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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.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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Amount of advances or credit lines available from the Federal Home Loan Bank (FHLB).

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Amount of the collateral pledged in support of federal home loan bank advances outstanding.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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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.

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The noncurrent portion of Federal Home Loan Bank borrowings initially due beyond one year or beyond the normal operating cycle if longer.

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Fair value of securities pledged as collateral against securities sold under agreement to repurchase.

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Reflects the total carrying amount as of the balance sheet date of debt having initial terms less than one year or the normal operating cycle, if longer.

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Borrowings and Subordinated Debt (Additional Information) (Details) - USD ($)		9 Months Ended
	Dec. 18, 2019	Sep. 30, 2020	Dec. 31, 2019	Dec. 21, 2015
Short-term Debt [Line Items]
Total short-term borrowings		$ 187,000	$ 65,851,000
Debt Instrument [Line Items]
Subordinated notes		261,177,000	190,814,000
FHLB advances		181,000,000.0
Federal Home Loan Bank, advances, collateral		510,600,000
Federal Home Loan Bank, advances, maximum borrowing capacity		211,100,000
Maturity overnight
Short-term Debt [Line Items]
Fair value of collateralized mortgage obligations		1,900,000
FHLB line of credit \| Unsecured borrowings
Debt Instrument [Line Items]
Maximum borrowing capacity		122,500,000
Secured borrowing due in 2022 \| Secured borrowing due in 2022
Debt Instrument [Line Items]
Subordinated notes		$ 1,322,000	1,374,000
Fixed interest rate		1.00%
Subordinated notes
Debt Instrument [Line Items]
Fixed interest rate	4.75%			6.375%
Long-term debt gross	$ 30,000,000.0			$ 15,000,000.0
Subordinated notes \| SOFR
Debt Instrument [Line Items]
Basis spread on variable rate	311.00%
Subordinated notes \| Subordinated notes due in 2025
Debt Instrument [Line Items]
Long-term debt gross		$ 45,000,000.0	45,000,000.0
Debt issuance costs		$ 445,000	560,000
Subordinated notes \| Subordinated notes due in 2025 \| LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate		477.00%
Unsecured borrowings \| FRB borrowings
Debt Instrument [Line Items]
Subordinated notes		$ 34,098,000	0
Fixed interest rate		0.35%
Federal funds purchased
Short-term Debt [Line Items]
Total short-term borrowings		$ 0	5,000,000
Securities sold under agreements to repurchase
Short-term Debt [Line Items]
Total short-term borrowings		187,000	$ 851,000
Securities sold under agreements to repurchase \| Maturity overnight
Short-term Debt [Line Items]
Total short-term borrowings		187,000
Federal Reserve Bank \| FHLB line of credit \| Secured borrowing due in 2022
Debt Instrument [Line Items]
Maximum borrowing capacity		$ 5,300,000