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Fair Value Measurement (Tables)
 9 Months Ended
Sep. 30, 2021
Fair Value Disclosures [Abstract]  
Recorded Amount of Assets and Liabilities Measured at Fair Value on Recurring Basis
The table below presents the recorded amount of assets and liabilities measured at fair value on a recurring basis (in thousands):
Fair value at September 30, 2021TotalLevel 1Level 2Level 3
Marketable equity securities$2,965 $2,965 
Debt securities available for sale:
Obligations of U.S. government corporations and agencies1,244,616 1,244,616 
Obligations of states and political subdivisions168,107 168,107 
Corporate bonds6,796 6,796 
Asset backed securities676,302 676,302 
Loans held for sale3,072 3,072 
Mortgage servicing rights5,736 5,736 
Total assets measured at fair value$2,107,594 $2,965 $2,098,893 $5,736 
Fair value at December 31, 2020TotalLevel 1Level 2Level 3
Marketable equity securities$3,025 $3,025 $— $— 
Debt securities available for sale:
Obligations of U.S. government corporations and agencies812,374 — 812,374 — 
Obligations of states and political subdivisions129,095 — 129,095 — 
Corporate bonds2,544 — 2,544 — 
Asset backed securities470,251 — 470,251 — 
Loans held for sale6,268 — 6,268 — 
Mortgage servicing rights5,092 — — 5,092 
Total assets measured at fair value$1,428,649 $3,025 $1,420,532 $5,092 
Reconciliation of Assets and Liabilities Measured at Fair Value Using Significant Unobservable Inputs (Level 3) on Recurring Basis
The following table provides a reconciliation of assets and liabilities measured at fair value using significant unobservable inputs (Level 3) on a recurring basis during the time periods indicated. Had there been any transfer into or out of Level 3 during the time periods indicated, the amount included in the “Transfers into (out of) Level 3” column would represent the beginning balance of an item in the period (interim quarter) during which it was transferred (in thousands):
Three months ended September 30,Beginning
Balance		Transfers
into (out of)
Level 3		Change
Included
in Earnings		IssuancesEnding
Balance
2021: Mortgage servicing rights$5,603 — $(233)$366 $5,736 
2020: Mortgage servicing rights$4,250 — $236 $434 $4,920 
Nine months ended September 30,Beginning
Balance		Transfers
into (out of)
Level 3		Change
Included
in Earnings		IssuancesEnding
Balance
2021: Mortgage servicing rights$5,092 $(691)$1,335 $5,736 
2020: Mortgage servicing rights$6,200 — $(2,258)$978 $4,920 
Quantitative Information about Recurring Level 3 Fair Value Measurements The following table presents quantitative information about recurring Level 3 fair value measurements at September 30, 2021 and December 31, 2020:
As of September 30, 2021:Fair Value
(in thousands)		Valuation
Technique		Unobservable
Inputs		Range,
Weighted
Average
Mortgage Servicing Rights$5,736 Discounted cash flowConstant prepayment rate
12% - 17%; 13.3%
Discount rate
10% - 14%; 12%
As of December 31, 2020:
Mortgage Servicing Rights$5,092 Discounted cash flowConstant prepayment rate
14% - 20.0%; 17.6%
Discount rate
10% - 14%; 12%
Assets and Liabilities Measured at Fair Value on Nonrecurring Basis
The tables below present the recorded investment in assets and liabilities measured at fair value on a nonrecurring basis, as of the dates indicated (in thousands):
September 30, 2021TotalLevel 1Level 2Level 3Total Gains (Losses)
Fair value:
Individually evaluated loans$2,942 — — $2,942 $(840)
Foreclosed assets447 — — 447 113 
Total assets measured at fair value$3,389 $— $— $3,389 $(727)
December 31, 2020TotalLevel 1Level 2Level 3Total Gains (Losses)
Fair value:
Individually evaluated loans$1,424 — — $1,424 $(1,489)
Foreclosed assets979 — — 979 155 
Total assets measured at fair value$2,403 — — $2,403 $(1,334)

September 30, 2020TotalLevel 1Level 2Level 3Total Losses
Fair value:
Individually evaluated loans$1,024 — — $1,024 $(309)
Quantitative Information about Level 3 Fair Value Measurements for Financial Instruments Measured at Fair Value on Nonrecurring Basis
The following table presents quantitative information about Level 3 fair value measurements for financial instruments measured at fair value on a nonrecurring basis at September 30, 2021:
September 30, 2021Fair Value
(in thousands)		Valuation
Technique		Unobservable InputsRange,
Weighted Average
Individually evaluated loans$2,942 Sales comparison
approach
Income approach		Adjustment for differences between
comparable sales;
Capitalization rate		Not meaningful
N/A
Foreclosed assets (Residential real estate)$447 Sales comparison
approach		Adjustment for differences between
comparable sales
Not meaningful
N/A
The following table presents quantitative information about Level 3 fair value measurements for financial instruments measured at fair value on a nonrecurring basis at December 31, 2020:
December 31, 2020Fair Value
(in thousands)		Valuation
Technique		Unobservable InputsRange,
Weighted Average
Individually evaluated loans$1,424 Sales comparison
approach
Income approach		Adjustment for differences between
comparable sales;
Capitalization rate
Not meaningful
N/A
Foreclosed assets (Residential real estate)$979 Sales comparison
approach		Adjustment for differences between
comparable sales
Not meaningful
N/A
Estimated Fair Values of Financial Instruments that are Reported at Amortized Cost in Consolidated Balance Sheets
September 30, 2021December 31, 2020
(in thousands)Carrying
Amount		Fair
Value		Carrying
Amount		Fair
Value
Financial assets:
Level 1 inputs:
Cash and due from banks$83,188 $83,188 $77,253 $77,253 
Cash at Federal Reserve and other banks657,048 657,048 592,298 592,298 
Level 2 inputs:
Securities held to maturity216,979 228,174 284,563 298,726 
Restricted equity securities17,250 N/A17,250 N/A
Level 3 inputs:
Loans, net4,803,190 4,808,023 4,671,280 4,753,027 
Financial liabilities:
Level 2 inputs:
Deposits7,236,822 7,243,986 6,505,934 6,507,235 
Other borrowings45,601 45,601 26,914 26,914 
Level 3 inputs:
Junior subordinated debt57,965 57,907 57,635 56,632 
(in thousands)Contract
Amount		Fair
Value		Contract
Amount		Fair
Value
Off-balance sheet:
Level 3 inputs:
Commitments$1,531,412 $15,314 $1,426,827 $14,268 
Standby letters of credit23,207 232 15,056 151 
Overdraft privilege commitments111,980 1,119 110,813 1,108