Fair Value Measurement of Assets and Liabilities - Schedule of Assets and Liabilities Measured at Fair Value on Recurring and Non-Recurring Basis (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Assets
Equity securities	$ 29,378	$ 41,410
Available for sale debt securities	1,339,473	1,566,801
Liabilities
Foreclosed assets	5,100	9,400
Loans held for sale (which consist of residential mortgages) carried at fair value	286,400	74,500
U.S. Treasury securities
Assets
Available for sale debt securities	51,393	50,943
U.S. government agency securities
Assets
Available for sale debt securities	26,157	29,243
Obligations of states and political subdivisions
Assets
Available for sale debt securities	79,950	170,051
Residential mortgage-backed securities
Assets
Available for sale debt securities	1,090,022	1,254,786
Corporate and other debt securities
Assets
Available for sale debt securities	91,951	61,778
Quoted Prices in Active Markets for Identical Assets (Level 1) \| Recurring fair value measurements:
Assets
Equity securities	18,600	41,410
Available for sale debt securities	51,393	50,943
Loans held for sale	0	0
Other assets	0	0
Total assets	69,993	92,353
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
Assets
Available for sale debt securities	51,393	50,943
Quoted Prices in Active Markets for Identical Assets (Level 1) \| Recurring fair value measurements: \| U.S. government agency securities
Assets
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
Assets
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
Assets
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
Assets
Available for sale debt securities	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) \| Non-recurring fair value measurements:
Liabilities
Collateral dependent loans	0	0
Loan servicing rights	0	0
Foreclosed assets	0	0
Total	0	0
Significant Other Observable Inputs (Level 2) \| Recurring fair value measurements:
Assets
Equity securities	0	0
Available for sale debt securities	1,287,265	1,515,178
Loans held for sale	301,427	76,113
Other assets	387,452	158,532
Total assets	1,976,144	1,749,823
Liabilities
Other liabilities	156,281	43,926
Total liabilities	156,281	43,926
Significant Other Observable Inputs (Level 2) \| Recurring fair value measurements: \| U.S. Treasury securities
Assets
Available for sale debt securities	0	0
Significant Other Observable Inputs (Level 2) \| Recurring fair value measurements: \| U.S. government agency securities
Assets
Available for sale debt securities	26,157	29,243
Significant Other Observable Inputs (Level 2) \| Recurring fair value measurements: \| Obligations of states and political subdivisions
Assets
Available for sale debt securities	79,135	169,371
Significant Other Observable Inputs (Level 2) \| Recurring fair value measurements: \| Residential mortgage-backed securities
Assets
Available for sale debt securities	1,090,022	1,254,786
Significant Other Observable Inputs (Level 2) \| Recurring fair value measurements: \| Corporate and other debt securities
Assets
Available for sale debt securities	91,951	61,778
Significant Other Observable Inputs (Level 2) \| Non-recurring fair value measurements:
Liabilities
Collateral dependent loans	0	0
Loan servicing rights	0	0
Foreclosed assets	0	0
Total	0	0
Significant Unobservable Inputs (Level 3) \| Recurring fair value measurements:
Assets
Equity securities	0	0
Available for sale debt securities	815	680
Loans held for sale	0	0
Other assets	0	0
Total assets	815	680
Liabilities
Other liabilities	0	0
Total liabilities	0	0
Significant Unobservable Inputs (Level 3) \| Recurring fair value measurements: \| U.S. Treasury securities
Assets
Available for sale debt securities	0	0
Significant Unobservable Inputs (Level 3) \| Recurring fair value measurements: \| U.S. government agency securities
Assets
Available for sale debt securities	0	0
Significant Unobservable Inputs (Level 3) \| Recurring fair value measurements: \| Obligations of states and political subdivisions
Assets
Available for sale debt securities	815	680
Significant Unobservable Inputs (Level 3) \| Recurring fair value measurements: \| Residential mortgage-backed securities
Assets
Available for sale debt securities	0	0
Significant Unobservable Inputs (Level 3) \| Recurring fair value measurements: \| Corporate and other debt securities
Assets
Available for sale debt securities	0	0
Significant Unobservable Inputs (Level 3) \| Non-recurring fair value measurements:
Liabilities
Collateral dependent loans	35,228	39,075
Loan servicing rights	15,603	1,591
Foreclosed assets	7,387	10,807
Total	58,218	51,473
Fair Value Measured at Net Asset Value Per Share
Assets
Equity securities	7,800
Fair Value \| Recurring fair value measurements:
Assets
Equity securities	26,379	41,410
Available for sale debt securities	1,339,473	1,566,801
Loans held for sale	301,427	76,113
Other assets	387,452	158,532
Total assets	2,054,731	1,842,856
Liabilities
Other liabilities	156,281	43,926
Total liabilities	156,281	43,926
Fair Value \| Recurring fair value measurements: \| U.S. Treasury securities
Assets
Available for sale debt securities	51,393	50,943
Fair Value \| Recurring fair value measurements: \| U.S. government agency securities
Assets
Available for sale debt securities	26,157	29,243
Fair Value \| Recurring fair value measurements: \| Obligations of states and political subdivisions
Assets
Available for sale debt securities	79,950	170,051
Fair Value \| Recurring fair value measurements: \| Residential mortgage-backed securities
Assets
Available for sale debt securities	1,090,022	1,254,786
Fair Value \| Recurring fair value measurements: \| Corporate and other debt securities
Assets
Available for sale debt securities	91,951	61,778
Fair Value \| Non-recurring fair value measurements:
Liabilities
Collateral dependent loans	35,228	39,075
Loan servicing rights	15,603	1,591
Foreclosed assets	7,387	10,807
Total	58,218	51,473
Fair Value \| Significant Unobservable Inputs (Level 3)
Assets
Equity securities	$ 2,999	$ 0

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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 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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Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

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Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

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Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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Fair value of asset after deduction of liability.

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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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Fair value of financial and nonfinancial obligations.

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Fair value portion of loans held-for-sale including, but not limited to, mortgage loans and finance receivables.

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Fair value of an asset representing net future revenue from contractually specified servicing fees, late charges, and other ancillary revenues, in excess of future costs related to servicing arrangements.

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Fair value of the collateral dependent impaired loans.

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