Derivative Financial Instruments - Notional amounts and fair values of derivative financial instruments (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Derivative Financial Instruments
Notional Amount	$ 401,432	$ 139,615
Asset (Liability) Fair Value	1,139	185
Interest rate lock commitments
Derivative Financial Instruments
Notional Amount	280,286	70,323
Asset (Liability) Fair Value	3,689	347
Interest rate lock commitments \| Other Assets
Derivative Financial Instruments
Notional Amount	240,696	47,660
Asset (Liability) Fair Value	4,021	504
Interest rate lock commitments \| Other Liabilities
Derivative Financial Instruments
Notional Amount	39,590	22,663
Asset (Liability) Fair Value	(332)	(157)
Forward Commitments
Derivative Financial Instruments
Notional Amount	108,500	62,750
Asset (Liability) Fair Value	(2,424)	(113)
Forward Commitments \| Other Assets
Derivative Financial Instruments
Notional Amount		4,500
Asset (Liability) Fair Value		6
Forward Commitments \| Other Liabilities
Derivative Financial Instruments
Notional Amount	108,500	58,250
Asset (Liability) Fair Value	(2,424)	(119)
Customer derivatives - Interest rate swaps
Derivative Financial Instruments
Notional Amount	12,646	6,542
Asset (Liability) Fair Value	(126)	(49)
Customer derivatives - Interest rate swaps \| Other Assets
Derivative Financial Instruments
Notional Amount	6,323	3,271
Asset (Liability) Fair Value	1,057	382
Customer derivatives - Interest rate swaps \| Other Liabilities
Derivative Financial Instruments
Notional Amount	6,323	3,271
Asset (Liability) Fair Value	$ (1,183)	$ (431)

Fair values as of the balance sheet date of the net amount of all assets and liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=117331979&loc=d3e41228-113958

+ Details

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

- Definition

Nominal or face amount used to calculate payment on derivative.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5580258-113959

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5579245-113959

+ Details

Name:	us-gaap_DerivativeNotionalAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_DerivativesFairValueLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_InterestRateLockCommitmentsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_BalanceSheetLocationAxis=us-gaap_OtherAssetsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_BalanceSheetLocationAxis=us-gaap_OtherLiabilitiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_ForwardContractsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_InterestRateSwapMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: