Acquisition - Summary (Details) - USD ($) $ in Thousands				12 Months Ended
	Sep. 06, 2019	May 01, 2018	Apr. 03, 2017	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Consideration Received
Payments to Acquire Businesses, Net of Cash Acquired				$ (332,468)	$ (705)	$ (3,188)
Fair Value of Liabilities Assumed
Goodwill, Acquired During Period				$ 29,100
Garfield Acquisition Corp [Member]
Consideration Received
Payments to Acquire Businesses, Net of Cash Acquired		$ 17,400
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable		41,561
Cash received		58,961
Total consideration received		58,961
Fair Value of Assets Acquired
Cash and cash equivalents		18,105
FHLB Stock		3,261
Loans		184,506
Premises and other equipment		409
Core deposit intangible		1,248
Other assets		1,747
Total assets acquired		209,276
Fair Value of Liabilities Assumed
Deposits		141,281
Capital lease obligation		22,988
Other Liabilities		5,068
Total liabilities assumed		169,337
Total Fair Value of Identifiable Net Assets		39,939
Goodwill, Acquired During Period		$ 19,022
Santander Bank, N.A. [Member]
Consideration Received
Payments to Acquire Businesses, Net of Cash Acquired			$ 329,533
Fair Value of Assets Acquired
Cash and cash equivalents	$ 2,935
Loans	99,956
Premises and other equipment	3,637
Core deposit intangible	5,615
Other assets	770
Total assets acquired	112,913
Fair Value of Liabilities Assumed
Deposits	471,386
Other Liabilities	186
Total liabilities assumed	471,572
Total Fair Value of Identifiable Net Assets	(358,659)
Goodwill, Acquired During Period	$ 29,126