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Investment securities - Schedule of Gross Unrealized Losses (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Debt Securities, Available-for-sale [Abstract]
Debt securities, available-for-sale, unrealized loss, less than 12 months, fair value	$ 167,138	$ 63,074
Debt securities, available-for-sale, continuous unrealized loss position, less than 12 months, accumulated loss	(1,035)	(394)
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer, fair value	0	175,730
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer, accumulated loss	0	(1,497)
Debt securities, available-for-sale, continuous unrealized loss position, fair value	167,138	238,804
Debt securities, available-for-sale, unrealized loss position, accumulated loss	(1,035)	(1,891)
Mortgage-backed securities - residential
Debt Securities, Available-for-sale [Abstract]
Debt securities, available-for-sale, unrealized loss, less than 12 months, fair value	107,236	47,641
Debt securities, available-for-sale, continuous unrealized loss position, less than 12 months, accumulated loss	(320)	(164)
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer, fair value	0	175,730
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer, accumulated loss	0	(1,497)
Debt securities, available-for-sale, continuous unrealized loss position, fair value	107,236	223,371
Debt securities, available-for-sale, unrealized loss position, accumulated loss	(320)	(1,661)
Municipals, tax exempt
Debt Securities, Available-for-sale [Abstract]
Debt securities, available-for-sale, unrealized loss, less than 12 months, fair value	56,923	15,433
Debt securities, available-for-sale, continuous unrealized loss position, less than 12 months, accumulated loss	(694)	(230)
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer, fair value	0	0
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer, accumulated loss	0	0
Debt securities, available-for-sale, continuous unrealized loss position, fair value	56,923	15,433
Debt securities, available-for-sale, unrealized loss position, accumulated loss	(694)	$ (230)
Corporate securities
Debt Securities, Available-for-sale [Abstract]
Debt securities, available-for-sale, unrealized loss, less than 12 months, fair value	985
Debt securities, available-for-sale, continuous unrealized loss position, less than 12 months, accumulated loss	(15)
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer, fair value	0
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer, accumulated loss	0
Debt securities, available-for-sale, continuous unrealized loss position, fair value	985
Debt securities, available-for-sale, unrealized loss position, accumulated loss	(15)
U.S. government agency securities
Debt Securities, Available-for-sale [Abstract]
Debt securities, available-for-sale, unrealized loss, less than 12 months, fair value	1,994
Debt securities, available-for-sale, continuous unrealized loss position, less than 12 months, accumulated loss	(6)
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer, fair value	0
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer, accumulated loss	0
Debt securities, available-for-sale, continuous unrealized loss position, fair value	1,994
Debt securities, available-for-sale, unrealized loss position, accumulated loss	$ (6)

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