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Accounting Standards Updates Accounting Standards Updates (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jan. 01, 2018
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Retained earnings   $ 294,553   $ 294,553   $ 265,007
Noninterest income   $ 21,158 $ 17,450 $ 38,988 $ 34,690  
Accounting Standards Update 2014-09            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Cumulative effect of new accounting principle           1,780
Accounting Standards Update 2016-01            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Cumulative effect of new accounting principle $ 65         0
Accounting Standards Update 2018-02            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Reclassified from AOCI to retained earnings due to Tax Cuts and Jobs Act           $ 10,000
Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Retained earnings 1,800          
Contingent commissions | Insurance Business Segment | Difference between Revenue Guidance in Effect before and after Topic 606            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Noninterest income $ 1,800