v3.8.0.1
Loans - Summary of Delinquent and Nonaccrual Loans (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Accounts Notes And Loans Receivable [Line Items]    
Total Past Due and Nonaccrual $ 20,380 $ 14,168
90 Days or More Past Due and Still Accruing 2,145 5,928
Nonaccrual Past Due and Still Accruing 6,494 8,238
Current 3,229,480 2,537,848
Total loans $ 3,249,860 $ 2,552,016
Percentage of Total Loans Due 30-59 Days 0.36%  
Percentage of Total Loans Due 60-89 Days   0.00%
Percentage of Total Loans Due 90 Days or More 0.07% 0.23%
Percentage of Total Loans Due Nonaccrual 0.20% 0.32%
Percentage of Total Loans 0.63% 0.56%
Residential Properties    
Accounts Notes And Loans Receivable [Line Items]    
Total loans $ 2,400,539 $ 1,780,889
Commercial Real Estate    
Accounts Notes And Loans Receivable [Line Items]    
Total loans 529,590 476,959
Commercial and Industrial Loans    
Accounts Notes And Loans Receivable [Line Items]    
Total Past Due and Nonaccrual 16,957 7,161
90 Days or More Past Due and Still Accruing 815 3,800
Nonaccrual Past Due and Still Accruing 5,216 3,359
Current 243,001 230,780
Total loans 259,958 237,941
Consumer Loans    
Accounts Notes And Loans Receivable [Line Items]    
Current 28,469 32,127
Total loans 28,469 32,127
30-59 Days    
Accounts Notes And Loans Receivable [Line Items]    
Total Past Due and Nonaccrual 11,741  
30-59 Days | Commercial and Industrial Loans    
Accounts Notes And Loans Receivable [Line Items]    
Total Past Due and Nonaccrual 10,926  
60-89 Days    
Accounts Notes And Loans Receivable [Line Items]    
Total Past Due and Nonaccrual   2
60-89 Days | Commercial and Industrial Loans    
Accounts Notes And Loans Receivable [Line Items]    
Total Past Due and Nonaccrual   2
Real Estate Loans    
Accounts Notes And Loans Receivable [Line Items]    
Total loans 2,961,433 2,281,948
Real Estate Loans | Residential Properties    
Accounts Notes And Loans Receivable [Line Items]    
Total Past Due and Nonaccrual 53 3,759
Nonaccrual Past Due and Still Accruing   3,759
Current 2,400,486 1,777,130
Total loans 2,400,539 1,780,889
Real Estate Loans | Commercial Real Estate    
Accounts Notes And Loans Receivable [Line Items]    
Total Past Due and Nonaccrual 3,370 3,248
90 Days or More Past Due and Still Accruing 1,330 2,128
Nonaccrual Past Due and Still Accruing 1,278 1,120
Current 526,220 473,711
Total loans 529,590 476,959
Real Estate Loans | Land and Construction    
Accounts Notes And Loans Receivable [Line Items]    
Current 31,304 24,100
Total loans 31,304 $ 24,100
Real Estate Loans | 30-59 Days | Residential Properties    
Accounts Notes And Loans Receivable [Line Items]    
Total Past Due and Nonaccrual 53  
Real Estate Loans | 30-59 Days | Commercial Real Estate    
Accounts Notes And Loans Receivable [Line Items]    
Total Past Due and Nonaccrual $ 762