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Fair Market Value of Financial Assets and Liabilities, Estimated Fair Value of Financial Instruments and Indication of Level Within Fair Value Hierarchy of Valuation Techniques (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Financial assets [Abstract]
Debt securities available-for-sale	$ 949,089	$ 599,844
Debt securities held-to-maturity	0	517
Equity securities at fair value	2,212	1,953
Federal Reserve Bank stock	4,887	4,887
Mortgage servicing rights	3,109	3,263
Carrying Amount [Member]
Financial assets [Abstract]
Cash and cash equivalents	257,768	264,683
Certificates of deposits in other banks	245	245
Debt securities available-for-sale	949,089	599,844
Debt securities held-to-maturity		517
Equity securities at fair value	2,212	1,953
Loans held for sale	20,125	1,167
Loans, net	3,509,913	3,213,568
Federal Home Loan Bank stock	10,123	10,474
Federal Reserve Bank stock	4,887	4,887
Accrued interest receivable	14,714	14,836
Mortgage servicing rights	3,109	3,263
Financial liabilities [Abstract]
Deposits	3,894,181	3,405,572
Repurchase agreements	367,788	226,917
Federal funds purchased	2,400	7,906
Advances from Federal Home Loan Bank	400	415
Long-term debt	57,841	57,841
Accrued interest payable	5,179	2,839
Unrecognized financial instruments [Abstract]
Letters of credit	0	0
Commitments to extend credit	0	0
Forward sale commitments	0	0
Fair Value [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Financial assets [Abstract]
Cash and cash equivalents	257,768	264,683
Certificates of deposits in other banks	0	0
Debt securities available-for-sale	3,100	54,263
Debt securities held-to-maturity		0
Equity securities at fair value	0	0
Loans held for sale	20,581	1,191
Loans, net	0	0
Federal Home Loan Bank stock	0	0
Federal Reserve Bank stock	0	0
Accrued interest receivable	0	0
Mortgage servicing rights	0	0
Financial liabilities [Abstract]
Deposits	1,103,863	865,760
Repurchase agreements	0	0
Federal funds purchased	0	0
Advances from Federal Home Loan Bank	0	0
Long-term debt	0	0
Accrued interest payable	0	0
Unrecognized financial instruments [Abstract]
Letters of credit	0	0
Commitments to extend credit	0	0
Forward sale commitments	0	0
Fair Value [Member] | Significant Other Observable Inputs (Level 2) [Member]
Financial assets [Abstract]
Cash and cash equivalents	0	0
Certificates of deposits in other banks	245	245
Debt securities available-for-sale	945,989	545,581
Debt securities held-to-maturity		517
Equity securities at fair value	0	0
Loans held for sale	0	0
Loans, net	0	0
Federal Home Loan Bank stock	10,123	10,474
Federal Reserve Bank stock	4,887	4,887
Accrued interest receivable	14,714	14,836
Mortgage servicing rights	0	0
Financial liabilities [Abstract]
Deposits	2,824,616	2,560,271
Repurchase agreements	0	0
Federal funds purchased	2,400	7,906
Advances from Federal Home Loan Bank	440	446
Long-term debt	0	0
Accrued interest payable	5,179	2,839
Unrecognized financial instruments [Abstract]
Letters of credit	0	0
Commitments to extend credit	0	0
Forward sale commitments	0	0
Fair Value [Member] | Significant Unobservable Inputs (Level 3) [Member]
Financial assets [Abstract]
Cash and cash equivalents	0	0
Certificates of deposits in other banks	0	0
Debt securities available-for-sale	0	0
Debt securities held-to-maturity		0
Equity securities at fair value	2,212	1,953
Loans held for sale	0	0
Loans, net	3,641,439	3,283,876
Federal Home Loan Bank stock	0	0
Federal Reserve Bank stock	0	0
Accrued interest receivable	0	0
Mortgage servicing rights	3,109	3,263
Financial liabilities [Abstract]
Deposits	0	0
Repurchase agreements	367,533	226,921
Federal funds purchased	0	0
Advances from Federal Home Loan Bank	0	0
Long-term debt	39,603	49,382
Accrued interest payable	0	0
Unrecognized financial instruments [Abstract]
Letters of credit	0	0
Commitments to extend credit	0	0
Forward sale commitments	$ 0	$ 0

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- Definition

This item represents management's methodology (for example, procedures or techniques) for estimating the fair value as of the balance sheet date of the financial instrument (as defined), including financial assets and financial liabilities (collectively, as defined).

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Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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Federal Reserve Bank stock represents an equity interest in the Federal Reserve Bank. It does not have a readily determinable fair value because its ownership is restricted and it lacks a market (liquidity).

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Fair value of investment in debt security measured at amortized cost (held-to-maturity).

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