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Loans and the Allowance for Loan Losses (Details) - Aging analysis - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Nonaccrual $ 65,613 $ 5,734
Total Past Due 72,784 20,551
Current 4,102,026 3,458,890
Loans 4,174,810 3,479,441
30 - 59 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 3,849 7,534
60 - 89 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 1,658 1,990
90 Days or Greater Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 1,664 5,293
Commercial Portfolio Segment [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Nonaccrual 47,363 1,460
Total Past Due 50,918 6,583
Current 773,164 546,993
Loans 824,082 553,576
Commercial Portfolio Segment [Member] | 30 - 59 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 1,708 475
Commercial Portfolio Segment [Member] | 60 - 89 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 183 18
Commercial Portfolio Segment [Member] | 90 Days or Greater Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 1,664 4,630
Commercial Real Estate Portfolio Segment [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Nonaccrual 12,757 1,081
Total Past Due 14,777 8,256
Current 2,578,132 2,196,454
Loans 2,592,909 2,204,710
Loans Receivable > 90 Days Past Due and Accruing 0  
Commercial Real Estate Portfolio Segment [Member] | 30 - 59 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 545 4,928
Commercial Real Estate Portfolio Segment [Member] | 60 - 89 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 1,475 1,584
Commercial Real Estate Portfolio Segment [Member] | 90 Days or Greater Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 663
Construction Loans [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Nonaccrual
Total Past Due
Current 483,216 486,228
Loans 483,216 486,228
Construction Loans [Member] | 30 - 59 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due
Construction Loans [Member] | 60 - 89 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due
Construction Loans [Member] | 90 Days or Greater Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due
Residential Portfolio Segment [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Nonaccrual 5,493 3,193
Total Past Due 7,071 5,712
Current 264,724 226,835
Loans 271,795 232,547
Residential Portfolio Segment [Member] | 30 - 59 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 1,578 2,131
Residential Portfolio Segment [Member] | 60 - 89 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 388
Residential Portfolio Segment [Member] | 90 Days or Greater Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due
Consumer Portfolio Segment [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Nonaccrual
Total Past Due 18
Current 2,790 2,380
Loans 2,808 2,380
Consumer Portfolio Segment [Member] | 30 - 59 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 18
Consumer Portfolio Segment [Member] | 60 - 89 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due
Consumer Portfolio Segment [Member] | 90 Days or Greater Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due