Fair Value of Financial Instruments - Carrying Amount and Estimated Fair Value of Financial Instruments (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Financial assets
Cash and due from banks	$ 126,752	$ 316,823
Federal funds sold	96,787
Certificates of deposit with other banks	7,250	7,250
Investment securities, available-for-sale	540,045	380,490
Servicing assets	35,365	47,641	$ 52,298
Carrying Amount
Financial assets
Cash and due from banks	126,752	316,823
Federal funds sold	96,787
Certificates of deposit with other banks	7,250	7,250
Investment securities, available-for-sale	540,045	380,490
Loans held for sale	966,447	687,393
Loans and leases, net of allowance for loan and lease losses	2,599,052	1,810,985
Servicing assets	35,365	47,641
Mutual fund	2,206	2,099
Equity warrant assets	570	527
Financial liabilities
Deposits	4,229,122	3,149,583
Borrowings	14	1,457
Estimate of Fair Value Measurement
Financial assets
Cash and due from banks	126,752	316,823
Federal funds sold	96,787
Certificates of deposit with other banks	7,568	7,442
Investment securities, available-for-sale	540,045	380,490
Loans held for sale	1,020,567	695,154
Loans and leases, net of allowance for loan and lease losses	2,659,681	1,807,528
Servicing assets	35,365	47,641
Mutual fund	2,206	2,099
Equity warrant assets	570	527
Financial liabilities
Deposits	4,213,657	3,117,941
Borrowings	14	1,457
Level 1 \| Estimate of Fair Value Measurement
Financial assets
Cash and due from banks	126,752	316,823
Federal funds sold	96,787
Certificates of deposit with other banks	7,568	7,442
Level 2 \| Estimate of Fair Value Measurement
Financial assets
Investment securities, available-for-sale	539,953	380,490
Mutual fund	2,206	2,099
Financial liabilities
Deposits	4,213,657	3,117,941
Level 3 \| Estimate of Fair Value Measurement
Financial assets
Investment securities, available-for-sale	92
Loans held for sale	1,020,567	695,154
Loans and leases, net of allowance for loan and lease losses	2,659,681	1,807,528
Servicing assets	35,365	47,641
Equity warrant assets	570	527
Financial liabilities
Borrowings	$ 14	$ 1,457

Equity Warrant Assets, Fair Value Disclosure

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Mutual funds fair value disclosure.

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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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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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A savings certificate entitling the Entity (that is, bearer) to receive interest at an established maturity date, based upon a fixed interest rate. A certificate of deposit may be issued in any denomination. Certificates of deposit are generally issued by commercial banks and, therefore, insured by the FDIC (up to the prescribed limit). Certificates of deposit generally restrict holders from withdrawing funds on demand without the incurrence of penalties. Generally, only certificates of deposit with original maturities of three months or less qualify as cash equivalents. Original maturity means original maturity to the entity holding the investment. As a related example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three-years ago does not become a cash equivalent when its remaining maturity is three months.

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Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

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Fair value portion of deposit liabilities held by the entity, including, but not limited to, foreign and domestic, interest and noninterest bearing, demand deposits, saving deposits, negotiable orders of withdrawal (NOW) and time deposits.

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The amount outstanding of funds lent to other depository institutions, securities brokers, or securities dealers in the form of Federal Funds sold; for example, immediately available funds lent under agreements or contracts that mature in one business day or roll over under a continuing contract, regardless of the nature of the transaction or the collateral involved, excluding overnight lending for commercial and industrial purposes. Also include Federal Funds sold under agreements to resell on a gross basis, excluding (1) sales of term Federal Funds, (2) due bills representing purchases of securities or other assets by the reporting bank that have not yet been delivered and similar instruments, (3) resale agreements that mature in more than one business day involving assets other than securities, and (4) yield maintenance dollar repurchase agreements.

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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 portion of loan receivable, including, but not limited to, mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts.

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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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