Other Real Estate Owned and Repossessed Assets (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Changes in other real estate owned
Balance at the beginning of the period		$ 8,182	$ 16,812	$ 9,716
Additions due to acquisitions				13,227
Other additions		7,179	6,905	9,938
Net payments received		(249)	(1,064)	(1,560)
Disposals		(7,825)	(12,831)	(13,873)
Write-downs		(1,266)	(1,640)	(636)
Balance at the end of the period		5,832	8,182	16,812
Changes in repossessed assets
Balance at the beginning of the period		625	375	219
Additions due to acquisitions				313
Other additions		4,307	4,641	3,032
Net payments received		0	0	(763)
Disposals		(4,508)	(4,391)	(2,426)
Write-downs		0	0	0
Balance at the end of the period		424	625	375
Other Real Estate, Transfers Out (In)		(189)
Repossessed Assets, Transfers Out (In)		0
Cumulative effect adjustment of change in accounting policy, net of tax impact	[1]		1,339	3,659
Accounting Standards Update 2014-09
Changes in repossessed assets
Loans and Leases Receivable, Transferred In (Out)		$ 1,100
Retained Earnings
Changes in repossessed assets
Cumulative effect adjustment of change in accounting policy, net of tax impact	[1]		1,680	$ 3,659
Retained Earnings | Accounting Standards Update 2014-09
Changes in repossessed assets
Cumulative effect adjustment of change in accounting policy, net of tax impact			$ 900

[1] Refer to Note 1, Summary of Significant Accounting Policies, Note 4, Investment Securities, Note 7, Other Real Estate Owned and Repossessed Assets and Note 9, Loan Servicing Rights, for further details on the changes in accounting policy.