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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	Sep. 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		$ 280,425
Available-for-sale, Gross Unrealized Gains		733
Available-for-sale, Gross Unrealized Losses		6,364
Available-for-sale, Fair Value	272,502	274,794
Held-to-maturity, Amortized Cost	9,274	8,551
Held-to-maturity, Gross Unrealized Gains	290	74
Held-to-maturity, Gross Unrealized Losses	17	190
Held-to-maturity, Fair value	9,547	8,435
Equity investments carried at fair value	46	291
Net unrealized gains recognized in AOCI	3
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		13,719
Available-for-sale, Gross Unrealized Losses		134
Available-for-sale, Fair Value		13,585
Held-to-maturity, Amortized Cost	54	45
Held-to-maturity, Fair value	54	45
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		35,284
Available-for-sale, Gross Unrealized Gains		1
Available-for-sale, Gross Unrealized Losses		811
Available-for-sale, Fair Value		34,474
Held-to-maturity, Amortized Cost	2,361	1,650
Held-to-maturity, Gross Unrealized Gains	138	72
Held-to-maturity, Gross Unrealized Losses	4	5
Held-to-maturity, Fair value	2,495	1,717
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		6,281
Available-for-sale, Gross Unrealized Losses		330
Available-for-sale, Fair Value		5,951
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		95,089
Available-for-sale, Gross Unrealized Losses		3,317
Available-for-sale, Fair Value		91,772
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		25,941
Available-for-sale, Gross Unrealized Losses		711
Available-for-sale, Fair Value		25,230
Common equity securities.
Schedule of Trading Securities and Other Trading Assets
Equity investments carried at fair value	46	291
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		13,576
Available-for-sale, Gross Unrealized Gains		237
Available-for-sale, Fair Value		13,813
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		90,535
Available-for-sale, Gross Unrealized Gains		495
Available-for-sale, Gross Unrealized Losses		1,061
Available-for-sale, Fair Value		89,969
Held-to-maturity, Amortized Cost	6,859	6,856
Held-to-maturity, Gross Unrealized Gains	152	2
Held-to-maturity, Gross Unrealized Losses	13	185
Held-to-maturity, Fair value	$ 6,998	$ 6,673

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