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Investment securities - Amortized Cost and Fair Value of Investment Securities Aggregated by Investment Category (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Schedule of Trading Securities and Other Trading Assets    
Available-for-sale, Amortized Cost   $ 273,785
Available-for-sale, Gross Unrealized Gains   1,669
Available-for-sale, Gross Unrealized Losses   2,906
Available-for-sale, Fair Value   272,548
Available-for-sale, Amortized Cost $ 274,990  
Available-for-sale, Gross Unrealized Gains 1,264  
Available-for-sale, Gross Unrealized Losses 4,876  
Available-for-sale, Fair Value 271,378 272,548
Held-to-maturity, Amortized Cost 9,028 9,274
Held-to-maturity, Gross Unrealized Gains 138 290
Held-to-maturity, Gross Unrealized Losses 62 17
Held-to-maturity, Fair value 9,104 9,547
Equity investments carried at fair value 189  
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 13,135  
Available-for-sale, Gross Unrealized Gains 1  
Available-for-sale, Gross Unrealized Losses 106  
Available-for-sale, Fair Value 13,030  
Held-to-maturity, Amortized Cost 51 54
Held-to-maturity, Fair value 51 54
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 22,127  
Available-for-sale, Gross Unrealized Gains 3  
Available-for-sale, Gross Unrealized Losses 397  
Available-for-sale, Fair Value 21,733  
Held-to-maturity, Amortized Cost 2,119 2,361
Held-to-maturity, Gross Unrealized Gains 114 138
Held-to-maturity, Gross Unrealized Losses 5 4
Held-to-maturity, Fair value 2,228 2,495
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 6,303  
Available-for-sale, Gross Unrealized Losses 263  
Available-for-sale, Fair Value 6,040  
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 95,268  
Available-for-sale, Gross Unrealized Gains 6  
Available-for-sale, Gross Unrealized Losses 2,777  
Available-for-sale, Fair Value 92,497  
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 25,927  
Available-for-sale, Gross Unrealized Gains 7  
Available-for-sale, Gross Unrealized Losses 458  
Available-for-sale, Fair Value 25,476  
Common equity securities.    
Schedule of Trading Securities and Other Trading Assets    
Available-for-sale, Amortized Cost   43
Available-for-sale, Gross Unrealized Gains   3
Available-for-sale, Fair Value   46
Equity investments carried at fair value 189  
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 14,525  
Available-for-sale, Gross Unrealized Gains 383  
Available-for-sale, Fair Value 14,908  
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 97,705  
Available-for-sale, Gross Unrealized Gains 864  
Available-for-sale, Gross Unrealized Losses 875  
Available-for-sale, Fair Value 97,694  
Held-to-maturity, Amortized Cost 6,858 6,859
Held-to-maturity, Gross Unrealized Gains 24 152
Held-to-maturity, Gross Unrealized Losses 57 13
Held-to-maturity, Fair value $ 6,825 $ 6,998