Accounting Standards Updates and Recently Adopted Standards - Narrative (Details) $ in Thousands	Jan. 01, 2020 USD ($) portfolio	Dec. 31, 2019 USD ($)	Jan. 01, 2019 USD ($)	Jan. 01, 2017 USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Right-of-use asset		$ 19,900
Lease liability		$ 22,039
Effect on retained earnings in period of adoption			$ (549)	$ 437
ASU No. 2016-13 | Forecast
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Increase in allowance for credit losses	$ 8,750
Increase reclassified from fair value mark for PCD financial assets previously classified as PCI	$ 3,590
Number of portfolios in allowance calculation | portfolio	14
Effect on retained earnings in period of adoption	$ 3,530
ASU No. 2016-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Right-of-use asset			23,800
Lease liability			26,800
Effect on retained earnings in period of adoption			$ 549
Loans | ASU No. 2016-13 | Forecast
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Increase in allowance for credit losses	6,880
Unfunded commitments | ASU No. 2016-13 | Forecast
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Increase in allowance for credit losses	$ 1,870