Borrowings (Schedule of Borrowings) (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
Mar. 31, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Total borrowings, gross	$ 404,900	$ 303,430
Weighted average interest rate	1.16%	2.12%
Unamortized discount on acquired borrowings	$ (2,715)	$ (2,759)
Total borrowings	402,185	300,671
Federal Home Loan Bank Term Note due January 2020
Debt Instrument [Line Items]
Total borrowings, gross		$ 100,000
Weighted average interest rate		1.70%
Federal Home Loan Bank Term Note due January 2020
Debt Instrument [Line Items]
Total borrowings, gross		$ 68,000
Weighted average interest rate		1.70%
Federal Home Loan Bank Term Note due January 2020
Debt Instrument [Line Items]
Total borrowings, gross		$ 30,000
Weighted average interest rate		1.70%
Federal Home Loan Bank Term Note due April 2020
Debt Instrument [Line Items]
Total borrowings, gross	$ 50,000
Weighted average interest rate	1.01%
Federal Home Loan Bank Term Note due May 2020
Debt Instrument [Line Items]
Total borrowings, gross	$ 50,000
Weighted average interest rate	0.88%
Federal Home Loan Bank Term Note due May 2020
Debt Instrument [Line Items]
Total borrowings, gross	$ 40,000	$ 40,000
Weighted average interest rate	1.62%	1.62%
Federal Home Loan Bank Term Note due June 2020
Debt Instrument [Line Items]
Total borrowings, gross	$ 50,000
Weighted average interest rate	0.71%
Federal Home Loan Bank Term Note due June 2020
Debt Instrument [Line Items]
Total borrowings, gross	$ 50,000
Weighted average interest rate	0.41%
Federal Home Loan Bank Term Note due September 2020
Debt Instrument [Line Items]
Total borrowings, gross	$ 50,000
Weighted average interest rate	0.64%
Federal Home Loan Bank Term Note due September 2020
Debt Instrument [Line Items]
Total borrowings, gross	$ 50,000
Weighted average interest rate	0.50%
Federal Home Loan Bank Principal Reducing Credit due July 2023
Debt Instrument [Line Items]
Total borrowings, gross	$ 158	$ 168
Weighted average interest rate	1.00%	1.00%
Federal Home Loan Bank Principal Reducing Credit due December 2023
Debt Instrument [Line Items]
Total borrowings, gross	$ 1,020	$ 1,029
Weighted average interest rate	1.25%	1.25%
Federal Home Loan Bank Principal Reducing Credit due January 2026
Debt Instrument [Line Items]
Total borrowings, gross	$ 6,000	$ 6,500
Weighted average interest rate	1.98%	1.98%
Federal Home Loan Bank Principal Reducing Credit due June 2028
Debt Instrument [Line Items]
Total borrowings, gross	$ 242	$ 245
Weighted average interest rate	0.25%	0.25%
Federal Home Loan Bank Principal Reducing Credit due July 2028
Debt Instrument [Line Items]
Total borrowings, gross	$ 54	$ 55
Weighted average interest rate	0.00%	0.00%
Federal Home Loan Bank Principal Reducing Credit due August 2028
Debt Instrument [Line Items]
Total borrowings, gross	$ 179	$ 181
Weighted average interest rate	1.00%	1.00%
Federal Home Loan Bank Principal Reducing Credit due August 2028
Debt Instrument [Line Items]
Total borrowings, gross	$ 179	$ 181
Weighted average interest rate	1.00%	1.00%
Federal Home Loan Bank Principal Reducing Credit due December 2028
Debt Instrument [Line Items]
Total borrowings, gross	$ 364	$ 367
Weighted average interest rate	0.50%	0.50%
Trust Preferred Securities due January 2034
Debt Instrument [Line Items]
Total borrowings, gross	$ 20,620	$ 20,620
Weighted average interest rate	4.47%	4.64%
Basis spread on variable rate	2.70%	2.70%
Trust Preferred Securities due June 2036
Debt Instrument [Line Items]
Total borrowings, gross	$ 25,774	$ 25,774
Weighted average interest rate	2.13%	3.28%
Basis spread on variable rate	1.39%	1.39%
Trust Preferred Securities due January 2035
Debt Instrument [Line Items]
Total borrowings, gross	$ 10,310	$ 10,310
Weighted average interest rate	3.28%	3.99%
Basis spread on variable rate	2.00%	2.00%

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

No definition available.

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- Definition

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (b)(1)
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-Section S99
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-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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Balance Type:	credit
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- 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

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- Definition

Amount, after accumulated amortization, of debt discount.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 1A
-URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28541-108399

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- Definition

Weighted average interest rate of debt outstanding.

+ References

No definition available.

+ Details

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- Definition

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (b)(3)
-URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031897-161870

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 210
-Section S99
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-URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910

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-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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