Fair Value of Financial Instruments - Recurring Level III Assets (Details) - Level III - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	$ 34,628	$ 31,448	$ 35,172	$ 25,235
Realized and unrealized gains (losses) included in earnings	(226)	(31)	565	918
Purchase of securities	623	2,000	1,982	8,232
Unrealized gain included in other comprehensive income (loss)	21,153	1,787	27,521	1,541
Unrealized loss included in other comprehensive income (loss)	0	(636)	(9,062)	(1,358)
Ending balance	56,178	34,568	56,178	34,568
Loans receivable \| Interest rate lock commitment
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	2,541	2,375	1,750	1,426
Realized and unrealized gains (losses) included in earnings	(226)	(703)	565	246
Purchase of securities	0	0	0	0
Unrealized gain included in other comprehensive income (loss)	0	0	0	0
Unrealized loss included in other comprehensive income (loss)	0	0	0	0
Ending balance	2,315	1,672	2,315	1,672
Municipal Securities \| Municipal Securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	30,537	28,173	33,122	22,909
Realized and unrealized gains (losses) included in earnings	0	0	0	0
Purchase of securities	573	0	682	6,232
Unrealized gain included in other comprehensive income (loss)	4,339	1,787	10,707	1,541
Unrealized loss included in other comprehensive income (loss)	0	(636)	(9,062)	(1,358)
Ending balance	35,449	29,324	35,449	29,324
Equity securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	1,550	900	300	900
Realized and unrealized gains (losses) included in earnings	0	672	0	672
Purchase of securities	50	2,000	1,300	2,000
Unrealized gain included in other comprehensive income (loss)	16,814	0	16,814	0
Unrealized loss included in other comprehensive income (loss)	0	0	0	0
Ending balance	$ 18,414	$ 3,572	$ 18,414	$ 3,572

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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- Definition

Amount of gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258

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- Definition

Amount of gain (loss) recognized in other comprehensive income (OCI) from asset measured at fair value on recurring basis using unobservable input (level 3).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
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- Definition

Amount of purchases of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

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-Publisher FASB
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- Definition

Fair value of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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- Definition

Amount of gain (loss) recognized in other comprehensive income (OCI) from liability measured at fair value on recurring basis using unobservable input (level 3).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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