Allowance for Loan Losses - Loans by Credit Quality Indicators - Performing and Non-Performing (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Allowance for loan losses
Loans	$ 1,075,641	$ 1,062,120
Consumer Finance
Allowance for loan losses
Loans	299,592	296,154
Consumer Finance \| Performing
Allowance for loan losses
Loans	299,072	295,442
Consumer Finance \| Nonperforming
Allowance for loan losses
Loans	$ 520	$ 712

Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=82891408&loc=d3e4428-111522

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5074-111524

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant