Residential [Member] | Purchased Credit Impaired Loans [Member]            
Financing Receivable, Recorded Investment [Line Items]            
Loans Receivable, Gross, Commercial, Mortgage 92,617   99,389      
Loans Receivable, Gross, Commercial, Construction 1,583   1,630      
Loans and Leases Receivable, Gross 98,178   106,308      
Commercial Portfolio Segment [Member]            
Financing Receivable, Recorded Investment [Line Items]            
Loans Receivable, Gross, Commercial and Industrial 2,652,575   2,397,423      
Commercial Portfolio Segment [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]            
Financing Receivable, Recorded Investment [Line Items]            
Loans Receivable, Gross, Commercial and Industrial 2,630,017   2,362,575      
Commercial Portfolio Segment [Member] | Purchased Credit Impaired Loans [Member]            
Financing Receivable, Recorded Investment [Line Items]            
Loans Receivable, Gross, Commercial and Industrial 22,558   34,848      
Loans and Leases Receivable, Gross 24,436   38,784      
Real Estate Portfolio Segment [Member]            
Financing Receivable, Recorded Investment [Line Items]            
Loans Receivable Real Estate Mortgage 2,967,289   2,791,358      
Real Estate Portfolio Segment [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]            
Financing Receivable, Recorded Investment [Line Items]            
Loans Receivable Real Estate Mortgage 2,855,294   2,668,031      
Real Estate Portfolio Segment [Member] | Purchased Credit Impaired Loans [Member]            
Financing Receivable, Recorded Investment [Line Items]            
Loans Receivable Real Estate Mortgage 111,995   123,327      
Loans and Leases Receivable, Gross 120,405   133,503      
One-to-Four Family Residential Construction [Domain] | Purchased Credit Impaired Loans [Member]            
Financing Receivable, Recorded Investment [Line Items]            
Loans and Leases Receivable, Gross 867   2,326      
Real Estate Construction Portfolio Segment [Member]            
Financing Receivable, Recorded Investment [Line Items]            
Loans Receivable Real Estate Construction 334,627   307,195      
Real Estate Construction Portfolio Segment [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]            
Financing Receivable, Recorded Investment [Line Items]            
Loans Receivable Real Estate Construction 332,177   303,287      
Real Estate Construction Portfolio Segment [Member] | Purchased Credit Impaired Loans [Member]            
Financing Receivable, Recorded Investment [Line Items]            
Loans Receivable Real Estate Construction 2,450   3,908      
Loans and Leases Receivable, Gross 2,621   4,160      
Consumer Portfolio Segment [Member]            
Financing Receivable, Recorded Investment [Line Items]            
Loans and Leases Receivable, Gross, Consumer 341,502   361,424      
Allowance for loan losses (3,743) $ (3,559) (3,531) $ (3,217) $ (3,182) $ (3,180)
Consumer Portfolio Segment [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]            
Financing Receivable, Recorded Investment [Line Items]            
Loans and Leases Receivable, Gross, Consumer 325,741   342,601      
Loans and Leases Receivable, Gross 319,875   332,362      
Consumer Portfolio Segment [Member] | Purchased Credit Impaired Loans [Member]            
Financing Receivable, Recorded Investment [Line Items]            
Loans and Leases Receivable, Gross, Consumer 15,761   18,823      
Loans and Leases Receivable, Gross $ 17,632   $ 20,903