Securities (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2021 USD ($) Security	Jun. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)
Available-for-sale Securities, Amortized Cost Basis [Abstract]
Amortized cost	$ 1,312,668		$ 1,052,132
Unrealized Gains	20,780		21,431
Unrealized Losses	2,788		1,404
Fair Value	1,330,660		1,072,159
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Less Than Twelve Months, Fair Value	245,093		148,169
Less Than Twelve Months, Unrealized Losses	2,585		989
Twelve Months or More, Fair Value	13,645		28,257
Twelve Months or More, Unrealized Losses	203		415
Total, Fair Value	258,738		176,426
Total, Unrealized Losses	2,788		1,404
Available-for-sale, allowance for credit losses	0
Accrued interest receivable	5,400
Credit related charges recognized in earnings	0	$ 0
U.S. Agency [Member]
Available-for-sale Securities, Amortized Cost Basis [Abstract]
Amortized cost	8,355		10,456
Unrealized Gains	245		305
Unrealized Losses	4		13
Fair Value	8,596		10,748
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Less Than Twelve Months, Fair Value	0		1,469
Less Than Twelve Months, Unrealized Losses	0		3
Twelve Months or More, Fair Value	1,491		2,329
Twelve Months or More, Unrealized Losses	4		10
Total, Fair Value	1,491		3,798
Total, Unrealized Losses	$ 4		13
Number of securities with market fair value less than amortized cost | Security	12
U.S. Agency Residential Mortgage-Backed [Member]
Available-for-sale Securities, Amortized Cost Basis [Abstract]
Amortized cost	$ 364,072		340,224
Unrealized Gains	3,185		4,951
Unrealized Losses	1,890		593
Fair Value	365,367		344,582
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Less Than Twelve Months, Fair Value	144,894		96,839
Less Than Twelve Months, Unrealized Losses	1,830		592
Twelve Months or More, Fair Value	6,617		83
Twelve Months or More, Unrealized Losses	60		1
Total, Fair Value	151,511		96,922
Total, Unrealized Losses	$ 1,890		593
Number of securities with market fair value less than amortized cost | Security	47
U.S. Agency Commercial Mortgage-Backed [Member]
Available-for-sale Securities, Amortized Cost Basis [Abstract]
Amortized cost	$ 18,829		6,869
Unrealized Gains	197		326
Unrealized Losses	16		0
Fair Value	19,010		7,195
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Less Than Twelve Months, Fair Value	2,892
Less Than Twelve Months, Unrealized Losses	16
Twelve Months or More, Fair Value	0
Twelve Months or More, Unrealized Losses	0
Total, Fair Value	2,892
Total, Unrealized Losses	$ 16
Number of securities with market fair value less than amortized cost | Security	8
Private Label Mortgage-Backed [Member]
Available-for-sale Securities, Amortized Cost Basis [Abstract]
Amortized cost	$ 67,976		41,429
Unrealized Gains	1,329		1,539
Unrealized Losses	41		139
Fair Value	69,264		42,829
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Less Than Twelve Months, Fair Value	5,574		11,838
Less Than Twelve Months, Unrealized Losses	27		95
Twelve Months or More, Fair Value	1,426		2,050
Twelve Months or More, Unrealized Losses	14		44
Total, Fair Value	7,000		13,888
Total, Unrealized Losses	$ 41		139
Number of securities with market fair value less than amortized cost | Security	14
Other Asset Backed [Member]
Available-for-sale Securities, Amortized Cost Basis [Abstract]
Amortized cost	$ 193,509		252,596
Unrealized Gains	1,743		1,796
Unrealized Losses	26		211
Fair Value	195,226		254,181
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Less Than Twelve Months, Fair Value	10,466		7,142
Less Than Twelve Months, Unrealized Losses	15		25
Twelve Months or More, Fair Value	1,697		21,197
Twelve Months or More, Unrealized Losses	11		186
Total, Fair Value	12,163		28,339
Total, Unrealized Losses	$ 26		211
Number of securities with market fair value less than amortized cost | Security	17
Obligations of States and Political Subdivisions [Member]
Available-for-sale Securities, Amortized Cost Basis [Abstract]
Amortized cost	$ 509,250		315,780
Unrealized Gains	10,499		8,691
Unrealized Losses	533		178
Fair Value	519,216		324,293
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Less Than Twelve Months, Fair Value	60,954		28,957
Less Than Twelve Months, Unrealized Losses	533		177
Twelve Months or More, Fair Value	0		800
Twelve Months or More, Unrealized Losses	0		1
Total, Fair Value	60,954		29,757
Total, Unrealized Losses	$ 533		178
Number of securities with market fair value less than amortized cost | Security	116
Corporate [Member]
Available-for-sale Securities, Amortized Cost Basis [Abstract]
Amortized cost	$ 148,205		82,307
Unrealized Gains	3,570		3,807
Unrealized Losses	172		97
Fair Value	151,603		86,017
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Less Than Twelve Months, Fair Value	20,313		1,924
Less Than Twelve Months, Unrealized Losses	164		97
Twelve Months or More, Fair Value	547		0
Twelve Months or More, Unrealized Losses	8		0
Total, Fair Value	20,860		1,924
Total, Unrealized Losses	$ 172		97
Number of securities with market fair value less than amortized cost | Security	19
Trust Preferred [Member]
Available-for-sale Securities, Amortized Cost Basis [Abstract]
Amortized cost	$ 1,973		1,971
Unrealized Gains	0		0
Unrealized Losses	106		173
Fair Value	1,867		1,798
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Less Than Twelve Months, Fair Value	0		0
Less Than Twelve Months, Unrealized Losses	0		0
Twelve Months or More, Fair Value	1,867		1,798
Twelve Months or More, Unrealized Losses	106		173
Total, Fair Value	1,867		1,798
Total, Unrealized Losses	$ 106		173
Number of securities with market fair value less than amortized cost | Security	2
Number of issues rated as investment grade | Security	1
Number of securities not rated | Security	1
Non-rated securities, amortized cost	$ 1,000
Fair value of non-rated trust preferred securities	910
Foreign Government [Member]
Available-for-sale Securities, Amortized Cost Basis [Abstract]
Amortized cost	499		500
Unrealized Gains	12		16
Unrealized Losses	0		0
Fair Value	$ 511		$ 516