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Loans (Analysis of Loan Portfolio by Major Types of Loans) (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Jun. 30, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Dec. 31, 2015
Financing Receivable, Recorded Investment [Line Items]            
Less: unearned income on loans $ (29,229)   $ (33,718)      
Recorded Investment 6,512,006   6,213,423      
Allowance for loan losses (71,616) $ (72,984) (70,043) $ (70,264) $ (69,304) $ (68,172)
Loans, net 6,440,390   6,143,380      
Loans held for sale 7,802   5,846      
Loans, Excluding Purchased Credit Impaired Loans [Member]            
Financing Receivable, Recorded Investment [Line Items]            
Less: unearned income on loans (29,229)   (33,718)      
Recorded Investment 6,391,529   6,067,763      
Allowance for loan losses (64,272)   (59,528)      
Loans, net 6,327,257   6,008,235      
Loans held for sale 7,802   5,846      
Loans and Leases Receivable, Gross 6,391,529   6,067,763      
Purchased Credit Impaired Loans [Member]            
Financing Receivable, Recorded Investment [Line Items]            
Less: unearned income on loans 0   0      
Recorded Investment 120,477   145,660      
Allowance for loan losses (7,344)   (10,515)      
Loans, net 113,133   135,145      
Loans held for sale 0   0      
Loans and Leases Receivable, Gross 129,150   157,251      
Acquisition Accounting Valuation Discount on Covered Loans 8,673   11,591      
Commercial and Multifamily Residential Construction [Domain] | Purchased Credit Impaired Loans [Member]            
Financing Receivable, Recorded Investment [Line Items]            
Loans and Leases Receivable, Gross 1,059   1,726      
One-to-Four Family Residential [Member]            
Financing Receivable, Recorded Investment [Line Items]            
Loans and Leases Receivable, Gross, Consumer, Mortgage 190,812   188,193      
Loans and Leases Receivable, Gross, Consumer, Construction 145,796   122,719      
Allowance for loan losses (671) (628) (599) (977) (675) (916)
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 176,487   170,331      
Loans and Leases Receivable, Gross, Consumer, Construction 145,419   121,887      
Loans and Leases Receivable, Gross 174,490   167,932      
One-to-Four Family Residential [Member] | Purchased Credit Impaired Loans [Member]            
Financing Receivable, Recorded Investment [Line Items]            
Loans and Leases Receivable, Gross, Consumer, Mortgage 14,325   17,862      
Loans and Leases Receivable, Gross, Consumer, Construction 377   832      
Loans and Leases Receivable, Gross 16,698   20,643      
Commercial and Multifamily Residential [Member]            
Financing Receivable, Recorded Investment [Line Items]            
Loans Receivable, Gross, Commercial, Mortgage 2,905,130   2,809,061      
Loans Receivable, Gross, Commercial, Construction 214,897   210,683      
Commercial and Multifamily Residential [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]            
Financing Receivable, Recorded Investment [Line Items]            
Loans Receivable, Gross, Commercial, Mortgage 2,825,794   2,719,830      
Loans Receivable, Gross, Commercial, Construction 213,939   209,118      
Commercial and Multifamily Residential [Member] | Purchased Credit Impaired Loans [Member]            
Financing Receivable, Recorded Investment [Line Items]            
Loans Receivable, Gross, Commercial, Mortgage 79,336   89,231      
Loans Receivable, Gross, Commercial, Construction 958   1,565      
Loans and Leases Receivable, Gross 83,082   94,795      
Commercial Portfolio Segment [Member]            
Financing Receivable, Recorded Investment [Line Items]            
Loans Receivable, Gross, Commercial and Industrial 2,748,868   2,571,239      
Commercial Portfolio Segment [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]            
Financing Receivable, Recorded Investment [Line Items]            
Loans Receivable, Gross, Commercial and Industrial 2,735,206   2,551,054      
Commercial Portfolio Segment [Member] | Purchased Credit Impaired Loans [Member]            
Financing Receivable, Recorded Investment [Line Items]            
Loans Receivable, Gross, Commercial and Industrial 13,662   20,185      
Loans and Leases Receivable, Gross 14,895   21,606      
Real Estate Portfolio Segment [Member]            
Financing Receivable, Recorded Investment [Line Items]            
Loans Receivable Real Estate Mortgage 3,095,942   2,997,254      
Real Estate Portfolio Segment [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]            
Financing Receivable, Recorded Investment [Line Items]            
Loans Receivable Real Estate Mortgage 3,002,281   2,890,161      
Real Estate Portfolio Segment [Member] | Purchased Credit Impaired Loans [Member]            
Financing Receivable, Recorded Investment [Line Items]            
Loans Receivable Real Estate Mortgage 93,661   107,093      
Loans and Leases Receivable, Gross 99,780   115,438      
One-to-Four Family Residential Construction [Domain] | Purchased Credit Impaired Loans [Member]            
Financing Receivable, Recorded Investment [Line Items]            
Loans and Leases Receivable, Gross 377   832      
Real Estate Construction Portfolio Segment [Member]            
Financing Receivable, Recorded Investment [Line Items]            
Loans Receivable Real Estate Construction 360,693   333,402      
Real Estate Construction Portfolio Segment [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]            
Financing Receivable, Recorded Investment [Line Items]            
Loans Receivable Real Estate Construction 359,358   331,005      
Real Estate Construction Portfolio Segment [Member] | Purchased Credit Impaired Loans [Member]            
Financing Receivable, Recorded Investment [Line Items]            
Loans Receivable Real Estate Construction 1,335   2,397      
Loans and Leases Receivable, Gross 1,436   2,558      
Consumer Portfolio Segment [Member]            
Financing Receivable, Recorded Investment [Line Items]            
Loans and Leases Receivable, Gross, Consumer 335,732   345,246      
Allowance for loan losses (3,673) $ (3,551) (3,534) $ (3,743) $ (3,559) $ (3,531)
Consumer Portfolio Segment [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]            
Financing Receivable, Recorded Investment [Line Items]            
Loans and Leases Receivable, Gross, Consumer 323,913   329,261      
Loans and Leases Receivable, Gross 321,503   324,522      
Consumer Portfolio Segment [Member] | Purchased Credit Impaired Loans [Member]            
Financing Receivable, Recorded Investment [Line Items]            
Loans and Leases Receivable, Gross, Consumer 11,819   15,985      
Loans and Leases Receivable, Gross $ 13,039   $ 17,649