Fair Value of Financial Instruments - Summary of Estimated Fair Values of Financial Instruments (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Assets
Cash and due from banks	$ 529,336	$ 249,711
Interest–earning time deposits	7,983	8,965
Investment securities, held to maturity	161,650	168,676
Loans held for sale	7,798	13,538
Loans (excluding loan level hedges), net	3,607,250	3,810,356
Stock in FHLB	23,023	23,023
Interest receivable	20,951	21,396
Liabilities
Non–interest bearing deposits	1,133,412	1,053,242
Interest bearing deposits	3,588,404	3,477,891
Borrowings	481,488	475,000
Interest payable	1,772	2,712
Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets
Cash and due from banks	529,336	249,711
Interest–earning time deposits	0	0
Investment securities, held to maturity	0	0
Loans held for sale	0	0
Loans (excluding loan level hedges), net	0	0
Stock in FHLB	0	0
Interest receivable	0	0
Liabilities
Non–interest bearing deposits	1,133,412	1,053,242
Interest bearing deposits	0	0
Borrowings	0	0
Subordinated notes	0	0
Junior subordinated debentures issued to capital trusts	0	0
Interest payable	0	0
Significant Other Observable Inputs (Level 2)
Assets
Cash and due from banks	0	0
Interest–earning time deposits	8,123	9,136
Investment securities, held to maturity	170,949	179,990
Loans held for sale	0	0
Loans (excluding loan level hedges), net	0	0
Stock in FHLB	23,023	23,023
Interest receivable	20,951	21,396
Liabilities
Non–interest bearing deposits	0	0
Interest bearing deposits	3,541,714	3,466,522
Borrowings	481,549	483,245
Subordinated notes	57,756	57,626
Junior subordinated debentures issued to capital trusts	52,924	52,676
Interest payable	1,772	2,712
Significant Unobservable Inputs (Level 3)
Assets
Cash and due from banks	0	0
Interest–earning time deposits	0	0
Investment securities, held to maturity	0	0
Loans held for sale	7,798	13,538
Loans (excluding loan level hedges), net	3,535,694	3,767,348
Stock in FHLB	0	0
Interest receivable	0	0
Liabilities
Non–interest bearing deposits	0	0
Interest bearing deposits	0	0
Borrowings	0	0
Subordinated notes	0	0
Junior subordinated debentures issued to capital trusts	0	0
Interest payable	0	0
Carrying Amount
Assets
Cash and due from banks	529,336	249,711
Interest–earning time deposits	7,983	8,965
Investment securities, held to maturity	161,650	168,676
Loans held for sale	7,798	13,538
Loans (excluding loan level hedges), net	3,607,250	3,810,356
Stock in FHLB	23,023	23,023
Interest receivable	20,951	21,396
Liabilities
Non–interest bearing deposits	1,133,412	1,053,242
Interest bearing deposits	3,588,404	3,477,891
Borrowings	481,488	475,000
Subordinated notes	58,640	58,603
Junior subordinated debentures issued to capital trusts	56,604	56,548
Interest payable	$ 1,772	$ 2,712

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For banks and other depository institutions: Includes cash on hand (currency and coin), cash items in process of collection, noninterest bearing deposits due from other financial institutions (including corporate credit unions), and noninterest bearing balances with the Federal Reserve Banks, Federal Home Loan Banks and central banks.

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

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