Fair Value Measurement of Assets and Liabilities - Recurring and Non-Recurring Basis (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Investment securities:
Equity securities	$ 32,973	$ 29,378
Available for sale:
Available for sale debt securities	1,116,221	1,339,473
Non-recurring fair value measurements:
Unpaid principal balances of loans held for sale	226,600	286,400
U.S. Treasury securities
Available for sale:
Available for sale debt securities	51,199	51,393
U.S. government agency securities
Available for sale:
Available for sale debt securities	24,010	26,157
Obligations of states and political subdivisions
Available for sale:
Available for sale debt securities	72,722	79,950
Residential mortgage-backed securities
Available for sale:
Available for sale debt securities	878,336	1,090,022
Corporate and other debt securities
Available for sale:
Available for sale debt securities	89,954	91,951
Quoted Prices in Active Markets for Identical Assets (Level 1) \| Recurring fair value measurements
Investment securities:
Equity securities	19,742	18,600
Available for sale:
Available for sale debt securities	51,199	51,393
Loans held for sale	0	0
Other assets	0	0
Total assets	70,941	69,993
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:
Available for sale debt securities	51,199	51,393
Quoted Prices in Active Markets for Identical Assets (Level 1) \| Recurring fair value measurements \| U.S. government agency securities
Available for sale:
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:
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:
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:
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	0
Foreclosed assets	0	0
Total	0	0
Significant Other Observable Inputs (Level 2) \| Recurring fair value measurements
Investment securities:
Equity securities	0	0
Available for sale:
Available for sale debt securities	1,064,893	1,287,265
Loans held for sale	232,068	301,427
Other assets	155,633	387,452
Total assets	1,452,594	1,976,144
Liabilities
Other liabilities	22,503	156,281
Total liabilities	22,503	156,281
Significant Other Observable Inputs (Level 2) \| Recurring fair value measurements \| U.S. Treasury securities
Available for sale:
Available for sale debt securities	0	0
Significant Other Observable Inputs (Level 2) \| Recurring fair value measurements \| U.S. government agency securities
Available for sale:
Available for sale debt securities	24,010	26,157
Significant Other Observable Inputs (Level 2) \| Recurring fair value measurements \| Obligations of states and political subdivisions
Available for sale:
Available for sale debt securities	72,593	79,135
Significant Other Observable Inputs (Level 2) \| Recurring fair value measurements \| Residential mortgage-backed securities
Available for sale:
Available for sale debt securities	878,336	1,090,022
Significant Other Observable Inputs (Level 2) \| Recurring fair value measurements \| Corporate and other debt securities
Available for sale:
Available for sale debt securities	89,954	91,951
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	0
Foreclosed assets	0	0
Total	0	0
Significant Unobservable Inputs (Level 3) \| Recurring fair value measurements
Investment securities:
Equity securities	0	0
Available for sale:
Available for sale debt securities	129	815
Loans held for sale	0	0
Other assets	0	0
Total assets	129	815
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:
Available for sale debt securities	0	0
Significant Unobservable Inputs (Level 3) \| Recurring fair value measurements \| U.S. government agency securities
Available for sale:
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:
Available for sale debt securities	129	815
Significant Unobservable Inputs (Level 3) \| Recurring fair value measurements \| Residential mortgage-backed securities
Available for sale:
Available for sale debt securities	0	0
Significant Unobservable Inputs (Level 3) \| Recurring fair value measurements \| Corporate and other debt securities
Available for sale:
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	38,883	35,228
Loan servicing rights	682	15,603
Foreclosed assets	1,683	7,387
Total	41,248	58,218
NAV
Investment securities:
Equity securities	10,000	7,800
Fair Value \| Recurring fair value measurements
Investment securities:
Equity securities	29,724	26,379
Available for sale:
Available for sale debt securities	1,116,221	1,339,473
Loans held for sale	232,068	301,427
Other assets	155,633	387,452
Total assets	1,533,646	2,054,731
Liabilities
Other liabilities	22,503	156,281
Total liabilities	22,503	156,281
Fair Value \| Recurring fair value measurements \| U.S. Treasury securities
Available for sale:
Available for sale debt securities	51,199	51,393
Fair Value \| Recurring fair value measurements \| U.S. government agency securities
Available for sale:
Available for sale debt securities	24,010	26,157
Fair Value \| Recurring fair value measurements \| Obligations of states and political subdivisions
Available for sale:
Available for sale debt securities	72,722	79,950
Fair Value \| Recurring fair value measurements \| Residential mortgage-backed securities
Available for sale:
Available for sale debt securities	878,336	1,090,022
Fair Value \| Recurring fair value measurements \| Corporate and other debt securities
Available for sale:
Available for sale debt securities	89,954	91,951
Fair Value \| Non-recurring fair value measurements
Non-recurring fair value measurements:
Collateral dependent loans	38,883	35,228
Loan servicing rights	682	15,603
Foreclosed assets	1,683	7,387
Total	41,248	58,218
Fair Value \| Significant Unobservable Inputs (Level 3)
Investment securities:
Equity securities	$ 3,249	$ 2,999

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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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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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 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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