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Securities - Amortized Cost and Fair Value, Available for Sale (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Cash and Cash Equivalents [Line Items] |  |
Amortized Cost | $ 1,276,871 | $ 1,264,529
Gross Unrealized Gains | 18,620 | 4,517
Gross Unrealized Losses | (4,878) | (18,269)
Fair Value | 1,290,613 | 1,250,777
U.S. Treasury securities |  |
Cash and Cash Equivalents [Line Items] |  |
Amortized Cost | 498 |
Gross Unrealized Gains | 1 |
Gross Unrealized Losses | 0 |
Fair Value | 499 |
Obligations of other U.S. Government agencies and corporations |  |
Cash and Cash Equivalents [Line Items] |  |
Amortized Cost | 2,518 | 2,536
Gross Unrealized Gains | 16 | 13
Gross Unrealized Losses | (3) | (38)
Fair Value | 2,531 | 2,511
Obligations of states and political subdivisions |  |
Cash and Cash Equivalents [Line Items] |  |
Amortized Cost | 218,362 | 200,798
Gross Unrealized Gains | 5,134 | 3,038
Gross Unrealized Losses | (365) | (567)
Fair Value | 223,131 | 203,269
Trust preferred securities |  |
Cash and Cash Equivalents [Line Items] |  |
Amortized Cost | 12,153 | 12,359
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (2,167) | (1,726)
Fair Value | 9,986 | 10,633
Other debt securities |  |
Cash and Cash Equivalents [Line Items] |  |
Amortized Cost | 55,364 | 44,046
Gross Unrealized Gains | 1,133 | 192
Gross Unrealized Losses | (132) | (311)
Fair Value | 56,365 | 43,927
Government agency mortgage backed securities | Residential mortgage backed securities |  |
Cash and Cash Equivalents [Line Items] |  |
Amortized Cost | 708,970 | 621,690
Gross Unrealized Gains | 8,951 | 719
Gross Unrealized Losses | (1,816) | (9,126)
Fair Value | 716,105 | 613,283
Government agency mortgage backed securities | Commercial mortgage backed securities |  |
Cash and Cash Equivalents [Line Items] |  |
Amortized Cost | 30,372 | 21,957
Gross Unrealized Gains | 659 | 257
Gross Unrealized Losses | (24) | (384)
Fair Value | 31,007 | 21,830
Government agency collateralized mortgage obligations | Residential mortgage backed securities |  |
Cash and Cash Equivalents [Line Items] |  |
Amortized Cost | 172,178 | 332,697
Gross Unrealized Gains | 1,322 | 274
Gross Unrealized Losses | (262) | (5,982)
Fair Value | 173,238 | 326,989
Government agency collateralized mortgage obligations | Commercial mortgage backed securities |  |
Cash and Cash Equivalents [Line Items] |  |
Amortized Cost | 76,456 | 28,446
Gross Unrealized Gains | 1,404 | 24
Gross Unrealized Losses | (109) | (135)
Fair Value | $ 77,751 | $ 28,335

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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27161-111563 + Details
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