Fair Value Measurement of Assets and Liabilities - Recurring and Non-Recurring Basis (Details) - USD ($)	Sep. 30, 2021	Dec. 31, 2020
Investment securities:
Equity securities	$ 36,068,000	$ 29,378,000
Trading debt securities	4,797,000	0
Available for sale debt securities:
Available for sale debt securities	1,208,277,000	1,339,473,000
Non-recurring fair value measurements:
Unpaid principal balances of loans held for sale	152,400,000	286,400,000
U.S. Treasury securities
Available for sale debt securities:
Available for sale debt securities		51,393,000
U.S. government agency securities
Available for sale debt securities:
Available for sale debt securities	21,442,000	26,157,000
Obligations of states and political subdivisions
Available for sale debt securities:
Available for sale debt securities	83,149,000	79,950,000
Residential mortgage-backed securities
Available for sale debt securities:
Available for sale debt securities	992,828,000	1,090,022,000
Corporate and other debt securities
Available for sale debt securities:
Available for sale debt securities	110,858,000	91,951,000
Quoted Prices in Active Markets for Identical Assets (Level 1) \| Recurring fair value measurements
Investment securities:
Equity securities	20,890,000	18,600,000
Trading debt securities	0
Available for sale debt securities:
Available for sale debt securities	0	51,393,000
Loans held for sale	0	0
Other assets	0	0
Total assets	20,890,000	69,993,000
Liabilities
Other liabilities	0	0
Total liabilities	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) \| Recurring fair value measurements \| U.S. Treasury securities
Available for sale debt securities:
Available for sale debt securities		51,393,000
Quoted Prices in Active Markets for Identical Assets (Level 1) \| Recurring fair value measurements \| U.S. government agency securities
Available for sale debt securities:
Available for sale debt securities	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) \| Recurring fair value measurements \| Obligations of states and political subdivisions
Available for sale debt securities:
Available for sale debt securities	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) \| Recurring fair value measurements \| Residential mortgage-backed securities
Available for sale debt securities:
Available for sale debt securities	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) \| Recurring fair value measurements \| Corporate and other debt securities
Available for sale debt securities:
Available for sale debt securities	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) \| Non-recurring fair value measurements
Non-recurring fair value measurements:
Collateral dependent loans	0	0
Loan servicing rights		0
Foreclosed assets	0	0
Total	0	0
Significant Other Observable Inputs (Level 2) \| Recurring fair value measurements
Investment securities:
Equity securities	0	0
Trading debt securities	4,797,000
Available for sale debt securities:
Available for sale debt securities	1,208,277,000	1,287,265,000
Loans held for sale	157,084,000	301,427,000
Other assets	215,919,000	387,452,000
Total assets	1,586,077,000	1,976,144,000
Liabilities
Other liabilities	66,733,000	156,281,000
Total liabilities	66,733,000	156,281,000
Significant Other Observable Inputs (Level 2) \| Recurring fair value measurements \| U.S. Treasury securities
Available for sale debt securities:
Available for sale debt securities		0
Significant Other Observable Inputs (Level 2) \| Recurring fair value measurements \| U.S. government agency securities
Available for sale debt securities:
Available for sale debt securities	21,442,000	26,157,000
Significant Other Observable Inputs (Level 2) \| Recurring fair value measurements \| Obligations of states and political subdivisions
Available for sale debt securities:
Available for sale debt securities	83,149,000	79,135,000
Significant Other Observable Inputs (Level 2) \| Recurring fair value measurements \| Residential mortgage-backed securities
Available for sale debt securities:
Available for sale debt securities	992,828,000	1,090,022,000
Significant Other Observable Inputs (Level 2) \| Recurring fair value measurements \| Corporate and other debt securities
Available for sale debt securities:
Available for sale debt securities	110,858,000	91,951,000
Significant Other Observable Inputs (Level 2) \| Non-recurring fair value measurements
Non-recurring fair value measurements:
Collateral dependent loans	0	0
Loan servicing rights		0
Foreclosed assets	0	0
Total	0	0
Significant Unobservable Inputs (Level 3) \| Recurring fair value measurements
Investment securities:
Equity securities	0	0
Trading debt securities	0
Available for sale debt securities:
Available for sale debt securities	0	815,000
Loans held for sale	0	0
Other assets	0	0
Total assets	0	815,000
Liabilities
Other liabilities	0	0
Total liabilities	0	0
Significant Unobservable Inputs (Level 3) \| Recurring fair value measurements \| U.S. Treasury securities
Available for sale debt securities:
Available for sale debt securities		0
Significant Unobservable Inputs (Level 3) \| Recurring fair value measurements \| U.S. government agency securities
Available for sale debt securities:
Available for sale debt securities	0	0
Significant Unobservable Inputs (Level 3) \| Recurring fair value measurements \| Obligations of states and political subdivisions
Available for sale debt securities:
Available for sale debt securities	0	815,000
Significant Unobservable Inputs (Level 3) \| Recurring fair value measurements \| Residential mortgage-backed securities
Available for sale debt securities:
Available for sale debt securities	0	0
Significant Unobservable Inputs (Level 3) \| Recurring fair value measurements \| Corporate and other debt securities
Available for sale debt securities:
Available for sale debt securities	0	0
Significant Unobservable Inputs (Level 3) \| Non-recurring fair value measurements
Non-recurring fair value measurements:
Collateral dependent loans	68,162,000	35,228,000
Loan servicing rights		15,603,000
Foreclosed assets	2,037,000	7,387,000
Total	70,199,000	58,218,000
NAV
Investment securities:
Equity securities	11,400,000	7,800,000
Fair Value \| Recurring fair value measurements
Investment securities:
Equity securities	32,300,000	26,379,000
Trading debt securities	4,797,000
Available for sale debt securities:
Available for sale debt securities	1,208,277,000	1,339,473,000
Loans held for sale	157,084,000	301,427,000
Other assets	215,919,000	387,452,000
Total assets	1,618,377,000	2,054,731,000
Liabilities
Other liabilities	66,733,000	156,281,000
Total liabilities	66,733,000	156,281,000
Fair Value \| Recurring fair value measurements \| U.S. Treasury securities
Available for sale debt securities:
Available for sale debt securities		51,393,000
Fair Value \| Recurring fair value measurements \| U.S. government agency securities
Available for sale debt securities:
Available for sale debt securities	21,442,000	26,157,000
Fair Value \| Recurring fair value measurements \| Obligations of states and political subdivisions
Available for sale debt securities:
Available for sale debt securities	83,149,000	79,950,000
Fair Value \| Recurring fair value measurements \| Residential mortgage-backed securities
Available for sale debt securities:
Available for sale debt securities	992,828,000	1,090,022,000
Fair Value \| Recurring fair value measurements \| Corporate and other debt securities
Available for sale debt securities:
Available for sale debt securities	110,858,000	91,951,000
Fair Value \| Non-recurring fair value measurements
Non-recurring fair value measurements:
Collateral dependent loans	68,162,000	35,228,000
Loan servicing rights	0	15,603,000
Foreclosed assets	2,037,000	7,387,000
Total	70,199,000	58,218,000
Fair Value \| Significant Unobservable Inputs (Level 3)
Investment securities:
Equity securities	$ 3,768,000	$ 2,999,000

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Amount excluding accrued interest, of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Carrying amount as of the balance sheet date of all assets obtained in full or partial satisfaction of a debt arrangement through foreclosure proceedings or defeasance; includes real and personal property; equity interests in corporations, partnerships, and joint ventures; and beneficial interests in trusts.

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Amount of investment in debt security measured at fair value with change in fair value recognized in net income (trading).

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Fair value of the collateral dependent impaired loans.

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