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Fair Value Measurements - Fair Value of Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Financial assets:
Securities available for sale, at fair value	$ 1,343,457	$ 1,290,613
Derivative instruments	3,866	61
Financial liabilities:
Derivative instruments	21,107	9,974
Trust preferred securities
Financial assets:
Securities available for sale, at fair value	9,012	9,986
Other debt securities
Financial assets:
Securities available for sale, at fair value	65,607	56,365
Recurring
Financial assets:
Securities available for sale, at fair value	1,343,457	1,290,613
Derivative instruments	33,574	8,498
Mortgage loans held for sale in loans held for sale	417,771	318,272
Total financial assets	1,794,802	1,617,383
Financial liabilities:
Derivative instruments	21,107	10,000
Recurring | Trust preferred securities
Financial assets:
Securities available for sale, at fair value	9,012	9,986
Recurring | Other debt securities
Financial assets:
Securities available for sale, at fair value	1,334,445	1,280,627
Recurring | Level 1
Financial assets:
Securities available for sale, at fair value	0	0
Derivative instruments	0	0
Mortgage loans held for sale in loans held for sale	0	0
Total financial assets	0	0
Financial liabilities:
Derivative instruments	0	0
Recurring | Level 1 | Trust preferred securities
Financial assets:
Securities available for sale, at fair value	0	0
Recurring | Level 1 | Other debt securities
Financial assets:
Securities available for sale, at fair value	0	0
Recurring | Level 2
Financial assets:
Securities available for sale, at fair value	1,334,445	1,280,627
Derivative instruments	33,574	8,498
Mortgage loans held for sale in loans held for sale	417,771	318,272
Total financial assets	1,785,790	1,607,397
Financial liabilities:
Derivative instruments	21,107	10,000
Recurring | Level 2 | Trust preferred securities
Financial assets:
Securities available for sale, at fair value	0	0
Recurring | Level 2 | Other debt securities
Financial assets:
Securities available for sale, at fair value	1,334,445	1,280,627
Recurring | Level 3
Financial assets:
Securities available for sale, at fair value	9,012	9,986
Derivative instruments	0	0
Mortgage loans held for sale in loans held for sale	0	0
Total financial assets	9,012	9,986
Financial liabilities:
Derivative instruments	0	0
Recurring | Level 3 | Trust preferred securities
Financial assets:
Securities available for sale, at fair value	9,012	9,986
Recurring | Level 3 | Other debt securities
Financial assets:
Securities available for sale, at fair value	$ 0	$ 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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