Annual report pursuant to Section 13 and 15(d)

Loans and Leases - Summary of PCI Loans (Details)

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Loans and Leases - Summary of PCI Loans (Details)
$ in Thousands
Dec. 31, 2017
USD ($)
loan_pool
SecurityLoan
Dec. 31, 2016
USD ($)
loan_pool
SecurityLoan
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Financing Receivable, Recorded Investment [Line Items]        
Total loans and leases $ 4,304,458 $ 3,844,769    
Allowance for loan and lease losses (31,043) (32,429)    
Loans and leases receivable, net 4,273,415 3,812,340    
Real estate loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Total loans and leases 3,590,914 3,278,375    
Real estate loans [Member] | Construction [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Total loans and leases 55,190 55,962    
Real estate loans [Member] | Residential property [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Total loans and leases 521,853 338,767    
Commercial and industrial loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Total loans and leases 399,201 300,220    
Consumer loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Total loans and leases 17,059 22,880    
PCI Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Total loans and leases 7,748 9,863    
Allowance for loan and lease losses (320) (971) $ (5,441)  
Loans and leases receivable, net 7,428 8,892 $ 14,573 $ 43,475
PCI Loans [Member] | Real estate loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Total loans and leases 7,659 9,677    
Allowance for loan and lease losses (259) (922)    
Loans and leases receivable, net 7,400 8,755    
PCI Loans [Member] | Real estate loans [Member] | Commercial real estate [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Total loans and leases 6,708 8,701    
PCI Loans [Member] | Real estate loans [Member] | Construction [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Total loans and leases 0 0    
PCI Loans [Member] | Real estate loans [Member] | Residential property [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Total loans and leases 951 976    
Allowance for loan and lease losses (83) (72)    
Loans and leases receivable, net 868 904    
PCI Loans [Member] | Commercial and industrial loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Total loans and leases 49 136    
PCI Loans [Member] | Consumer loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Total loans and leases 40 50    
Allowance for loan and lease losses (20) (8)    
Loans and leases receivable, net $ 20 $ 42    
PCI Loans [Member] | Pooled Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Number of loans | SecurityLoan 44,000 52,000    
Number of pools | loan_pool 11,000 10,000    
Total loans and leases $ 6,760 $ 7,966    
Percentage of total 87.20% 81.00%    
Allowance for loan and lease losses $ (218) $ (617)    
Loans and leases receivable, net $ 6,542 $ 7,349    
PCI Loans [Member] | Pooled Loans [Member] | Real estate loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Number of loans | SecurityLoan 40,000 45,000    
Number of pools | loan_pool 7,000 6,000    
Total loans and leases $ 6,708 $ 7,780    
Percentage of total 87.60% 80.00%    
PCI Loans [Member] | Pooled Loans [Member] | Real estate loans [Member] | Commercial real estate [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Number of loans | SecurityLoan 40,000 45,000    
Number of pools | loan_pool 7,000 6,000    
Total loans and leases $ 6,708 $ 7,780    
Percentage of total 100.00% 89.00%    
PCI Loans [Member] | Pooled Loans [Member] | Real estate loans [Member] | Construction [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Number of loans | SecurityLoan 0 0    
Number of pools | loan_pool 0 0    
Total loans and leases $ 0 $ 0    
Percentage of total 0.00% 0.00%    
PCI Loans [Member] | Pooled Loans [Member] | Real estate loans [Member] | Residential property [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Number of loans | SecurityLoan 0 0    
Number of pools | loan_pool 0 0    
Total loans and leases $ 0 $ 0    
Percentage of total 0.00% 0.00%    
PCI Loans [Member] | Pooled Loans [Member] | Commercial and industrial loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Number of loans | SecurityLoan 3,000 6,000    
Number of pools | loan_pool 3,000 3,000    
Total loans and leases $ 49 $ 136    
Percentage of total 100.00% 100.00%    
PCI Loans [Member] | Pooled Loans [Member] | Consumer loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Number of loans | SecurityLoan 1,000 1,000    
Number of pools | loan_pool 1,000 1,000    
Total loans and leases $ 3 $ 50    
Percentage of total 7.50% 100.00%    
PCI Loans [Member] | Non-Pooled Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Number of loans | SecurityLoan 2,000 3,000    
Total loans and leases $ 988 $ 1,897    
Percentage of total 12.80% 19.00%    
Allowance for loan and lease losses $ (102) $ (354)    
Loans and leases receivable, net $ 886 $ 1,543    
PCI Loans [Member] | Non-Pooled Loans [Member] | Real estate loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Number of loans | SecurityLoan 1,000 3,000    
Total loans and leases $ 951 $ 1,897    
Percentage of total 12.40% 20.00%    
PCI Loans [Member] | Non-Pooled Loans [Member] | Real estate loans [Member] | Commercial real estate [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Number of loans | SecurityLoan 0 1,000    
Total loans and leases $ 0 $ 921    
Percentage of total 0.00% 11.00%    
PCI Loans [Member] | Non-Pooled Loans [Member] | Real estate loans [Member] | Construction [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Number of loans | SecurityLoan 0 0    
Total loans and leases $ 0 $ 0    
Percentage of total 0.00% 0.00%    
PCI Loans [Member] | Non-Pooled Loans [Member] | Real estate loans [Member] | Residential property [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Number of loans | SecurityLoan 1,000 2,000    
Total loans and leases $ 951 $ 976    
Percentage of total 100.00% 100.00%    
PCI Loans [Member] | Non-Pooled Loans [Member] | Commercial and industrial loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Number of loans | SecurityLoan 0 0    
Total loans and leases $ 0 $ 0    
Percentage of total 0.00% 0.00%    
PCI Loans [Member] | Non-Pooled Loans [Member] | Consumer loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Number of loans | SecurityLoan 1,000 0    
Total loans and leases $ 37 $ 0    
Percentage of total 92.50% 0.00%