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Investment securities - Amortized Cost and Fair Value of Investment Securities Aggregated by Investment Category (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Jun. 30, 2018
Schedule of Trading Securities and Other Trading Assets    
Available-for-sale, Amortized Cost $ 273,742  
Available-for-sale, Gross Unrealized Gains 1,666  
Available-for-sale, Gross Unrealized Losses 2,906  
Available-for-sale, Fair Value 272,502  
Available-for-sale, Amortized Cost   $ 279,502
Available-for-sale, Gross Unrealized Gains   1,039
Available-for-sale, Gross Unrealized Losses   5,491
Available-for-sale, Fair Value 272,502 275,050
Held-to-maturity, Amortized Cost 9,274 8,780
Held-to-maturity, Gross Unrealized Gains 290 91
Held-to-maturity, Gross Unrealized Losses 17 113
Held-to-maturity, Fair value 9,547 8,758
Equity investments carried at fair value 46 278
Net unrealized gains recognized in AOCI 2  
Mortgage-backed Securities, U.S. Government agencies    
Schedule of Trading Securities and Other Trading Assets    
Available-for-sale, Amortized Cost 14,517  
Available-for-sale, Gross Unrealized Gains 2  
Available-for-sale, Gross Unrealized Losses 85  
Available-for-sale, Fair Value 14,434  
Available-for-sale, Amortized Cost   15,809
Available-for-sale, Gross Unrealized Losses   109
Available-for-sale, Fair Value   15,700
Held-to-maturity, Amortized Cost 54 48
Held-to-maturity, Gross Unrealized Gains   1
Held-to-maturity, Fair value 54 49
Mortgage-backed Securities, U.S. Government-sponsored enterprises    
Schedule of Trading Securities and Other Trading Assets    
Available-for-sale, Amortized Cost 19,752  
Available-for-sale, Gross Unrealized Gains 10  
Available-for-sale, Gross Unrealized Losses 231  
Available-for-sale, Fair Value 19,531  
Available-for-sale, Amortized Cost   27,461
Available-for-sale, Gross Unrealized Gains   1
Available-for-sale, Gross Unrealized Losses   523
Available-for-sale, Fair Value   26,939
Held-to-maturity, Amortized Cost 2,361 1,875
Held-to-maturity, Gross Unrealized Gains 138 84
Held-to-maturity, Gross Unrealized Losses 4 4
Held-to-maturity, Fair value 2,495 1,955
Commercial mortgage-backed Securities, U.S. Government-sponsored enterprises    
Schedule of Trading Securities and Other Trading Assets    
Available-for-sale, Amortized Cost 6,315  
Available-for-sale, Gross Unrealized Losses 120  
Available-for-sale, Fair Value 6,195  
Available-for-sale, Amortized Cost   6,292
Available-for-sale, Gross Unrealized Losses   319
Available-for-sale, Fair Value   5,973
U.S. Government-sponsored enterprises state and municipals    
Schedule of Trading Securities and Other Trading Assets    
Available-for-sale, Amortized Cost 95,358  
Available-for-sale, Gross Unrealized Gains 30  
Available-for-sale, Gross Unrealized Losses 1,740  
Available-for-sale, Fair Value 93,648  
Available-for-sale, Amortized Cost   95,179
Available-for-sale, Gross Unrealized Losses   3,131
Available-for-sale, Fair Value   92,048
U.S. Treasuries    
Schedule of Trading Securities and Other Trading Assets    
Available-for-sale, Amortized Cost 20,042  
Available-for-sale, Gross Unrealized Losses 228  
Available-for-sale, Fair Value 19,814  
Available-for-sale, Amortized Cost   25,934
Available-for-sale, Gross Unrealized Losses   587
Available-for-sale, Fair Value   25,347
Common equity securities.    
Schedule of Trading Securities and Other Trading Assets    
Equity investments carried at fair value 46 278
State and Municipals, Taxable    
Schedule of Trading Securities and Other Trading Assets    
Available-for-sale, Amortized Cost 14,559  
Available-for-sale, Gross Unrealized Gains 488  
Available-for-sale, Fair Value 15,047  
Available-for-sale, Amortized Cost   13,607
Available-for-sale, Gross Unrealized Gains   302
Available-for-sale, Fair Value   13,909
State and Municipals, Tax-exempt    
Schedule of Trading Securities and Other Trading Assets    
Available-for-sale, Amortized Cost 103,199  
Available-for-sale, Gross Unrealized Gains 1,136  
Available-for-sale, Gross Unrealized Losses 502  
Available-for-sale, Fair Value 103,833  
Available-for-sale, Amortized Cost   95,220
Available-for-sale, Gross Unrealized Gains   736
Available-for-sale, Gross Unrealized Losses   822
Available-for-sale, Fair Value   95,134
Held-to-maturity, Amortized Cost 6,859 6,857
Held-to-maturity, Gross Unrealized Gains 152 6
Held-to-maturity, Gross Unrealized Losses 13 109
Held-to-maturity, Fair value $ 6,998 $ 6,754