Derivative Financial Instruments (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Interest Rate Lock Commitments
Derivative Financial Instruments
Aggregate notional amount	$ 73,500		$ 73,500		$ 27,200
Forward Sales Commitments
Derivative Financial Instruments
Aggregate notional amount	107,500		107,500		48,600
Interest rate lock commitments and forward sales commitments
Gross gains and losses on derivative assets and liabilities recorded in Consolidated Statements of Income
Net gains (losses)	(20)	$ (31)	(60)	$ (353)
Interest rate lock commitments and forward sales commitments | Non-interest income
Gross gains and losses on derivative assets and liabilities recorded in Consolidated Statements of Income
Gross gains	1,929	1,023	3,007	1,755
Interest rate lock commitments and forward sales commitments | Non-interest expense
Gross gains and losses on derivative assets and liabilities recorded in Consolidated Statements of Income
Gross (losses)	(1,949)	(1,054)	(3,067)	(2,108)
Interest rate lock commitments and forward sales commitments | Other assets
Fair values of derivative assets and liabilities recorded in consolidated balance sheets
Fair value recorded in other assets	1,135		1,135		624
Interest rate lock commitments and forward sales commitments | Other liabilities
Fair values of derivative assets and liabilities recorded in consolidated balance sheets
Fair value recorded in other liabilities	1,949		1,949		1,205
Interest rate swap
Derivative Financial Instruments
Aggregate notional amount	407,400		407,400		243,700
Variable rate, commercial loans that are supported by the interest rate swap contracts	203,700		203,700		121,800
Derivative cash pledged					1,000
Derivative securities pledged	12,300		12,300
Gross gains and losses on derivative assets and liabilities recorded in Consolidated Statements of Income
Net gains (losses)	0	0	0	0
Interest rate swap | Non-interest income
Gross gains and losses on derivative assets and liabilities recorded in Consolidated Statements of Income
Gross gains	73	489	164	1,443
Interest rate swap | Non-interest expense
Gross gains and losses on derivative assets and liabilities recorded in Consolidated Statements of Income
Gross (losses)	(73)	$ (489)	(164)	$ (1,443)
Interest rate swap | Other assets
Fair values of derivative assets and liabilities recorded in consolidated balance sheets
Fair value recorded in other assets	11,948		11,948		1,438
Interest rate swap | Other liabilities
Fair values of derivative assets and liabilities recorded in consolidated balance sheets
Fair value recorded in other liabilities	$ 11,948		$ 11,948		$ 1,438