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Loans (Analysis of Loan Portfolio by Major Types of Loans) (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Mar. 31, 2018
Dec. 31, 2017
Financing Receivable, Recorded Investment [Line Items]        
Less: unearned income on loans $ (38,681) $ (42,194)    
Recorded Investment 8,520,798 8,391,511    
Allowance for loan losses (83,274) (83,369) $ (79,827) $ (75,646)
Loans, net 8,437,524 8,308,142    
Loans held for sale 4,017 3,849    
Loans, Excluding Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Less: unearned income on loans (38,681) (42,194)    
Recorded Investment 8,432,541 8,301,751    
Allowance for loan losses (80,029) (79,758)    
Loans, net 8,352,512 8,221,993    
Loans held for sale 4,017 3,849    
Loans and Leases Receivable, Gross 8,432,541 8,301,751    
Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Less: unearned income on loans 0 0    
Recorded Investment 88,257 89,760    
Allowance for loan losses (3,245) (3,611)    
Loans, net 85,012 86,149    
Loans held for sale 0 0    
Loans and Leases Receivable, Gross 94,418 96,285    
Acquisition Accounting Valuation Discount on Covered Loans 6,161 6,525    
Commercial Portfolio Segment [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans Receivable, Gross, Commercial and Industrial 3,519,386 3,447,662    
Commercial Portfolio Segment [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans Receivable, Gross, Commercial and Industrial 3,509,472 3,438,422    
Commercial Portfolio Segment [Member] | Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans Receivable, Gross, Commercial and Industrial 9,914 9,240    
Loans and Leases Receivable, Gross 10,270 9,672    
One-to-Four Family Residential [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross, Consumer, Mortgage 290,167 246,384    
Loans and Leases Receivable, Gross, Consumer, Construction 208,047 217,943    
Allowance for loan losses (616) (593) (558) (701)
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 282,673 238,367    
Loans and Leases Receivable, Gross, Consumer, Construction 207,900 217,790    
Loans and Leases Receivable, Gross 282,330 236,026    
One-to-Four Family Residential [Member] | Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross, Consumer, Mortgage 7,494 8,017    
Loans and Leases Receivable, Gross, Consumer, Construction 147 153    
Loans and Leases Receivable, Gross 9,258 9,848    
Commercial and Multifamily Residential [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans Receivable, Gross, Commercial, Mortgage 3,979,494 3,908,937    
Loans Receivable, Gross, Commercial, Construction 240,977 284,928    
Commercial and Multifamily Residential [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans Receivable, Gross, Commercial, Mortgage 3,917,833 3,846,027    
Loans Receivable, Gross, Commercial, Construction 240,458 284,394    
Commercial and Multifamily Residential [Member] | Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans Receivable, Gross, Commercial, Mortgage 61,661 62,910    
Loans Receivable, Gross, Commercial, Construction 519 534    
Loans and Leases Receivable, Gross 64,958 66,340    
Real Estate Portfolio Segment [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans Receivable Real Estate Mortgage 4,269,661 4,155,321    
Real Estate Portfolio Segment [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans Receivable Real Estate Mortgage 4,200,506 4,084,394    
Real Estate Portfolio Segment [Member] | Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans Receivable Real Estate Mortgage 69,155 70,927    
Loans and Leases Receivable, Gross 74,216 76,188    
Real Estate Construction Portfolio Segment [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans Receivable Real Estate Construction 449,024 502,871    
Real Estate Construction Portfolio Segment [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans Receivable Real Estate Construction 448,358 502,184    
Real Estate Construction Portfolio Segment [Member] | Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans Receivable Real Estate Construction 666 687    
Loans and Leases Receivable, Gross 638 660    
Consumer Portfolio Segment [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross, Consumer 321,408 327,851    
Allowance for loan losses (5,545) (5,301) $ (5,216) $ (5,163)
Consumer Portfolio Segment [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross, Consumer 312,886 318,945    
Loans and Leases Receivable, Gross 312,325 318,215    
Consumer Portfolio Segment [Member] | Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross, Consumer 8,522 8,906    
Loans and Leases Receivable, Gross 9,294 9,765    
One-to-Four Family Residential Construction [Domain] | Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross 147 153    
Commercial and Multifamily Residential Construction [Domain] | Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross $ 491 $ 507