Shareholders' Equity - Additional Information (Details) - USD ($) $ in Thousands		12 Months Ended
	Feb. 21, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Capital conservation buffer rate		1.875%	1.25%
Shares issued from treasury stock (in shares)		0	0
Issuance of common stock (in shares)	8,900,000
Proceeds from issuance of common stock	$ 56,700	$ 0	$ 55,641	$ 0
Legal and professional fees	$ 1,100
Parent
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Issuance of common stock (in shares)	2,700,000
Shareholders
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Issuance of common stock (in shares)	6,200,000
Stock Purchase Plan
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Reserved common shares for issuance (in shares)		300,000
Profit Sharing Plan
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Reserved common shares for issuance (in shares)		1,000,000