Parent Company Only Financial Statements - Parent Company Condensed Balance Sheets (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Assets
Cash and cash equivalents	$ 144,006	$ 40,651
Land, premises and equipment, net	20,629	21,743
Deferred income taxes, net	7,891	10,085
Other assets	29,968	32,687
Total assets	2,356,878	2,179,070	$ 2,136,081
Liabilities and Stockholders’ Equity
Long-term debt	58,769	58,824
Accrued expenses and other liabilities	32,201	30,539
Total liabilities	2,071,150	1,982,116
Commitments and contingent liabilities ESOP-owned shares		34,494
Stockholders’ equity	285,728	196,954
Less ESOP-owned shares		(34,494)
Total stockholders’ equity net ESOP-owned shares	285,728	162,460	$ 148,103	$ 139,216
Total liabilities and stockholders’ equity	2,356,878	2,179,070
Parent Company
Assets
Cash and cash equivalents	73,647	8,207
Land, premises and equipment, net	318	433
Investment in subsidiaries	274,878	250,252
Deferred income taxes, net	998	933
Other assets	1,034	1,538
Total assets	350,875	261,363
Liabilities and Stockholders’ Equity
Long-term debt	58,769	58,824
Accrued expenses and other liabilities	6,378	5,585
Total liabilities	65,147	64,409
Commitments and contingent liabilities ESOP-owned shares		34,494
Stockholders’ equity	285,728	196,954
Less ESOP-owned shares		(34,494)
Total stockholders’ equity net ESOP-owned shares	285,728	162,460
Total liabilities and stockholders’ equity	$ 350,875	$ 261,363