Fair Value of Assets and Liabilities - Schedule Of Assets And Liabilities Measured At Fair Value On A Recurring Basis (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total available for sale securities	$ 297,573	$ 307,019
Total marketable securities	5,527	5,731
Total marketable securities		5,731
Mortgage servicing rights	8,039	7,305
Total other assets	10,146	8,439
Total other liabilities	236	77
Level 1 inputs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total available for sale securities	70,540	53,386
Total marketable securities	5,527
Total marketable securities		5,731
Mortgage servicing rights	0	0
Total other assets	0	0
Total other liabilities	0	0
Level 2 inputs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total available for sale securities	227,033	253,633
Total marketable securities	0
Total marketable securities		0
Mortgage servicing rights	0	0
Total other assets	784	261
Total other liabilities	236	77
Level 3 inputs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total available for sale securities	0	0
Total marketable securities	0
Total marketable securities		0
Mortgage servicing rights	8,039	7,305
Total other assets	9,362	8,178
Total other liabilities	0	0
U.S. Treasury and government sponsored entities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total available for sale securities	243,318	249,461
U.S. Treasury and government sponsored entities | Level 1 inputs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total available for sale securities	49,603	49,878
U.S. Treasury and government sponsored entities | Level 2 inputs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total available for sale securities	193,715	199,583
U.S. Treasury and government sponsored entities | Level 3 inputs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total available for sale securities	0	0
Municipal securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total available for sale securities	13,776	14,421
Municipal securities | Level 1 inputs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total available for sale securities	0	0
Municipal securities | Level 2 inputs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total available for sale securities	13,776	14,421
Municipal securities | Level 3 inputs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total available for sale securities	0	0
Corporate bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total available for sale securities	34,469	37,132
Corporate bonds | Level 1 inputs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total available for sale securities	20,937	3,508
Corporate bonds | Level 2 inputs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total available for sale securities	13,532	33,624
Corporate bonds | Level 3 inputs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total available for sale securities	0	0
Collateralized loan obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total available for sale securities	6,010	6,005
Collateralized loan obligations | Level 1 inputs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total available for sale securities	0	0
Collateralized loan obligations | Level 2 inputs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total available for sale securities	6,010	6,005
Collateralized loan obligations | Level 3 inputs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total available for sale securities	0	0
Preferred stock
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total available for sale securities	5,527
Total marketable securities	5,527
Total marketable securities		5,731
Preferred stock | Level 1 inputs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total marketable securities	5,527
Total marketable securities		5,731
Preferred stock | Level 2 inputs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total marketable securities	0
Total marketable securities		0
Preferred stock | Level 3 inputs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total marketable securities	0
Total marketable securities		0
Interest rate swaps
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative contracts	784	261
Total other liabilities	133	77
Interest rate swaps | Level 1 inputs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative contracts	0	0
Total other liabilities	0	0
Interest rate swaps | Level 2 inputs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative contracts	784	261
Total other liabilities	133	77
Interest rate swaps | Level 3 inputs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative contracts	0	0
Total other liabilities	0	0
Interest rate lock commitments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative contracts	1,323	873
Interest rate lock commitments | Level 1 inputs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative contracts	0	0
Interest rate lock commitments | Level 2 inputs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative contracts	0	0
Interest rate lock commitments | Level 3 inputs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative contracts	1,323	$ 873
Retail interest rate contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total other liabilities	103
Retail interest rate contracts | Level 1 inputs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total other liabilities	0
Retail interest rate contracts | Level 2 inputs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total other liabilities	103
Retail interest rate contracts | Level 3 inputs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total other liabilities	$ 0