Recently Issued Accounting Standards, Not Adopted at December 31, 2019 (Details) - USD ($) $ in Thousands	Jan. 01, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Increase in allowance for loan losses		$ 35,154	$ 32,423	$ 27,122	$ 23,400
Ratio percentage of allowance to total loans		0.68%
Forecast | Accounting Standards Update 2016-13
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Decrease in tier one capital ratio	0.32%
Minimum | Forecast | Accounting Standards Update 2016-13
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Increase in allowance for loan losses	$ 19,000
Ratio percentage of allowance to total loans	1.06%
Maximum | Forecast | Accounting Standards Update 2016-13
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Increase in allowance for loan losses	$ 23,000
Ratio percentage of allowance to total loans	1.12%