Loan Servicing - Originated Mortgage Servicing Rights (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Servicing Asset at Fair Value, Amount [Roll Forward]
Balances, January 1	$ 15,046	$ 12,876	$ 12,189
Servicing rights capitalized	5,530	3,547	1,883
Amortization of servicing rights	(2,932)	(1,377)	(1,196)
Balances, December 31	17,644	15,046	12,876
Balances, January 1	(719)	(527)	(587)
Additions	(5,106)	(234)	(78)
Reductions	653	42	138
Balances, December 31	(5,172)	(719)	(527)
Mortgage servicing rights, net	$ 12,472	$ 14,327	$ 12,349

The periodic amortization (in proportion to and over the period of estimated net servicing income or loss) of capitalized servicing rights, which contractually entitle the servicer to receive fees and ancillary revenues for performing billing, collection, disbursement and recordkeeping services in connection with a mortgage portfolio. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 50
-Section 50
-Paragraph 4
-Subparagraph (a)(4)
-URI http://asc.fasb.org/extlink&oid=116651436&loc=d3e122739-111746

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