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Loans (Analysis of Loan Portfolio by Major Types of Loans) (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Mar. 31, 2017
Dec. 31, 2016
Financing Receivable, Recorded Investment [Line Items]        
Less: unearned income on loans $ (48,252) $ (52,111)    
Recorded Investment 8,339,631 8,358,657    
Allowance for loan losses (79,827) (75,646) $ (71,021) $ (70,043)
Loans, net 8,259,804 8,283,011    
Loans held for sale 4,312 5,766    
Loans, Excluding Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Less: unearned income on loans (48,252) (52,111)    
Recorded Investment 8,230,332 8,245,987    
Allowance for loan losses (74,162) (68,739)    
Loans, net 8,156,170 8,177,248    
Loans held for sale 4,312 5,766    
Loans and Leases Receivable, Gross 8,230,332 8,245,987    
Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Less: unearned income on loans 0 0    
Recorded Investment 109,299 112,670    
Allowance for loan losses (5,665) (6,907)    
Loans, net 103,634 105,763    
Loans held for sale 0 0    
Loans and Leases Receivable, Gross 117,088 120,758    
Acquisition Accounting Valuation Discount on Covered Loans 7,789 8,088    
Commercial and Multifamily Residential Construction [Domain] | Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross 589 595    
One-to-Four Family Residential [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross, Consumer, Mortgage 192,986 200,791    
Loans and Leases Receivable, Gross, Consumer, Construction 208,612 200,695    
Allowance for loan losses (558) (701) (645) (599)
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 182,302 188,396    
Loans and Leases Receivable, Gross, Consumer, Construction 208,441 200,518    
Loans and Leases Receivable, Gross 180,568 186,554    
One-to-Four Family Residential [Member] | Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross, Consumer, Mortgage 10,684 12,395    
Loans and Leases Receivable, Gross, Consumer, Construction 171 177    
Loans and Leases Receivable, Gross 12,738 14,610    
Commercial and Multifamily Residential [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans Receivable, Gross, Commercial, Mortgage 3,850,155 3,901,333    
Loans Receivable, Gross, Commercial, Construction 385,950 372,538    
Commercial and Multifamily Residential [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans Receivable, Gross, Commercial, Mortgage 3,776,709 3,825,739    
Loans Receivable, Gross, Commercial, Construction 385,339 371,931    
Commercial and Multifamily Residential [Member] | Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans Receivable, Gross, Commercial, Mortgage 73,446 75,594    
Loans Receivable, Gross, Commercial, Construction 611 607    
Loans and Leases Receivable, Gross 77,400 79,211    
Commercial Portfolio Segment [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans Receivable, Gross, Commercial and Industrial 3,415,698 3,389,952    
Commercial Portfolio Segment [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans Receivable, Gross, Commercial and Industrial 3,402,162 3,377,324    
Commercial Portfolio Segment [Member] | Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans Receivable, Gross, Commercial and Industrial 13,536 12,628    
Loans and Leases Receivable, Gross 14,201 13,753    
Real Estate Portfolio Segment [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans Receivable Real Estate Mortgage 4,043,141 4,102,124    
Real Estate Portfolio Segment [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans Receivable Real Estate Mortgage 3,959,011 4,014,135    
Real Estate Portfolio Segment [Member] | Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans Receivable Real Estate Mortgage 84,130 87,989    
Loans and Leases Receivable, Gross 90,138 93,821    
One-to-Four Family Residential Construction [Domain] | Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross 171 177    
Real Estate Construction Portfolio Segment [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans Receivable Real Estate Construction 594,562 573,233    
Real Estate Construction Portfolio Segment [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans Receivable Real Estate Construction 593,780 572,449    
Real Estate Construction Portfolio Segment [Member] | Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans Receivable Real Estate Construction 782 784    
Loans and Leases Receivable, Gross 760 772    
Consumer Portfolio Segment [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross, Consumer 334,482 345,459    
Allowance for loan losses (5,216) (5,163) $ (3,360) $ (3,534)
Consumer Portfolio Segment [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross, Consumer 323,631 334,190    
Loans and Leases Receivable, Gross 322,076 332,225    
Consumer Portfolio Segment [Member] | Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross, Consumer 10,851 11,269    
Loans and Leases Receivable, Gross $ 11,989 $ 12,412