Commitments - Financial Instruments Whose Contract Amounts Represent Credit Risk (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Loss Contingencies [Line Items]
Other Commitments	$ 102,374	$ 88,518
Commitments to Grant Loans
Loss Contingencies [Line Items]
Other Commitments	15,447	14,236
Unfunded Commitments Under Line of Credit
Loss Contingencies [Line Items]
Other Commitments	86,414	74,123
Standby letters of credit
Loss Contingencies [Line Items]
Other Commitments	$ 513	$ 159

Minimum amount of other commitment not otherwise specified in the taxonomy. Excludes commitments explicitly modeled in the taxonomy, including but not limited to, long-term and short-term purchase commitments, recorded and unrecorded purchase obligations, supply commitments, registration payment arrangements, leases, debt, product warranties, guarantees, environmental remediation obligations, and pensions.

No definition available.

Name:	us-gaap_OtherCommitment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant